Spark Plug Condition
NOTE:
Inspecting spark plug condition can determine whether problem is related to a specific cylinder or to all cylinders.
Wet/Carbon Is Stuck On Specific Plug:
- Check for weak spark.
- Check for excessive fuel injection volume.
- Check for no or low compression.
- Check for faulty spark plug.
Grayish White With Specific Plug:
- Check for insufficient fuel injection volume.
- Check for faulty spark plug.
Wet/Carbon Stuck On All Plugs:
- Check for too rich air/fuel mixture.
- Check for low compression.
- Check for clogging in intake and exhaust systems.
Grayish White With All Plugs:
- Check for too lean air/fuel mixture.