Spark Plug Diagnosis chart with fouling examples and cold vs hot…

Spark Plug DIagnosis
IF THE IMAGE IS TOO SMALL, click it.
The inside back cover of any Haynes manual is much better than this B&W diagram.



5.8L MotorCraft SP-415, SP-501
5.0L MotorCraft SP-450, SP-502
4.9L MotorCraft SP-435

Spark plug & coil wires should measure ~7KOhm/foot from the terminal inside the distributor cap to the terminal in the boot that slips over the spark plug.



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See also:
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Owner caption October 2010 · Photo 3548 of 5000