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