IGN7 - Check Secondary Display (Continued)

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

YES -- CHECK for ignition problems affecting some cylinders:
- Spark plug wire(s) are firmly connected to distributor cap or spark plug
- Wide spark plug gap(s)
- Open plug wire(s)
- Go to IGN11. IGN11 - Check Spark Plug Wire Resistance

CHECK for mechanical problems affecting some cylinders:
- Valves
- Fuel injectors
- Compression

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