IGN6 - Check Secondary Display (Continued)

High Firing Line:

^ Is there consistently high spark plug firing voltage in one or more cylinders?

YES -- Check for ignition problems affecting some cylinders:
- Wide spark plug gap(s) or worn electrode(s)

- Improperly installed cap or rotor

- Spark plug wire(s) are firmly connected to distributor cap or spark plug.

Check for mechanical problems affecting some cylinders:
- Compression

- Vacuum leaks

- Fuel injectors

- Valves

Go to IGN11. IGN11 - Check Spark Plug Wire Resistance

NO -- Go to IGN7. IGN7 - Check Secondary Display (Continued)