Poor DRIVEABILITY: Backfire
- Check EGR system.
- Check valve timing.
- Check water temperature sensor circuit. See CODE 22 in TESTS W/CODES article.
- Check throttle position sensor circuit. See CODE 41 in TESTS W/CODES article.
- Check airflow meter circuit. See CODE 31 and CODE 32 in TESTS W/CODES article.
- Check main oxygen sensor circuit. See CODE 25 and CODE 26 in TESTS W/CODES article.
- Check intake air temperature sensor circuit. See CODE 24 in TESTS W/CODES article.
- Check fuel pump and fuel pressure regulator. See SYSTEM/COMP TESTS article.
- Check fuel lines for damage.
- Check fuel injectors. See SYSTEM/COMP TESTS article.
- Check ECU. See SYSTEM/COMP TESTS article.