SERVICING INFORMATION 10-7 ENGINE Complaint Symptom and possible causes Remedy Engine will not start Compression too low or is hard to start. 1. Valve clearance out of adjustment 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. Plug not sparking 1. Fouled spark plugs Clean. 2. Wet spark plugs Clean and dry. 3. Defective ignition coil Replace. 4. Defective CKP sensor Replace. 5. Defective ECM Replace. 6. Open-circuited wiring connections Repair or replace. No fuel reaching the intake manifold 1. Clogged fuel filter or fuel hose Clean or replace. 2. Defective fuel pump Replace. E 3. Defective fuel pressure regulator L Replace. 4. Defective fuel injector Replace. 5. Defective fuel pump relay P Replace. 6. Defective ECM Replace. 7. Open-circuited wiring connections Check and repair. M Incorrect fuel/air mixture A Adjust. 1. TP sensor out of adjustment 2. Defective fuel pump Replace. S Replace. 3. Defective fuel pressure regulator 4. Defective TP sensor Replace. 5. Defective CKP sensor Replace. 6. Defective IAP sensor Replace. 7. Defective ECM Replace. 8. Defective ECT sensor Replace. 9. Defective IAT sensor Replace. 10. Defective AP sensor Replace.