Holley Terminator Stealth EFI User manual

1
550-442 EFI Throttle Body w/ GM Trans Control - Polished
550-443 EFI Throttle Body w/ GM Trans Control –Hard Core Gray
550-445 EFI Throttle Body w/ GM Trans Control –Classic Gold Finish
FUEL INJECTION INSTALLATION MANUAL
Read this manual before using this product.
WARNING!
This instruction manual must be read and fully understood before beginning installation. If the instructions are not fully
understood, installation should not be attempted. Failure to follow the instructions may result in subsequent system failure and
could result in serious personal injury and/or property damage. Keep this manual.
For the safety and protection of you and others as well as your vehicle, only a trained mechanic having adequate fuel system
experience should perform the installation, adjustment, and repair.
While undertaking any work involving the fuel system, it is particularly important to remember one of the very basic principles of
safety: fuel vapors are heavier than air and tend to collect in low places where an explosive fuel/air mixture may be ignited by
any spark or flame resulting in property damage, personal injury, and/or death. Extreme caution must be exercised to prevent
spillage and thus eliminate the formation of such fuel vapors. All work involving this product and the fuel system generally
MUST be performed in a well-ventilated area. Do NOT smoke or have an open flame present near gasoline vapors or an
explosion may result.
Any components damaged due to failure to follow these instructions will not be covered by the warranty. Failure of any one
component does not constitute, nor does it justify, warranty of the complete system. Individual service items are available for
replacement of components. If assistance is required or if you need further warranty clarification, please call Holley Technical
Service at 1 [phone] or [phone].

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TABLE OF CONTENTS:
1.0 INTRODUCTION & SYSTEM REQUIREMENTS .....................................................................................................................3
1.1 Engine Requirements............................................................................................................................................................3
1.2 Fuel System Requirements...................................................................................................................................................3
2.0 PARTS IDENTIFICATION........................................................................................................................................................4
3.0 TOOLS REQUIRED FOR INSTALLATION ..............................................................................................................................6
4.0 OXYGEN SENSOR INSTALLATION........................................................................................................................................6
5.0 COOLANT TEMPERATURE SENSOR INSTALLATION..........................................................................................................7
6.0 THROTTLE BODY & CABLE BRACKET INSTALLATION.......................................................................................................8
6.1 Throttle Connections ............................................................................................................................................................8
6.2 Vacuum Line Connections ...................................................................................................................................................9
7.0 FUEL SYSTEM ........................................................................................................................................................................9
8.0 ECU MOUNTING AND WIRING OVERVIEW..........................................................................................................................9
9.0 WIRING HARNESS INSTALLATION.......................................................................................................................................9
9.1 Harness Routing..................................................................................................................................................................10
9.2 Sensor Connections & Loose Wires ...................................................................................................................................11
10.0 IGNITION WIRING...............................................................................................................................................................12
11.0 ADDITIONAL OUTPUTS......................................................................................................................................................15
12.0 TRANSMISSION WIRING....................................................................................................................................................16
13.0 PREVIOUS INSTALLATION REQUIRED.............................................................................................................................17
14.0 TERMINATOR™ INSTRUCTIONS AND TUNING ...............................................................................................................17
15.0 INITIAL POWER-UP............................................................................................................................................................17
16.0 HANDHELD NAVIGATION & USE.......................................................................................................................................18
16.1 Making Adjustments..........................................................................................................................................................18
17.0 HOME SCREEN...................................................................................................................................................................18
18.0 CALIBRATION WIZARD......................................................................................................................................................18
19.0 TPS AUTOSET ....................................................................................................................................................................20
20.0 TRANSMISSION SETUP.....................................................................................................................................................21
20.1 Transmission....................................................................................................................................................................21
20.1.1 Trans Setup ...............................................................................................................................................................21
20.1.2 Speed Calc ................................................................................................................................................................21
21.0 SENSOR VERIFICATION....................................................................................................................................................22
22.0 STARTUP.............................................................................................................................................................................22
23.0 SETTING IGNITION TIMING................................................................................................................................................23
24.0 AFTER-STARTUP................................................................................................................................................................23
25.0 IDLE SETTING/THROTTLE PLATE SETTING ....................................................................................................................23
26.0 SELF-TUNING .....................................................................................................................................................................24
27.0 GAUGE SCREENS..............................................................................................................................................................24
27.1 Monitor .............................................................................................................................................................................24
27.1.1 Multi-Gauge ...............................................................................................................................................................25
27.1.2 Monitors .....................................................................................................................................................................25
27.1.3 Diagnostics ................................................................................................................................................................26
28.0 Custom Setups.....................................................................................................................................................................26
28.1 Dash Setup.......................................................................................................................................................................26
28.2 Channels Scaling .............................................................................................................................................................27
29.0 FILE SAVING/LOADING......................................................................................................................................................27
29.1 File.....................................................................................................................................................................................27
29.1.1 ECU Overview............................................................................................................................................................28
29.1.2 ECU Globals ..............................................................................................................................................................28
29.1.3 ECU Data Logging.....................................................................................................................................................29
29.1.4 ECU Hardware/Firmware (HW/FW)...........................................................................................................................29
29.1.5 Local Setup................................................................................................................................................................29
30.0 BASIC TUNING....................................................................................................................................................................30
30.1 Basic Fuel.........................................................................................................................................................................31
30.1.1 Target AFR ................................................................................................................................................................31
30.1.2 Acceleration Enrichment............................................................................................................................................31
30.1.3 Fuel Prime..................................................................................................................................................................32
30.2 Fuel Learn ........................................................................................................................................................................32
30.2.1 Learn Enable/Disable.................................................................................................................................................32
30.2.2 Learn Speed ..............................................................................................................................................................33
30.3 Basic Idle..........................................................................................................................................................................33
30.4 Spark................................................................................................................................................................................34
30.5 Transmission.....................................................................................................................................................................34
30.5.1 Shifts..........................................................................................................................................................................34
30.5.2 WOT Shifts ................................................................................................................................................................35
30.5.3 Torque Converter Clutch (TCC) Parameters .............................................................................................................36
30.5.4 Torque Converter Clutch (TCC) (Un) Lock ................................................................................................................36
30.5.5 Line Pressure.............................................................................................................................................................37
31.0 SYSTEM SETUP..................................................................................................................................................................37

