Spark Knock/Detonation
- Check for engine running hot because of low coolant or other cooling system faults.
- Check for correct fuel octane rating.
- Check knock sensor (if equipped) and circuit.
- Check for correct PROM or EEPROM.
- Check spark plugs for correct heat range.
- Check ignition timing.
- Check for low fuel pressure.
- Check EGR system operation.
- Check automatic transmission/transaxle for correct shift points.
- Check for carbon build-up in cylinders.