Diagnosis And Testing - Engine Diagnosis - Performance
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
| CONDITION | POSSIBLE CAUSE | CORRECTION |
|---|---|---|
| ENGINE WILL NOT START | 1. Weak battery | 1. Charge or replace as necessary. |
| 2. Corroded or loose battery connections. | 2. Clean and tighten battery connections. Apply a coat of light mineral grease to the terminals. | |
| 3. Faulty starter. | 3. (Refer to ELECTRICAL/STARTING - DIAGNOSIS AND TESTING) . | |
| 4. Faulty coil or control unit. | 4. (Refer to ELECTRICAL/IGNITION CONTROL/IGNITION COIL - REMOVAL) . | |
| 5. Incorrect spark plug gap. | 5. (Refer to ELECTRICAL/IGNITION CONTROL/SPARK PLUG - CLEANING) . | |
| 6. Incorrect right bank cam timing. | 6. Refer to VALVE TIMING . | |
| 7. Dirt or water in fuel system. | 7. Clean system and replace fuel filter. | |
| 8. Faulty fuel pump, relay or wiring. | 8. Repair or replace as necessary. | |
| 9. Faulty cam or crank sensor | 9. Refer to IGNITION CONTROL . | |
| ENGINE STALLS OR ROUGH IDLE | 1. Vacuum leak. | 1. Inspect intake manifold and vacuum hoses, repair or replace as necessary. |
| - | ||
| 2. Faulty crank position sensor | 2. Replace crank position sensor. | |
| 3. Faulty coil. | 3. (Refer to ELECTRICAL/IGNITION CONTROL/IGNITION COIL - REMOVAL) . | |
| 4. Incorrect cam timing. | 4. (Refer to ENGINE/VALVE TIMING - STANDARD PROCEDURE) . | |
| ENGINE LOSS OF POWER | 1. Dirty or incorrectly gapped spark plugs. | 1. (Refer to ELECTRICAL/IGNITION CONTROL/SPARK PLUG - CLEANING) . |
| 2. Dirt or water in fuel system. | 2. Clean system and replace fuel filter. | |
| 3. Faulty fuel pump. | 3. (Refer to FUEL PUMP ). | |
| 4. Blown cylinder head gasket. | 4. Replace cylinder head gasket. | |
| 5. Low compression. | 5. (Refer to ENGINE - DIAGNOSIS AND TESTING) , repair as necessary. | |
| 6. Burned, warped or pitted valves. | 6. Replace as necessary. | |
| 7. Plugged or restricted exhaust system. | 7. Inspect and replace as necessary. | |
| 8. Faulty coil. | 8. (Refer to ELECTRICAL/IGNITION CONTROL/IGNITION COIL - REMOVAL) . | |
| 9. Incorrect cam timing. | 9. Refer to VALVE TIMING . | |
| ENGINE MISSES ON ACCELERATION | 1. Spark plugs dirty or incorrectly gapped. | 1. (Refer to ELECTRICAL/IGNITION CONTROL/SPARK PLUG - CLEANING) . |
| 2. Dirt in fuel system. | 2. Clean fuel system. | |
| 3. Burned, warped or pitted valves. | 3. Replace as necessary. | |
| 4. Faulty coil. | 4. (Refer to ELECTRICAL/IGNITION CONTROL/IGNITION COIL - REMOVAL) . | |
| ENGINE MISSES AT HIGH SPEED | 1. Spark plugs dirty or incorrectly gapped. | 1. (Refer to ELECTRICAL/IGNITION CONTROL/SPARK PLUG - CLEANING) . |
| 2. Faulty coil. | 2. (Refer to ELECTRICAL/IGNITION CONTROL/IGNITION COIL - REMOVAL) . | |
| 3. Dirt or water in fuel system. | 3. Clean system and replace fuel filter. |