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31.1 System Tuning .................................................................................................................................................................37
31.1.1 Outputs ......................................................................................................................................................................38
31.1.2 Engine Setup .............................................................................................................................................................38
31.1.3 Ignition Setup.............................................................................................................................................................39
32.0 ADVANCED TUNING...........................................................................................................................................................40
32.1 Advanced Fuel .................................................................................................................................................................40
32.2 Closed Loop .....................................................................................................................................................................40
32.3 Advanced Learn ...............................................................................................................................................................41
32.3 Advanced Idle...................................................................................................................................................................42
32.3.1 IAC Rampdown..........................................................................................................................................................42
32.3.2 IAC Speed..................................................................................................................................................................43
32.3.3 IAC Startup ................................................................................................................................................................43
32.3.4 Idle Spark...................................................................................................................................................................44
APPENDIX 2.0 SENSOR DIAGNOSTICS AND STATUSES........................................................................................................45
1.0 INTRODUCTION & SYSTEM REQUIREMENTS
Holley Performance Products has written this manual for the installation of the STEALTH TERMINATOR™ EFI TBI fuel injection system.
This manual contains the information necessary for the installation of this kit. It also contains all tuning information. Please read all the
WARNINGS and NOTES, as they contain valuable information that can save you time and money. It is our intent to provide the best
possible products for our customer; products that perform properly and satisfy your expectations.
1.1 Engine Requirements
Before moving forward with the installation, please verify your vehicle meets the engine and fuel system requirements below:
Engine is a naturally aspirated (no supercharger, turbocharger, etc.) V8
Engine horsepower is between 250 –600
Engine has a 4 BBL, 4150 style square flange or universal flanged spread bore intake manifold*
Unleaded fuel only
Any RTV silicone sealants used on the engine are sensor safe
* Any square flange Holley type intake manifold will work. A spread bore intake manifold may work with no adapter as long as it is an aftermarket
“universal flange” (meaning it has dual bolt patterns), and as long as it has enough material such that no vacuum leaks occur along the perimeter of the
throttle body. If there is not enough material, a sealing plate (Weiand® PN 9006) can be used. Factory dual plane intakes will require an adapter (PN
17-6).
NOTE: The STEALTH TERMINATOR™ system requires the use of the supplied 5/16” thick gasket to provide proper clearance.
1.2 Fuel System Requirements
A complete high pressure EFI fuel system must be installed for the STEALTH TERMINATOR™. The pump should be capable of
supplying 255 liters/hour or 400 lb./hr. of fuel at 45 PSI. If using an in-line fuel pump, there should be a coarse pre-filter before the pump.
All systems should contain a 10 micron post filter after the fuel pump. An EFI fuel pressure regulator is required. See Figure 1 below for
an example when utilizing a bypass regulator.
Holley offers four fuel system kits. These kits contain all components except the return line. They include detailed instructions
(downloadable at www.holley.com). These kits are:
526-1 –Perform-O-Flex Stainless Hose, Billet Pump, Regulator, and Filters
526-2 –Pro-Lite 350 Hose, Billet Pump, Regulator, and Filters
526-3 –Super Stock Hose, Billet Regulator, 12-920 Fuel Pump, and Filters
526-4 –Super Stock Hose, Billet Regulator, 12-920 Fuel Pump, and Metal Filters

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Figure 1
2.0 PARTS IDENTIFICATION
ITEM
NUMBER
IMAGE
DESCRIPTION
QTY
SERVICE PART
NUMBER
NOTES
1
Bosch Wide Band
Oxygen Sensor
1
554-101
Use of leaded fuel will degrade sensor. Prolonged
use will require periodic replacement.
Mounting procedure below is critical for system
performance
2a
Clamp-on Oxygen
Sensor Bung
(Optional)
1
Varies per Size
(see page 7)
Requires 3/4” hole to be drilled
2b
Oxygen Sensor
Weld Ring
534-49
Requires 7/8” hole to be drilled
Welding should be performed by competent welder
or exhaust shop
3
Coolant
Temperature
Sensor
1
534-10
3/8” NPT Threads – Adapters to ½” NPT are
available
Must be installed in a coolant passage in either the
intake manifold or cylinder head. Do not install in
thermostat housing.
4
STEALTH
TERMINATOR™
EFI Throttle Bodies
1
534-225 (Polished)
534-226
(Hard Core Gray™)
534-229 (Classic
Gold)
All Without
Harnesses
4150 style mounting flange
Includes injectors, MAP sensor, TPS, IAT sensor,
and IAC
5
Air Cleaner Gasket
1
108-4
Hardware and gaskets for mounting throttle body to
intake manifold
Should be tightened down progressively in a criss-
cross pattern to 5-7ft./lbs. Overtightening will
damage throttle body!
6
5/16-24 Nuts
4
N/A
7
Washers
4
N/A
8
Flange Gasket
1
108-12
9
Manifold Flange
Studs
4
N/A

