10-10 SERVICING INFORMATION Complaint Symptom and possible causes Remedy Engine runs poorly Defective engine internal/electrical parts in high speed range. 1. Weakened valve springs Replace. 2. Worn camshafts Replace. 3. Valve timing out of adjustment Adjust. 4. Too narrow spark plug gaps Adjust. 5. Ignition not advanced sufficiently due to poorly Replace ECM. working timing advance circuit 6. Defective ignition coils Replace. 7. Defective CKP sensor Replace. 8. Defective ECM Replace. 9. Clogged air cleaner element Clean. 10. Clogged fuel hose, resulting in inadequate fuel Clean and prime. supply to injector 11. Defective fuel pump Replace. 12. Defective TP sensor Replace. 13. Defective STP sensor or STVA Replace. Defective air flow system 1. Clogged air cleaner element Replace. 2. Defective throttle valve Adjust or replace. E 3. Defective secondary throttle valve Adjust or replace. 4. Sucking air from throttle body joint LRepair or replace. 5. Defective ECM P Replace. 6. Imbalancing throttle valve synchronization Adjust. Defective control circuit or sensor 1. Low fuel pressure M Repair or replace. 2. Defective TP sensor Replace. A Replace. 3. Defective IAT sensor S Replace. 4. Defective CMP sensor 5. Defective CKP sensor Replace. 6. Defective GP sensor Replace. 7. Defective IAP sensor Replace. 8. Defective ECM Replace. 9. TP sensor out of adjustment Replace. 10. Defective STP sensor and/or STVA Replace.