8-4 SERVICING INFORMATION
ENGINE
Complaint Symptom and possible causes Remedy
Engine will not start, Compression too low
or is hard to start. 1. Out of adjustment valve clearance. Adjust.
2. Worn valve guides or poor seating of valves. Repair or replace.
3. Mistiming valves. Adjust.
4. Excessively worn piston rings. Replace.
5. Worn-down cylinder bores. Replace.
6. Too slowly starter motor cranks. See electrical section.
7. Poor seating of spark plugs. Retighten.
Plugs not sparking
1. Fouled spark plugs. Clean.
2. Wet spark plugs. Clean and dry.
3. Defective ignition coil or plug cap. Replace.
4. Defective CKP sensor. Replace.
5. Defective ECM. Replace.
6. Open-circuited wiring connections. Repair or replace.
No fuel reaching intake manifold
1. Clogged fuel filter or fuel hose. Clean or replace.
2. Defective fuel pump. Replace.
3. Defective fuel pressure regulator. Replace.
4. Defective fuel injector. Replace.
5. Defective fuel pump relay. Replace.
6. Defective ECM. Replace.
7. Open-circuited wiring connections. Check and repair.
Incorrect fuel/air mixture
1. Out of adjustment throttle position sensor. Adjust.
2. Defective fuel pump. Replace.
3. Defective fuel pressure regulator. Replace.
4. Defective throttle position sensor. Replace.
5. Defective crankshaft position sensor. Replace.
6. Defective intake air pressure sensor. Replace.
7. Defective atmospheric pressure sensor. Replace.
8. Defective ECM. Replace.
9. Defective engine oil temp. sensor. Replace.
10. Defective intake air temp. sensor. Replace.
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