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Spark Plug Question

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94Jettameowpsst

15+ Year Contributor
1,341
4
Dec 30, 2004
Pittsburgh, Pennsylvania
Alright, i know if your plugs are white you are running lean and or if you have little specs on your plugs its from massive detonation and such. Well what if you blow massive amounts of black smoke (well not massive) and have no knock what so ever and you still have plug symptoms of running lean? I know the other thing that could cause it to be white would be coolant in your cylinders, but all the plugs w/ an even solid whitish color?

On a side note, im talking about the part of the plug that sits over the electrode, the whole inside of the plug and porcelain is black.
 
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