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Spark Plugs
Spark Plug Inspection
Spark plug condition is indicative of engine operation. Check the spark
plug firing end condition after the engine has been warmed up and the
vehicle has been driven at higher speeds. Immediately check the spark
plug for correct color.
Normal Spark Plug
The normal insulator tip is tan or brown. There will be few combustion
deposits. The electrodes are not burned or eroded. This indicates the
proper type and heat range for the engine and the service.
NOTE: The tip should not be white. A white insulator tip indicates overheating,
caused by use of an improper spark plug or incorrect throttle body/
carburetor adjustments.
Wet Fouled Spark Plug
The wet fouled insulator tip is black. A damp oil film covers the firing
end. There may be a carbon layer over the entire nose. Generally, the
electrodes are not worn. General causes of fouling are excessive oil con-
sumption, improper use of the choke or incorrect throttle body/carbure-
tor adjustments.