Spark Knock/Detonation
- Check cooling system.
- Check fuel pressure.
- Check spark plugs.
- Check for adequate spark with a spark tester.
- Check ignition and valve timing.
- Check for clogged fuel filter.
- Check for vacuum leaks.
- Check for excessive combustion chamber deposits.
- Check for engine overheating.
- Check for malfunctioning electronic fuel injection system.
- Check for malfunctioning EGR valve.