Engine Controls - Tests W/O Codes: Symptoms: Backfire
- Check ignition timing.
- Check ignition coil output.
- Check for faulty spark plugs.
- Check EGR system.
- Check for crossfire between spark plugs.
- Check for sticking or leaking valves.
- Check for improper or worn camshaft.
- Check engine compression.
- Check fuel pressure.
- Check for correct valve timing.
- Check for cracks in exhaust and intake manifold.