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10
TERMINATOR™
EFI Electronic
Control Unit (ECU)
1
554-114
ECU can be mounted inside passenger
compartment or in engine compartment if
precautions in the installation section are followed
Do NOT remove plastic shoulders on mounting
ears of ECU
11
3.5” Touch Screen
Controller
1
553-108
Includes harness to connect directly to CAN
connector
12
Main Power
Harness
1
558-308
Must be connected DIRECTLY to the battery, no
exceptions
Do not connect to ECU until ALL wiring and
installation is performed
13
TERMINATOR™
EFI Main Wiring
Harness
1
558-414
Connectors are labeled to simplify installation
If ECU is mounted in passenger compartment, be
sure to use grommet (included) where harness
passes through firewall
14
Grommet
1
N/A
Used to route Main Harness through firewall
Requires 2” hole to be drilled using a hole saw
15
Output Harness
1
558-420
Mates to Input/Output connector on Main Wiring
Harness and can be used for A/C Shutdown,
Electric Fan #1 Output, and/or Electric Fan #2
Output.
16
Ignition Adapter
1
558-302
This is only used on applications using a CD box
such as an MSD 6AL, when timing control is not
desired
This plugs in to the connector labeled “IGNITION”
and the loose yellow/black wire connects to the
“Tach Out” connection on the ignition box
Never connect this wire directly to the ignition coil!
17
Throttle Bracket,
Throttle Only
1
20-151
18
1/4-20 x 5/8 Socket
Head Cap Screw
1
N/A
Used to secure throttle cable bracket to throttle
body with a lock washer (Item 24)
19
Throttle and Cruise
Control Stud
1
20-36
Used for various throttle and/or transmission
combinations

20
Throttle Lever Ball
1
20-2
Used for various throttle and/or transmission
combinations
21
Throttle Lever Stud
1
20-37
22
Transmission
Kickdown Stud
1
20-40
23
Lock Washers
3
N/A
24
1/4-28 Nuts
2
N/A
25
Stealth Terminator
Fuel Line
Assembly
1
534-247
26
Transmission
Harness
1
558-405

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Throttle Body Service Parts: QTY P/N
STEALTH TERMINATOR™ Sub-Harness 1 558-441
Intake Air Temperature (IAT) Sensor 1 554-121
Terminator 80PPH Fuel Injector (requires purchase of 4) 1 522-801
Manifold Absolute Pressure (MAP) Sensor 1 554-120
Idle Air Control (IAC) Motor 1 543-105
Throttle Position Sensor (TPS) 1 9920-110
40 AMP Relay 1 534-26
Transmission Harness 1 558-405
Optional Parts:
Small Cap GM HEI Ignition Adapter 1 558-304
Ford TFI Ignition Adapter 1 558-305
Ford Transmission Kickdown Bracket Kit 1 20-152
0-100 PSI Pressure Transducer (1/8” NPT; for monitoring fuel pressure) 1 554-102
3.0 TOOLS REQUIRED FOR INSTALLATION
Standard wrench set Small blade screwdriver Allen Wrench set
Medium blade screwdriver #2 Phillips screwdriver Digital Volt meter
Drill and assorted bit sizes Hole saw (2”) (depending on ECU location) Terminal crimping tool
Factory Service Manual for your vehicle O2 Bung Installation (drilling, welding)
An assistant is necessary for some installation and adjustment procedures and should be present for safety reasons.
WARNING! Disconnect battery before proceeding with any installation.
4.0 OXYGEN SENSOR INSTALLATION
IMPORTANT! Position and support your vehicle on a suitable surface. USE CAUTION AND WORK ONLY ON A LEVEL SURFACE
USING JACKS AND JACK STANDS OF SUFFICIENT CAPACITY TO LIFT AND SUPPORT YOUR VEHICLE. NEVER
WORK UNDER A VEHICLE SUPPORTED BY A FLOOR OR BUMPER JACK. Use of a two-post under arm lift or four-
post drive-on lift will considerably reduce the time and effort required to complete the installation. MAKE SURE LIFT
LOCKS ARE ENGAGED BEFORE WORKING UNDER THE VEHICLE.
OXYGEN SENSOR WELD RING INSTALLATION (Recommended):
WARNING! Failure to disconnect the AIR pump or locating the oxygen sensor downstream from AIR injection will result in an extremely
rich mixture, which could cause drivability problems and severe engine damage. If disconnecting AIR pump, check with local
ordinances for the legality of this procedure in your area.
1. Locate a position for the oxygen sensor as close to the engine as possible. The oxygen sensor should be mounted at a point where it
can read a good average of all the cylinders on one bank. This would be slightly after all the cylinders merge. If you have long tube
headers, mount the sensor approximately 1-10” after the collector. You must have at least 18” of exhaust pipe after the sensor. If
your vehicle has catalytic converters, the oxygen sensor MUST be located between the engine and the catalytic converters.
2. Ensure the location for the sensor is at the angle in Figure 2. This will help prevent condensation in the exhaust tubing from entering
the sensor. The sensor can be mounted on either side of the tubing.
3. Drill a 7/8” hole in the intended location for the sensor. Weld the Oxygen Sensor Weld Ring (Item 2b) into the 7/8” hole. Weld all
the way around the boss to insure a leak proof connection. Install the Oxygen Sensor (Item 1) into the weld ring and tighten
securely. It is a good idea to add anti-seize to the threads to aid in removal. Do not get any anti-seize on the tip of the sensor.
NOTE: Never run the engine with the oxygen sensor installed if it is not plugged in and powered by the ECU, or it will be damaged. If
you need to plug the hole temporarily, use an O2 sensor plug or a spark plug with an 18mm thread.
CLAMP-ON OXYGEN SENSOR BUNG INSTALLATION (Optional):
WARNING!
Failure to disconnect the AIR pump or locating the oxygen sensor downstream from AIR injection will result in an extremely rich mixture,
which could cause drivability problems and severe engine damage. If disconnecting AIR pump, check with local ordinances for the legality
of this procedure in your area.
Your vehicle may already have an O2 sensor bung welded into the exhaust. This bung location needs to be verified before using it with
the Oxygen sensor included in the Sniper EFI system. Ideally, the bung will be 6-10 inches after the collector for a true reading of all
cylinders and have a minimum of 18” length past the sensor location. If the vehicle is equipped with a catalytic converter, the bung must
be between the engine and the catalytic converter. The bung also must be on the top side of the tube so moisture cannot collect on the
oxygen sensor. If there is an acceptable bung already present, go ahead and tighten the oxygen sensor supplied with your Sniper EFI in

