what are major causes of carbon build up?
#5
If the engine is running rich for any reason, it will accelerate carbon build-up.
Also, poor combustion, like from long periods of poor-quality idling (those of us with long-duration cams know what that's all about).
Also, poor combustion, like from long periods of poor-quality idling (those of us with long-duration cams know what that's all about).