No Complete Combustion
- Check fuel pump control circuit. See CODE 78 in TESTS W/CODES - EXCEPT OBD-II article in the ENGINE PERFORMANCE section.
- Check ignition coil resistance.
- Check distributor sensors.
- Check spark plugs.
- Check ignition signal circuit. See SPARK TEST under IGNITION CHECKS in BASIC TESTING article in the ENGINE PERFORMANCE section.
- Check fuel injector circuit.