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SERVICING INFORMATION 10-7
Complaint Symptom and possible causes Remedy
Engine idles poorly. 1. Valve clearance out of adjustment
2. Poor seating of valves
3. Defective valve guides
4. Worn down camshafts
5. Too wide spark plug gaps
6. Defective ignition coil/plug caps
7. Defective CKP sensor
8. Defective ECM
9. Defective TP sensor
10. Defective fuel pump
11. Imbalanced throttle valve
12. Damaged or cracked vacuum hose
Adjust.
Replace or repair.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Engine stalls often. Incorrect fuel/air mixture
1. Defective IAP sensor or circuit
2. Clogged fuel filter
3. Defective fuel pump
4. Defective fuel pressure regulator
5. Defective ECT sensor
6. Defective thermostat
7. Defective IAT sensor
8. Damaged or cracked vacuum hose
Fuel injector improperly operating
1. Defective fuel injectors
2. No injection signal from ECM
3. Open or short circuited wiring connection
4. Defective battery or low battery voltage
Control circuit or sensor improperly operating
1. Defective ECM
2. Defective fuel pressure regulator
3. Defective TP sensor
4. Defective IAT sensor
5. Defective CMP sensor
6. Defective CKP sensor
7. Defective ECT sensor
8. Defective fuel pump relay
Engine internal parts improperly operating
1. Fouled spark plugs
2. Defective CKP sensor or ECM
3. Clogged fuel hose
4. Out of adjustment tappet clearance
Repair or replace.
Clean or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Repair or replace.
Replace or recharge.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Clean.
Replace.
Clean.
Adjust.