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2004 > G 2.0 DOHC > Engine Mechanical System
TROUBLESHOOTING
Symption Suspect area Remedy (See page)
Engine misfire with abnormal Loose or improperly installed engine Repair or replace the flywheel as
internal lower engine noises. flywheel. required.
Worn piston rings Inspect the cylinder for a loss of
(Oil cousumption may or may not compression.
cause the engine to misfire.) Repair or replace as required.
Replace the crankshaft and bearings
Worn crankshaft thrust bearings
as required
Engine misfire with abnormal Stuck valves.
Repair or replace as required
valve train noise. (Carbon buidup on the valve stem)
Excessive worn or mis-aligned timing Replace the timing chain and
chain sprocket as required.
Replace the camshaft and valve
Worn camshaft lobes.
lifters.
• Faulty cylinder head gasket and/
• Inspect the cylinder head and
or cranking or other damage to
engine block for damage to the
Engine misfire with coolant the cylinder head and engine
coolant passages and/or a faulty
cousmption block cooling system.
head gasket.
• Coolant consumprion may or may
• Repair or replace as required.
not cause the engine to overheat.
Engine misfire with excessive Worn valves, guides and/or valve
Repair or replace as required.
oil consumption stem oil seals.
Worn piston rings. • Inspect the cylinder for a loss of
(Oil consumption may or may not compression.
cause the engine to misfire) • Repair or replace as required.
Engine noise on start-up, but • Drain the oil.
Incorrect oil viscosity
only lasting a few seconds. • Install the correct viscosity oil.
• Inspect the thrust bearing and
Worn crankshaft thrust bearing. crankshaft.
• Repair or replace as required.
Upper engine noise, regardless Low oil pressure Repair or repalce as required.
of engine speed.
Broken valve spring. Replace the valve spring.
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Worn or dirty valve lifters. Replace the valve lifters.
Stetched or broken timing chain and/ Replace the timing chain and
or damaged sprocket teeth. sprockets.
Worn timing chain tensioner, if Replace the timing chain tensioner
applicable. as required.
• Inspect the camshaft lobes.
Worn camshaft lobes. • Replace the timing camshaft and
valve lifters as required.
Inspect the valves and valve guides,
Worn valve guides or valve stems.
then repair as required.
Stuck valves. (Carbon on the valve
Inspect the valves and valve guides,
stem or valve seat may cause the
then repair as required.
valve to stay open.
Lower engine noise, regardless Low oli pressure. Repair or required.
of engine speed
Loose or damaged flywheel. Repair or replace the flywheel.
• Inspect the oil pan.
Damaged oil pan, contacting the oil
• Inspect the oil pump screen.
pump screen.
• Repair or replace as required.
Oil pump screen loose, damaged or • Inspect the oil pump screen.
restircted. • Repair or replace as required.
• Inspect the piston, piston pin and
Excessive piston-to-cylinder bore
cylinder bore.
clearance.
• Repair as required.
• Inspect the piston, piston pin and
Excessive piston pin-to-clearance the connecting rod.
• Repair or replace as required.
Inspect the following components
and repair as required.
Excessive connecting rod bearing • The connecting rod bearings.
rod clearance • The connecting rods.
• The crankshaft.
• The crankshaft journal.
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Inspect the following components,
Excessive crankshaft bearing and repair as required.
clearance • The crankshaft bearing.
• The crankshaft journals.
• Verify the piston pins and
Incorrect piston, piston pin and connecting rods are installed
connecting rod installation correctly.
• Repair as required.
Engine noise under load Low oil pressure Repair or replace as required.
Inspect the following components
and repair as required :
Excessive connecting rod bearing
• The connecting rod bearings.
clearance
• The connecting rods.
• The crankshaft
Inspect the following components,
and repair as required.
Excessive crankshaft bearing
• The crankshaft bearings.
clearance
• The crankshaft journals.
• The cylinder block crankshaft
Engine will not crank- 1.Remove spark plugs and check
crankkshaft will not rotate for fluid.
Hydraulically cylinder
2.Inspect for broken head gasket.
• Coolant/antifreeze in cylinder.
3.Inspect for cracked engine black
• Oil in cylinder.
or cylinder head.
• Fuel in cylinder
4.Inspect for a sticking fuel injector
and/or leaking fuel regulator.
Broken timing chain and/or timing 1.Inspect timing chain and gears.
chain and/or timing chain gears. 2.Repair as required.
Material cylinder 1.Inspect cylinder for damaged
• Broken valve components and/or foreign
• Piston material materials.
• Foreign material 2.Repair or replace as required.
1.Inspect crankshaft and connecting
Seized crankshaft or connecting rod
rod bearing.
bearings.
2.Repair as required.
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1.Inspect connecing rods.
Bent or broken connecting rod.
2.Repair as required.
1.Inspect crankshaft.
Broken crankshaft
2.Repair as required.
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