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usually white buildup on a spark plug is caused by oil or fuel additives or poor quality gasoline.

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15y ago

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What causes white build up on spark plugs?

AnswerWhite buildup is usually caused by running too lean, tan is normal, black is running too rich The white buildup can also be caused by heat. The wrong heat range spark plug , overadvanced ignition timing, intake manifold vacuum leaks, sticking intake or exhaust valves, or insufficient engine cooling are all possible causes.


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