Originally posted by mcfast:
Originally posted by warmonger:
Originally posted by mcfast:
That is not caused buy arcing, it is caused buy blowbuy from the cylder throu the spark plug.
sorry for the spelling



Through the plug?? It'd have to be broke for that. Maybe around it if it wasn't tightened, but then the wire would be colored like that too. More likely just some oil from the valve cover o-ring around the spark plug port that was down in the port and baked onto the plug.

No I do not think so!!!!!


That brown stain is normally caused by the porcelin leaching oil from the end exposed to the cylinder. Also as the porcelin heat cycles it can become minutely looser in the metal shell. This can increase the oil staining because of increasing or starting internal blowby.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.