Poor DRIVEABILITY: Knocking
- Check fuel quality.
- Check knock sensor circuit. See CODE 52, CODE 53 and CODE 55 in TESTS W/CODES article.
- Check spark plugs.
- Check injector circuit. See INJECTOR CIRCUIT chart in TESTS W/CODES article.
- Check EGR system. See CODE 71 in TESTS W/CODES article.
- Check engine for mechanical failure.
- Check ECU. See SYSTEM/COMP TESTS article.