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Spark Plug Color Chart. Furthermore indicating the plug is in the correct heat range. Wear factors for spark plugs.
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Furthermore indicating the plug is in the correct heat range. And has been operating in a healthy engine. Dark coloring such as heavy black wet or dry deposits can indicate an overly rich condition too cold a heat range spark plug a possible vacuum leak low compression overly retarded timing or too large a plug gap.
Oil could be leaking into the cylinders getting past pistons that are.
Correct heat range for engine and operating conditions. Rounded electrodes with a small amount of deposits on the firing end. To cause any detrimental effect on engine performance. Spark Plug Color Chart - Reading Your Plugs This page is nothing new.