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the bung. If there is not an acceptable bung already in the exhaust, please plug all poorly placed bungs and follow the following
instructions for the included Clamp-On O2 bung.
If needed, Hooker Blackheart offers different diameter Clamp-On O2 Bung kits:
2.25” Diameter: 71014303-RHKR
2.5” Diameter: 71014302-RHKR
3.0” Diameter: 71014301-RHKR
1. Locate a place in the exhaust to drill a 3/4" hole. Make sure to allow enough clearance for an O2 sensor and wiring harness. It is
important to keep the O2 bung (Item 2a) at least 12 inches from open exhaust. Ensure the location for the sensor is at an angle
(Figure 2). This will help prevent condensation in the exhaust tubing from entering the sensor. The sensor can be mounted on either
side of the tubing.
Figure 2
2. Mark the center of the casting on the exhaust tube and drill a 3/4" hole. Deburr the hole after drilling (Figure 3).
Figure 3 Figure 4
3. Place the gasket on the tube, then the casting on the tube. Slip a clamp on one side and lightly tighten. Slip the second clamp on
and lightly tighten.
Figure 5 Figure 6
4. Verify the center of the casting is in the center of the hole and tighten clamps.
5. Install the O2 sensor in the bung. Lightly tighten with a wrench.
Figure 7
5.0 COOLANT TEMPERATURE SENSOR INSTALLATION
1. Install the Coolant Temperature Sensor (Item 3) into a 3/8” NPT coolant passage in either the intake manifold or cylinder head. Do
not overtighten or damage to the cylinder head or intake may occur. It is best to drain the some of the coolant before the sensor is
installed. Use thread sealer or a small amount of thread tape. Do not install the sensor in the thermostat housing, or in an area that
will not see a constant flow of coolant.

