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What is a fouled spark plug?

fouled PLUG SPARK
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What is a fouled spark plug?

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Fouling spark plugs can happen when the tip temperature is insufficient to burn off carbon, fuel, oil or other deposits and causes spark to leach to metal shell…no spark across plug gap will cause a misfire. Wet-fouled spark plugs must be changed as they won’t fire. Dry-fouled spark plugs can sometimes be successfully cleaned by bringing the engine up to the operating temp.

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