Poor DRIVEABILITY: Knocking
- Check knock sensing circuit. See Code 52 in TESTS W/CODES article.
- Check fuel quality.
- Check spark plugs.
- Check EGR system. See SYSTEM/COMP TESTS article.
- Check valve timing, radiator, radiator cap, thermostat and water pump.
- Check cooling fans. See SYSTEM/COMP TESTS article.
- Check ECU. See SYSTEM/COMP TESTS article.