SERVICING INFORMATION 10-11 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. Valve timing out of adjustment 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 fuel injectors Replace. 9. Defective secondary fuel injectors Replace. 10. TP sensor out of adjustment Adjust. 11. Clogged air cleaner element Replace. 12. Imbalancing throttle valve synchronization Adjust. 13. Sucking air from throttle valve or vacuum hose Retighten or replace. 14. Too much engine oil Drain out excess oil. 15. Defective fuel pump or ECM Replace. 16. Defective CKP sensor and ignition coils Replace. Defective control circuit or sensor 1. Low fuel pressure Repair or replace. E 2. Defective TP sensor Replace. 3. Defective IAT sensor L Replace. 4. Defective CMP sensor P Replace. 5. Defective CKP sensor Replace. 6. Defective GP sensor Replace. M Replace. 7. Defective IAP sensor 8. Defective ECM Replace. A Replace. 9. Defective AP sensor 10. TP sensor out of adjustment Adjust. S Adjust. 11. Imbalanced throttle valve synchronization 12. Defective STP sensor and/or STVA Replace. 13. Defective EXCVA Replace.