The DME detected misfires across multiple or random cylinders. Unburned fuel reaching the catalysts risks expensive converter damage.
SYMPTOMS
- Flashing or steady check-engine light
- Rough idle
- Stumble
- Power loss
- Possible stall
LIKELY CAUSES
- Worn coils or spark plugs
- Vacuum/intake leak
- Low fuel pressure
- Lean condition
- Injector fault
DIAGNOSIS STEPS
- Read misfire counters per cylinder
- Inspect plugs and coils
- Check fuel pressure and fuel trims
- Smoke-test for vacuum leaks
RELATED PARTS
- Spark plugs
- Ignition coils
- Fuel injectors