Poor Fuel Economy
- Check for fuel leakage.
- Check fuel quality.
- Check accelerator linkage.
- Check dashpot. See SYSTEM/COMP TESTS article.
- Ensure clutch is operating properly.
- Ensure brakes do not drag when released.
- Check EGR system. See SYSTEM/COMP TESTS article.
- Check fuel cut system. See SYSTEM/COMP TESTS article.
- Check spark plugs and distributor.
- Check engine compression and valve timing.
- Check fuel injectors. See SYSTEM/COMP TESTS article.
- Check cold start system. See SYSTEM/COMP TESTS article.
- 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 neutral start switch signal. See CODE 51 in TESTS W/CODES article.
- Check A/C signal circuit. See CODE 51 in TESTS W/CODES article.
- Check main oxygen sensor signal 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 sub-oxygen sensor circuit. See CODE 27 in TESTS W/CODES article.
- Check ECU. See SYSTEM/COMP TESTS article.