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6.0 THROTTLE BODY & CABLE BRACKET INSTALLATION
1. Disconnect the battery and remove the air cleaner.
2. Before disconnecting any vacuum hoses, it is a good idea to sketch out the vacuum hose routing. Using masking tape and a
permanent marker, mark all the vacuum hoses, vacuum sources, and ports before removing the old fuel delivery system.
3. Remove and discard the fuel line that connects to the carburetor from the mechanical fuel pump. This will not be needed in the
installation. Remove the throttle return springs and keep for later installation.
4. Remove carburetor (if applicable) and clean mounting flange ensuring no debris falls into intake manifold.
5. Install the four Manifold Flange Studs (Item 9) into the intake manifold. Install the Flange Gasket (Item 8) between the manifold
and the STEALTH TERMINATOR™. Check for sufficient thread engagement of the throttle body hold down studs and nuts.
DANGER! Check for proper clearance between engine components, such as the distributor, coil, etc., and the throttle body.
Also check for clearance between the air cleaner and hood. If any interference is found, correct the condition before
continuing. Failure to do so can result in damage to the engine components, throttle body, or hood.
6. Position the STEALTH TERMINATOR™ Throttle Body Assembly (Item 4) over the manifold flange studs with the throttle lever
located on the driver’s side.
7. Place the Throttle Bracket (Item 17) for your application over the rear driver’s side stud and use ¼-20 x 5/8 SHCS (Item 18) and a
Lockwasher (Item 23) to secure.
8. Using the supplied 5/16-24 Nuts and Washers (Items 6 & 7), tighten the throttle body down in a criss-cross pattern. Proper torque is
5-7 ft./lbs. DO NOT OVERTIGHTEN!
6.1 Throttle Connections
1. The throttle body is designed to provide the proper cable geometry for TH350, TH200R, and TH700R4 transmissions as shown in
Figure 8. Install the Throttle and Transmission Studs (Items 19, 20, 21, and/or 22)for your application in their dedicated holes and
secure each with a Lock Washer (Item 23) and 1/4-28 Nut (Item 24).
Figure 8
2. Once the throttle linkage is attached, have an assistant get in the vehicle and fully actuate the throttle controls. Make the necessary
adjustments to the throttle linkage to ensure that the throttle plates are vertical when the throttle control is wide open. Work the
throttle linkage back and forth several times to ensure it operates smoothly with no binding or sticking.
DANGER! A sticking throttle may result in uncontrolled engine or vehicle speed. This could cause property damage, personal
injury, or death. A sticking throttle may be caused by improperly installed throttle cables, lack of clearance for any of
the throttle linkage, or by a binding throttle linkage. Check all throttle cables for proper installation and alignment.
Actuate the throttle to check for any potential binding or clearance problems. Repair any problems before continuing.
3. If the vehicle is equipped with an automatic transmission, ensure that the transmission kickdown is properly adjusted. Follow the
vehicle manufacturer’s procedure for the correct adjustment procedure.
NOTE: On late model GM and Ford overdrive transmissions with a lockup torque converter, make sure the lockup function is properly
retained. Failure to do so will result in premature transmission failure.
NOTE: On Chrysler vehicles, a lever extension will be needed, Holley PN 20-7. Van applications may require the use of throttle lever
extension Holley PN 20-14.
4. Install external throttle return springs that you previously removed from the carburetor. External springs should be used in addition to
the springs on the throttle body itself. Have an assistant get in the vehicle and fully depress the accelerator pedal. Make the
necessary adjustments to the throttle linkage to insure that the throttle reaches wide-open position when the accelerator is depressed.
Work throttle linkage back and forth several times to ensure that it operates smoothly with no binding or sticking.
DANGER! Failure to attach the throttle return spring or a sticking throttle may result in uncontrolled engine or vehicle speed,
which could cause personal property damage, serious injury, or death.

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6.2 Vacuum Line Connections
1. Connect the vacuum lines that were previously disconnected. Figures 9 & 10 show the function of the ports in the STEALTH
TERMINATOR™ throttle body.
Figure 9 Figure 10
7.0 FUEL SYSTEM
Connect the fuel system per the manufacturer’s instructions.
8.0 ECU MOUNTING AND WIRING OVERVIEW
The Terminator™ EFI ECU (Item 10) can be mounted inside the passenger compartment (preferable location) or in the engine
compartment. If mounted in the engine compartment, follow these guidelines:
The ECU should be located such that it isn’t being directly hit by water or road debris.
It should also be located such that it isn’t extremely close to exhaust manifolds or headers.
It should be mounted such that it is as far away from spark plug wires, CD ignition boxes, or other “electrically noisy” devices as
is reasonable possible.
Make sure the connector end of the ECU is pointed DOWN such that water can’t make its way into the ECU terminals.
The ECU comes with mounting hardware (stainless steel screws and nuts). The ECU has plastic shoulders on the mounting ears. DO
NOT REMOVE THEM. Do not over-tighten the mounting hardware if the ECU is not mounted on a flat surface.
EFI systems depends heavily on a clean and constant voltage source. ALL grounds of an electrical system are just as important as the
power side.
TERMINATOR™ ECU’s contain multiple processing devices that require clean power and ground sources. Wiring harnesses must be
installed in such a manner that they are separated from “dirty” power and ground sources.
DO’S
Install the main power and ground directly to the battery. To the POSTS/TERMINALS, not to any other place.
Keep sensor wiring away from high voltage or “noisy/dirty” components and wiring, especially secondary ignition wiring (plug
wires), ignition boxes and associated wiring. It is best that the plug wires not physically contact any EFI wires.
Properly crimp or crimp and solder any wire connections. Apply quality heat shrink over any of these connections.
Ensure that the engine is properly grounded to the negative battery post/terminal, as well as chassis.
DON’TS
NEVER run high voltage or “noisy/dirty” wires in parallel (bundle/loom together) with any EFI sensor wiring. If wires need to
cross, try to do so at an angle.
Don’t use the electric fan outputs to directly power a fan. They must only trigger a relay.
Don’t use improper crimping tools.
Don’t use things like “t-taps”, etc. Use proper crimpers/solder and heat shrink.
It is never recommended to splice/share signal wires (such as TPS, etc.) between different electronic control units (i.e.
“piggyback”).
Don’t connect the red/white switched +12V wire to “dirty” sources, such as the ignition coil, audio systems, or 12V sources
connected to HID head lamps.
NEVER start an engine with a battery charger attached
9.0 WIRING HARNESS INSTALLATION
The STEALTH TERMINATOR™ throttle body comes with sensors pre-wired for easy installation. The illustrated diagram below (Figure
11) is intended as an overview of how the system should be wired. Remember, the main ECU power and ground must be connected
directly to the battery post/terminal AFTER all other wiring installation has been performed. Do not attach the loose white or yellow wires,
or ignition connector until you have referred to section 10.0 (Ignition Wiring).

