Engine General Information and Diagnosis: 1A-8
Engine stalls often
(Incorrect fuel/air mixture)
Defective IAP sensor or circuit. Repair or replace.
Clogged fuel filter. Clean or replace.
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Damaged or cracked vacuum hose. Replace.
Defective ECT sensor. Replace.
Defective thermostat. Replace.
Defective IAT sensors. Replace.
Defective ISC valve. Replace.
Engine stalls often (Fuel
injector improperly
operating)
Defective fuel injectors. Replace.
No injection signal from ECM. Repair or replace.
Open or short circuited wiring
connection.
Repair or replace.
Defective battery or low battery voltage. Replace or recharge.
Engine stalls often
(Control circuit or sensor
improperly operating)
Defective ECM. Replace.
Defective fuel pressure regulator. Replace.
Defective TP sensor. Replace.
Defective IAT sensors. Replace.
Defective CKP sensor. Replace.
Defective ECT sensor. Replace.
Defective fuel pump relay. Replace.
Defective ISC valve. Replace.
ISC bad learning. Reset learned value.
Engine stalls often
(Engine parts improperly
operating)
Fouled spark plugs. Clean.
Defective CKP sensor or ECM. Replace.
Clogged fuel hose. Clean.
Out of adjustment tappet clearance. Adjust.
Dirty throttle body. Clean.
Engine noisy (Excessive
valve chatter)
Too large tappet clearance. Adjust.
Weakened or broken valve springs. Replace.
Worn tappet or cam surface. Replace.
Worn and burnt camshaft journal. Replace.
Engine noisy (Noise
seems to come from
piston)
Worn down pistons or cylinders. Replace.
Combustion chambers fouled with
carbon.
Clean.
Worn piston pins or piston pin bores. Replace.
Worn piston rings or ring grooves. Replace.
Engine noisy (Noise
seems to come from
timing chain)
Stretched chain. Replace.
Worn sprockets. Replace.
Tension adjuster not working. Repair or replace.
Engine noisy (Noise
seems to come from
crankshaft)
Rattling bearings due to wear. Replace.
Worn and burnt big-end bearings. Replace.
Worn and burnt journal bearings. Replace.
Worm bearings. Replace thrust bearing.
Engine noisy (Noise
seems to come from
balancer)
Rattling bearings due to wear. Replace.
Engine noisy (Noise
seems to come from
clutch)
Worn splines of countershaft or hub. Replace.
Worn teeth of clutch plates.
Replace.
Distorted clutch plate, driven and drive. Replace.
Worn clutch release bearing. Replace.
Weakened clutch dampers. Replace the primary driven gear.
Engine noisy (Noise
seems to come from
transmission)
Worn or rubbing gears. Replace.
Worn splines. Replace.
Worn or rubbing primary gears. Replace.
Worn bearings. Replace.
Condition Possible cause Correction / Reference Item
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