Engine Backfires
- Ensure proper spark exists from ignition system.
- Ensure ignition timing is correct.
- Check valve timing and timing belt (if equipped).
- Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).
- Check EGR system.
- Check Throttle Position Sensor (TPS) and wiring.
- Check airflow meter or vacuum sensor and wiring.
- Check coolant temperature sensor and wiring.
- Check air temperature sensor and wiring.
- Check oxygen sensor and wiring.