Engine Backfires: Sensor/System
- Check for the following intermittent ignition system conditions:
- Intermittent CKP 18X signal.
- Intermittent ignition feed circuit or sensor ground circuit to the crankshaft position sensor or the camshaft position sensor.
- Intermittent 3X reference signal.
- Intermittent camshaft position signal.
- Inspect the Mass Air Flow (MAF) sensor conditions. Ensure that the MAF sensor honeycomb is not damaged.