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Figure 11
9.1 Harness Routing
If the ECU is mounted in the interior, the harness will have to be routed through the firewall into the engine compartment. Use a 2” hole
saw to create a hole in a desired location if no other point of access is available. A Grommet (Item 14) is supplied for a 2” hole to seal
this area.
If the ECU is mounted in the engine compartment, the hand-held tuning module cable will have to be routed to the “CAN” connector on the
main harness (located near the ECU connector main connector). This is assuming you want to access the hand-held module after
startup. This will require routing the small CAN connector somewhere through the firewall.
Connect the P1A and P1B connectors of the main harness into the ECU.
About 18” from the ECU main connectors is a 40A Relay. This powers the injectors and fuel pump. There is also a 20 amp fuse for the
injectors and fuel pump pre-installed in this location.

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9.2 Sensor Connections & Loose Wires
At this time, connect the Bulkhead, CTS, WBO2, CAN, and Fuel (for optional fuel pressure transducer P/N 554-102) connectors to their
dedicated sensors/connectors in the diagram on page 8.
The loose wires shown in Figure 12 should be connected as follows on all systems. These wires come out of the harness about 40” from
the ECU connectors except for the “12V Switched” wire (approximately 7”).
Figure 12
Red/White Wire = 12V Switched
Should be connected to a clean +12 volt switched power source. Switched power source should only be active when the ignition is on.
Ensure switched power source has power when engine is cranking as well (check with voltmeter). Not all sources apply power when the
ignition switch is in “cranking” position. This wire is located approximately 7” from the ECU connectors. DO NOT connect to a “DIRTY”
source like an ignition coil!
Red Wire = 12V Battery
Should be connected directly to the battery. This powers the fuel pump and fuel injectors. This wire is protected by a fuse in a sealed
fuse holder. The fuse holder is located about 18” from the ECU connector. A fuse is pre-installed (20A).
Green Wire = 12V Fuel Pump
Used to directly power a fuel pump (+12 volt). Do not use this wire to power fuel pumps that require over 15 Amps. For high current
pumps, use this wire to trigger a separate relay and use larger gauge wire to supply voltage to the pump - 10 gauge is recommended.
The pump included with some STEALTH TERMINATOR™ systems draws less than 10 Amps and can be powered directly by this wire.
The fuel pump also requires a ground wire. Run a wire from the negative side of the fuel pump. Connect it to a solid chassis/frame
ground.
White Wire = Points Output
Used for ignition configurations that must be configured with a laptop computer. See pages 13-21 in the Holley EFI Wiring Manual,
located at http://documents.holley.com/techlibrary199r10555rev17.pdf or go to www.holley.com, click on SUPPORT, then TECH
SERVICE, scroll down and click Resource Documents & Library. Go to the Fuel Injection tab and scroll down to the Holley EFI Wiring
Manual.
Black Wire = Chassis Ground
Connect to a chassis ground point that has excellent connectivity with both the engine and battery. This ground should not be connected
at the same location as other grounds. It is also important that you have a sufficient ground strap from the engine block to the chassis.
Yellow Wire = “Coil –”
See section 10.0 below. This is an RPM input wire used for some applications.

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10.0 IGNITION WIRING
The most important signal for the ECU is the Engine Speed input. It is critical that this is configured and wired correctly or poor
performance will result. Pay close attention to the options below or ECU damage could result! It is very important that any aftermarket
distributors with a rev limiter verification feature
OPTION 1: “Coil -”engine speed input –Use this if:
You are using a stock type mechanical advance distributor with a stock inductive ignition coil. Examples of this would be any
older style points distributor, a 1974-1981 GM large cap HEI.
Do NOT use this input if you are using an aftermarket Capacitive Discharge (CD) ignition system such as a MSD, Mallory, or
others. The ECU will be damaged if you connect to a capacitive discharge type ignition coil.
NOTE: When using this input, the EFI will NOT control the ignition timing of the engine. The timing will be based on the distributor initial,
mechanical, and vacuum advance, just like it did with a carburetor.
OPTION 1 WIRING:
OR

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OPTION 2: “Tach Out” engine speed input -
If you are using an aftermarket Capacitive Discharge (CD) ignition system such as a MSD, Accel, or others, you need to connect
to the “Tach Out” connection or wire these systems provide. This is a 12 volt square wave output.
CAUTION! NEVER, NEVER connect any of the EFI wires to the coil on any CD type ignition system. The ECU will be permanently
damaged!
NOTE: When using this input, the EFI will NOT control the ignition timing of the engine. The timing will be based on the distributor initial,
mechanical, and vacuum advance, just like it did with a carburetor.
OPTION 2 WIRING:
OPTION 3:“GM Small Cap HEI” Computer Controlled Distributor (Requires Holley Ignition Adapter PN 558-304) –
Small and Big Block Chevy engines can use a small cap GM HEI computer controlled distributor that was available on factory GM
vehicles from the 1980’s through mid-1990’s. This distributor is also available through MSD under part number 8366. The
distributor (shown below) provides an engine speed signal to the EFI, as well as allowing the EFI to control the ignition timing.
OPTION 3 WIRING:

