Engine Backfires: Sensor/System
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- 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.