2007 > 2.7L V6 GASOLINE >
TROUBLESHOOTING
Symptom Suspect area Remedy
Engine misfire with
abnormal internal
lower engine noises.
Worn crankshaft bearings.
Loose or impropes engine drive plate. Replace the crankshaft and bearings as
required.
Repair or replace the drive plate as required.
Worn piston rings.
(Oil consumption may or may not cause the
engine to misfire.)
Inspect the cylinder for a loss of compression.
Repair or replace as required.
Worn crankshaft thrust bearings Replace the crankshaft and bearings as
required.
Engine misfire with
abnormal valve train
noise.
Stuck valves.
(Carbon buildup on the valve stem) Repair or replace as required.
Excessive worn or mis-aligned timing chain. Replace the timing chain and sprocket as
required.
Worn camshaft lobes. Replace the camshaft and valve lifters.
Engine misfire with
coolant consumption. a. Faulty cylinder head gasket and/or
cranking or other damage to the cylinder
head and engine block cooling system.
b. Coolant consumption may or may not
cause the engine to overheat.
a. Inspect the cylinder head and engine
block for damage to the coolant passages
and/or a faulty head gasket.
b. Repair or replace as required.
Engine misfire with
excessive oil
consumption.
Worn valves, guides and/or valve stem oil
seals. Repair or replace as required.
Worn piston rings.
(Oil consumption may or may not cause the
engine to misfire)
a. Inspect the cylinder for a loss of
compression.
b. Repair or replace as required.
Engine noise on start-
up, but only lasting a
few seconds.
Incorrect oil viscosity. a. Drain the oil.
b. Install the correct viscosity oil.
Worn crankshaft thrust bearing. a. Inspect the thrust bearing and crankshaft.
b. Repair or replace as required.
Upper engine
noise,regardless of
engine speed.
Low oil pressure. Repair or replace as required.
Broken valve spring. Replace the valve spring.
Worn or dirty valve lifters. Replace the valve lifters.
Stretched or broken timing chain and/or
damaged sprocket teeth. Replace the timing chain and sprockets.
Worn timing chain tensioner, if applicable. Replace the timing chain tensioner as
required.
Worn camshaft lobes. a. Inspect the camshaft lobes.
b. Replace the timing camshaft and valve
lifters as required.
Worn valve guides or valve stems. Inspect the valves and valve guides,then
repair as required.
Stuck valves. Carbon on the valve stem or
valve seat may cause the valve to stay open. Inspect the valves and valve guides, then
repair as required.
Worn drive belt, idler, tensioner and bearing. Replace as required.
Lower engine
noise,regardless of Low oil pressure. Repair as required.
