Carbon on the plugs

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Author Message   Erik G. Burrows (Erik) Senior Member Username: Erik Post Number: 266 Registered: 04-2002 Posted on Monday, November 17, 2003 - 03:41 pm:    How much carbon on spark plugs is too much? This plug is about 100 miles old. My truck has been idling a little rough, and I'm suspecting it's running rich.   Erik G. Burrows (Erik) Senior Member Username: Erik Post Number: 267 Registered: 04-2002 Posted on Monday, November 17, 2003 - 03:44 pm:    BTW: The plug I pulled 100 miles ago was about 10k miles old, and had flakey carbon all along the metal casing, and the ceramic center was black.