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These malfunctions may be classified as either performance (e.g., engine idles rough and stalls) or mechanical (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) - PERFORMANCE and (Refer to 9 - ENGINE - DIAGNOSIS Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that can not be iso- • Cylinder Compression Pressure Test (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) • Cylinder Combustion Pressure Leakage Test (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). • Engine Cylinder Head Gasket Failure Diagnosis (Refer to 9 - ENGINE/CYLINDER HEAD - DIAGNOSIS AND • Intake Manifold Leakage Diagnosis (Refer to 9 - ENGINE/MANIFOLDS/INTAKE MANIFOLD - DIAGNOSIS ENGINE DIAGNOSIS - PERFORMANCE CONDITION POSSIBLE CAUSE CORRECTION ENGINE WILL NOT START 1. Weak battery 1. Charge or replace as necessary. 2. Corroded or loose battery 2. Clean and tighten battery 3. Faulty starter. 3. (Refer to 8 - ELECTRICAL/ 4. Faulty coil or control unit. 4. (Refer to 8 - ELECTRICAL/ 5. Incorrect spark plug gap. 5. (Refer to 8 - ELECTRICAL/ 6. Incorrect right bank cam timing. 6. Refer to engine timing in this 7. Dirt or water in fuel system. 7. Clean system and replace fuel 8.Faulty fuel pump, relay or wiring. 8.Repair or replace as necessary. 9. Faulty cam or crank sensor 9. Refer to Ignition system. ENGINE STALLS OR ROUGH IDLE 1. Vacuum leak. 1. Inspect intake manifold and 2. Faulty crank position sensor Replace crank position sensor 3. Faulty coil. 3. (Refer to 8 - ELECTRICAL/ 4. Incorrect cam timing. 4. (Refer to 9 - ENGINE/VALVE 9 - 1168 ENGINE - 3.7L SERVICE INFORMATION WK |