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10·8
SERVICING
INFORMATION
Complaint
Symptom
and
possible
causes
Remedy
Engine
lacks
power. Defective
engine
internal/electrical
parts
1. Loss of tappet clearance. Adjust.
2. Weakened valve springs.
Replace.
3. Out of adjustment valve timing. Adjust.
4. Worn piston rings or cylinders. Replace.
5. Poor seating of valves.
Repair.
6. Fouled spark plugs.
Clean or replace.
7. Incorrect spark plugs.
Adjust or replace.
8. Clogged injectors.
Clean.
9. Out of adjustment TP sensor.
Adjust.
10. Clogged air cleaner element.
Clean.
11. Imbalancing throttle valve synchronization. Adjust.
12. Sucking air from throttle valve or vacuum hose.
Retighten or replace.
13. Too much engine oil.
Drain out excess oil.
14. Defective fuel pump or ECM.
Replace.
15. Defective CKP sensor and ignition coils.
Replace.
Defective
control
circuit
or
sensor
1. Low fuel pressure.
Repair or replace.
2. Defective TP sensor. Replace.
3. Defective IAT sensor.
Replace.
4. Defective CMP sensor.
Replace.
5. Defective CKP sensor.
Replace.
6. Defective GP sensor. Replace.
7. Defective lAP sensor. Replace.
8. Defective ECM. Replace.
9. Defective AP sensor. Replace.
10. Out of adjustment TP sensor.
Replace.
11. Defective STP sensor and/or STV actuator. Replace.
12. Defective EXCV actuator.
Replace.
Engine overheats.
Defective
engine
internal
parts
1. Heavy carbon deposit on piston crowns. Clean.
2. Not enough oil in the engine.
Add oil.
3. Defective oil pump or clogged oil circuit.
Replace or clean.
4. Sucking air from intake pipes.
Retighten or replace.
5. Use incorrect engine oil. Change.
6. Defective cooling system.
See radiator section.
Lean fuel/air
mixture
1. Short-circuited lAP sensor/lead wire.
Repair or replace.
2. Short-circuited IAT sensor/lead wire. Repair or replace.
3. Sucking air from intake pipe joint.
Clean or replace.
4. Defective fuel injectors.
Repair or replace.
5. Defective ECT sensor.
Replace.
The
other
factors
1. Ignition timing is too advanced due to defective Replace.
timing advance system (ECT sensor, GP sensor,
CKP sensor and ECM.)
2.
Drive chain is too tight. Adjust.