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Why are the ceramic parts of my spark plugs in my car covered in a brown deposit?
Wiki User
∙ 14y ago
Normal combustion deposits. If the color is black, to rich a mixture. If the deposit
is oily, piston rings or valve guides are worn, allowing crankcase oil to enter.
If the insulator is glazed white, too lean a mixture or the plug is running too hot for the engine cycle duty (steady highway driving vs stop and go traffic).
Wiki User
∙ 14y ago
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