Join Date: Nov 2001
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Re: Rolled the Jeep and now it backfires?!?!?!
Carbon traces are burn lines caused when the spark can't take it's normal path to ground through the plug. When the coil gets charged, it's going to try to dissipate that charge somewhere. It'll go to the coil mount, the coil primary connections, down the side of the distributor, anywhere it can get to ground to dissipate the charge.
A loose engine ground is one of the things that causes the problem, bad secondary wires, spark plug or coil wire are others. Start it up in total darkness and see if you see little lightning strikes around the coil and/or distributor especially.