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OPTION 3 WIRING W/ CAPACITIVE DISCHARGE BOX (Such as MSD 6AL)
OPTION 4: “Ford TFI” Computer Controlled Distributor (Requires Holley Ignition Adapter PN 558-305) –
Ford Sequentially Injected 5.0-5.8L engines from 1987-1995 used this distributor. This option will allow the EFI to control the
ignition timing.
OPTION 4 WIRING:

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OPTION 4 WIRING W/ CAPACITIVE DISCHARGE BOX (Such as MSD 6AL)
11.0 ADDITIONAL OUTPUTS
There are 3 optional outputs available on the system that can be used for the following features:
Air Conditioning Shutdown at wide open throttle
Electric Fan #1 output
Electric Fan #2 output
Three outputs are located in the “Input/Output” connector. This is a 3 Pin connector is located about 52 inches from the ECU. A mating
harness is included with the system.
The following indicates proper wiring for these features.
A/C Shutdown –This output will provide a +12 volt output at a defined throttle position. This output can be used to trigger a relay that
deactivates the A/C at higher throttle positions. This may require the installation of a 5 pole relay in the existing A/C wiring. This wire is
located in pin A of the 3 pin Input/Output connector and is Gray with a Yellow stripe.
Electric Fan #1 output –This output will provide a ground output to trigger a relay used for a cooling fan. This output should never be
directly connected to a fan, but the relay that powers the fan. It should be connected to the ground trigger of the relay. This wire is
located in pin B of the 3 pin Input/Output connector and is Gray with a Black stripe.
Electric Fan #2 output –This output will provide a ground output to trigger a relay used for a cooling fan. This output should never be
directly connected to a fan, but the relay that powers the fan. It should be connected to the ground trigger of the relay. This wire is
located in pin C of the 3 pin Input/Output connector and is Gray with a Green stripe.

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12.0 TRANSMISSION WIRING
The transmission harness can be used on 4L60E, 4L65E, 4L70E, 4L80E, and 4L85E transmissions. Each connector should be labeled.
Transmission ECU Connector (P4) –Plugs into the ECU. Plugs into the last connector opposite the main harness.
Main Transmission Connector –Simply plugs into the connector on the transmission. Located on the driver’s side of a 4L80E (installed
horizontally) and the passenger side on a 4L60E (installed vertically).
Vehicle Speed Sensor (VSS)/Transmission Output Speed Sensor (OSS) –Located on the rear drivers side on a 4L80E and the rear
passengers side on a 4L60E
Turbine Speed Sensor –The 4L60E does not have a turbine speed sensor. It is located towards the front driver’s side on a 4L80E. Note
that a 4L70E has one internally wired, but is not connected to the Holley harness. The turbine speed sensor is not used for any
calculations in the ECU, just for monitoring purposes.
Brake Switch (Grey) –Wired to the brake light switch. This must be installed to a +12v source (as most brake light switches are). This
input is used to unlock the torque converter when the brakes are applied.
Ground (Black) –Connect to a good chassis/engine ground source
Switched Power (Red w/ White) –This is used to power the relay for the trans solenoids, it should be connected to a +12v power source.
Transmission Power (Solid Red) –Supplies power to the transmission solenoids. This should be connected to a +12v power source
capable of supplying 5 amps.
NOTE: The power supplying the Transmission Power (solid red) wire must NOT be tied to the same point that the ECU switched power
wire (red/white wire) is connected to. If they are tied together, the transmission power could back-feed power to the ECU and the
ECU/engine will not shut off when the key is turned off.
Main Transmission Connector
Vehicle Speed Sensor Turbine Speed Sensor
Transmission ECU Connector Loose Wire Bundle

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13.0 PREVIOUS INSTALLATION REQUIRED
At this point, the installation of your EFI system should be 100 percent complete. The ECU, TERMINATOR™ Handheld controller, throttle
body and intake hardware, all sensors, wiring, fuel pump, regulator and return line, and all other hardware should be installed. The vehicle
should be ready to start and run. If this is not the case, refer to the hardware installation manual included with your particular system.
14.0 TERMINATOR™ INSTRUCTIONS AND TUNING
The TERMINATOR™ EFI systems are designed to be easy to use for the first time EFI tuner. The instructions are set up in that manner
as well. These instructions will not get into detail about EFI theory and operation. They will provide the steps necessary to get you up and
running quickly. The TERMINATOR™ system allows for the user to perform some basic changes to the tuning if they desire to do so.
The instructions are sequenced to get you up and running so you can enjoy your vehicle, then review some of the parameters that can be
adjusted to fine tune your vehicle at a later time if desired. FOR ADVANCED TUNING INFORMATION PLEASE GO TO
http://documents.holley.com/techlibrary_199r10751.pdf
15.0 INITIAL POWER-UP
Turn the ignition key to the “run” position. This should apply power to the ECU as well as the TERMINATOR™ Handheld control module.
The handheld should power up and the Home Screen (Figure 13) should appear.
The Home screen contains icons which will navigate to different functional features of the 3.5 Touch Screen. These features will be
discussed in detail throughout this manual.
Figure 13 –Home Screen
NOTE: DO NOT ATTEMPT TO START THE VEHICLE UNTIL YOU ARE TOLD TO DO SO IN THE INSTRUCTIONS BELOW.
NOTE: The handheld has a SD memory card installed in the side. This card contains specific information that is required for the use of
the TERMINATOR™ product. DO NOT replace this card with another. There should be no need to remove this card for normal
use.

