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White powder on Spark plugs??


MPH

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quote:
Originally posted by MPH
With nowadays gas, anybody have a clue what white powder deposit on plugs might mean?
Well, According to the book I have titled "Auto Mechanics: Theroy And Service" It says under spark plug color reading: "Extremely light deposits (white, yellow, pink) indicate combustion temperatures that are too high. Possible causes include vacuum leaks, lean mixtures, cooling system problems, and spark plugs of incorrect (too hot) heat range." Hope that helps.
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Its oil.You get white deposits before the plug fouls and gets oil soaked.It is ash.
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Thanks guys. I was thinkin lean fuel, never thought about vacuum leaks. Ash makes sence also.
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