Detonation Or Spark Knock
If engine exhibits a mild or severe ping, which is usually worse under acceleration, check the following:
- Check coolant level.
- Check water pump drive belt.
- Check air flow to radiator.
- Check coolant flow through radiator.
- Check thermostat.
- Ensure cooling fan operation is correct.
- Ensure coolant temperature sensor signal is correct.
- Check fuel quality (octane rating).
- Ensure Mem-Cal is correct for vehicle application.
- Ensure spark plug heat range is correct.
- Ensure ignition timing is correct.
- Ensure fuel pressure is correct.
- Ensure EGR system operation is correct.
- Check transmission for correct shift points.
- Check for excessive oil entering the combustion chambers.
- Remove excessive carbon from combustion chamber with top end cleaner.
- Ensure correct engine components are installed (camshaft, head, pistons etc).