Misfire on cylinder 2 (bank 1, cylinders 1-3). Coil and plug are the first suspects on the flat-six; swap-testing to an adjacent cylinder quickly isolates the fault.
SYMPTOMS
- Rough idle
- Check-engine light (may flash)
- Loss of power
- Hesitation
LIKELY CAUSES
- Failed ignition coil
- Worn spark plug
- Fuel injector fault
- Vacuum leak
- Low compression
DIAGNOSIS STEPS
- Read freeze-frame data
- Swap the coil/plug to an adjacent cylinder and see if the misfire follows
- Inspect the injector
- Compression/leak-down test if it persists
RELATED PARTS
- Ignition coil
- Spark plug