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16.0 HANDHELD NAVIGATION & USE
The 3.5” handheld utilizes a touch screen display. All navigation is done through “touching” an icon or button on the screen. The following
is an overview of the different types of adjustment screens that are used in the display, and that may be utilized when tuning or making
selections.
16.1 Making Adjustments
Slider Bar: Slide the bar left or right with the stylus, or use the right and left arrow keys for fine adjustment (Figure 14).
List: Use the scroll bar on the right hand side of the screen to view all list entries. Touch the desired list item and click ‘OK’ to make a
selection (Figure 15).
Figure 14 –Slider Bar Figure 15 –List
On Screen Prompts: Follow the on screen text and use buttons at the bottom of the screen to continue or confirm.
17.0 HOME SCREEN
The HOME SCREEN has 4 selections (Figure 16). They are explained in more detail later in the instructions.
TUNING –Allows for various parameters to be easily adjusted.
MONITOR –A variety of gauge and dash displays.
FILE –Saves and loads files. Also shows information about the ECU and handheld controller.
WIZARDS –Creates a base calibration and performs the “TPS Autoset” function.
Figure 16
18.0 CALIBRATION WIZARD
The first step is to create an initial calibration using the WIZARDS located on the HOME SCREEN.
1. Select WIZARDS
2. Select START GCF WIZARD (Figure 17)
3. The Wizard process will guide you through each selection step. There will be a question at the top. Select the proper response and
select “Next” at the bottom. Selecting “Home” at any time will cancel the process.
4. Next, select “Holley TBI” for the system type (Figure 18)
5. Next, select “Terminator” for the TBI System Type
6. Select which type of transmission you are using, 4L60 or 4L80, or “None”.

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Figure 17 Figure 18
Figure 19 Figure 20
7. If your engine is up to 409 cubic inches, select “Up To 409 CID”. If your engine is larger than 409 cubic inches, select “410 CID and
Larger” (Figure 21).
8. The next choice should be dictated by the camshaft size and characteristics (Figure 22). If you have no idea, just simply select “Don’t
Know”.
The choices are further defined as:
“Street Strip” – Camshafts with over 225 degrees duration at .050” valve lift (225º@.050”).
“Mild Street” – Engines with non-stock camshafts that have between 214-224 degrees duration at .050” valve lift (214º-
224º@.050”).
“Factory Stock” – Engine that have a stock, factory camshaft, or aftermarket camshafts that have a duration BELOW 214
degrees at .050” valve lift (below 214º@.050”).
“Don’t know” – If you have no idea as to what type of camshaft is in your engine, choose this selection.
NOTE: If you are not sure of the camshaft size, it is best to select “Don’t know”.
Figure 21 Figure 22
9. Next, you need to select whether the ECU will be controlling the ignition timing (Figure 23). Select “Yes” ONLY if you are using a GM
small cap computer controlled HEI distributor or Ford TFI distributor. These are the only ignition distributors that allow the ECU timing
control using the TERMINATOR™ system. All other ignition/distributor types must be a standard mechanical advance type used on
any carbureted application. If you select “Yes”, proceed to step 10. If you select “No”, proceed to step 11.

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Figure 23 Figure 24
10. Select “GM Small HEI” or “Ford TFI” (Figure 24). Proceed to step 12.
11. If you are not controlling timing, you will have the following two choices. It is important the correct item is selected, as well as to
double-check that you used the proper input wire when the vehicle was wired.
“Coil – (neg)-” –Select this if you are NOT using an aftermarket Capacitive Discharge (CD) ignition box such as a MSD, Mallory, or
others. This is for stock, factory inductive ignition coils. Examples would be a factory GM large cap HEI, or a points style ignition with a
canister coil. You should have connected the solid yellow wire in the harness to the negative side of the ignition coil when the wiring was
performed.
“CD Box Tach Out” –Select this if you are using an aftermarket Capacitive Discharge (CD) ignition box such as a MSD, Mallory, or
others. When you wired the vehicle, you should have used an ignition adapter harness that had a yellow/black wire that you connected to
the “tach out” on the ignition box. Nothing should have been wired directly to the ignition coil.
NOTE: If you are unsure of this selection, or wiring, contact Holley tech service. Damage to the ECU will result due to improper wiring.
12. After entering the ignition type, your calibration will be created. Press the “Upload” button to send the calibration to the ECU (Figure
25). You will then see a screen showing “Uploading”. Finally you will see a screen indicating the file is uploaded (Figure 26). Cycle
the ignition switch for the calibration to take effect.
Figure 25 Figure 26
19.0 TPS AUTOSET
The next step is to perform a “TPS Autoset”. This must be done with the vehicle ignition power on. This must be done on a brand new
system otherwise the injectors and ignition will not be fired by the ECU. A TPS Autoset programs the ECU with the full travel/voltage
range from idle to wide open throttle for the Throttle Position Sensor (TPS). The TPS Autoset function is found under the “W IZARDS”
choice under the HOME SCREEN. Select “START TPS AUTOSET”. Follow the prompts. You can select “Home” at any point to stop the
process. If everything is successful, you will see a TPS Autoset Successful message.
Step 1: Select TPS Autoset Step 2
GCF file detected
TPS Autoset wizard