IGN7 - Check Secondary Display (Continued)

Low Spark Line:

^ Is there consistently low spark plug firing 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:
- Compression

- Vacuum leaks

- Fuel injectors

- Valves

NO -- Go to IGN8. IGN8 - Check Secondary Display (Continued)