Detonation/Spark Knock

If engine exhibits a mild-to-severe ping or knock (usually worse under acceleration), check the following items:

• Ensure ignition timing and controls are working properly.
• Ensure spark plug application and gap is correct.
• Check EGR valve and solenoid operation.
• Ensure transaxle/transmission shift points are correct.
• Check Torque Converter Clutch (TCC) operation.
• Ensure correct ECM application. Check with dealer for latest application information.
• Check for engine overheating.
• Check coolant temperature sensor.
• Check for contaminated or poor quality fuel.
• Check fuel pressure.
• Check for incorrect or damaged basic engine parts such as camshaft, cylinder heads or pistons.
• Check for excessive carbon build-up on engine components.
• Check for excessive oil entering the engine.