Engine Misfire
- Check for vacuum leaks.
- Check fuel quality.
- Check EGR system. See CODE 71 in TESTS W/CODES article.
- Check ignition signal circuit. See SPARK TEST in BASIC TESTING article.
- Check distributor and spark plugs.
- Check ignition coil. See SYSTEM/COMP TESTS article.
- Check water temperature sensor circuit. See CODE 22 in TESTS W/CODES article.
- Check idle speed control valve circuit. See IDLE SPEED CONTROL (ISC) VALVE CIRCUIT chart in TESTS W/CODES article.
- Check fuel system circuit. See FUEL SYSTEM CIRCUIT chart in TESTS W/CODES article.
- Check airflow meter circuit. See CODE 31 in TESTS W/CODES article.
- Check engine compression.
- Check injector circuit. See INJECTOR CIRCUIT chart in TESTS W/CODES article.
- Check cold start injector circuit. See COLD START INJECTOR CIRCUIT chart in TESTS W/CODES article.
- Check engine for mechanical failure.
- Check ECU. See SYSTEM/COMP TESTS article.