White Powder On Spark Plug Wires

White Powder On Spark Plug Wires. The white residue comes from water boiling out of the spark plug holes. This can be very bad if something that is putting out a lot of electricity.

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When these conditions prevail, even a plug of the correct heat range, will overheat. You sometimes see a very bright white electrode with black dots on it also as a heat range issue in some cases cracked electrodes. At first glance, i thought the dark area on the cap was grease.

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