Misfires are one of the most common failures on a vehicle, yet they can be one of the most frustrating to diagnose. Not only does the technician need to determine which cylinder is misfiring, but they also need to determine why. There are 4 main players in order to make a cylinder fire properly: ignition, fuel, mechanical, and timing. It is up to the technician to determine which of these is the cause of the misfire.
- Determine which cylinder is misfiring
- Determine the cause of the misfire
- Understand how the PCM monitors misfires
- Develop a diagnostic strategy