Grand Cherokee 2WD V8-318 5.2L VIN Y MFI (1994)
Spark Plug: Testing and Inspection
Broken, Cracked or Chipped Insulator
Spark Plug Inspection
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A chipped electrode insulator usually results from bending the center electrode while adjusting the spark plug electrode gap.
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Under certain conditions, severe detonation can also separate the insulator from the center electrode. Spark plugs with this condition must be
replaced.
