IGN8 - Check Secondary Display (Continued)

^ Is there consistently low spark plug firing voltage or sloping spark line in one or more cylinders?

YES -- CHECK for ignition problems affecting some cylinders:
- Fouled spark plug(s)
- Narrow spark plug gap(s)
- Spark plug wire(s) grounding on engine
INSPECT for damage.
- Carbon tracking in cap
CHECK for mechanical problems affecting some cylinders:
- Valves
- Fuel Injectors
- Compression

NO -- Go to IGN9. IGN9 - Check Secondary Display (Continued)