Spark Plug Condition Chart

Spark Plug Condition Chart. Oil Fouled Combustion deposits are slight and not heavy enough to cause any detrimental effect on engine performance. You can find Images and PDF's from Autolite, NGK, and other on how to read the color and condition of your spark plugs.

AC spark plug application chart. (Jerome Brock)

Being able to "read" a spark plug can be a valuable tuning aid. Good running conditions: If everything is good, the spark plug should have a tan/light brown color. Spark plugs are a popular item to change, and it is important to know what a good spark plug vs. a bad one looks like.

Make sure the extension is long enough for you to be able to screw the plug into place with it.

Appearance & Symptoms: Dry fouling (top) appears as sooty, black build-up.

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Black, oily Spark Plug: Oil fouled (see valves or piston rings.) White, no color on spark plug: Too lean. Reinstall the power connector to each spark coil. Replace with new plugs of the same heat range.

Judul: Spark Plug Condition Chart
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Arleen Butler

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