Grand Caravan FWD V6-229 3.8L VIN L MFI (1997)
Spark Plug: Testing and Inspection
Broken, Cracked or Chipped Insulator
Chipped Electrode Insulator
NOTE: Replace any spark plugs which have cracked broken or chipped insulators.
Symptoms: Insulator chipped or broken.
Possible Causes:
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Usually results from bending the center electrode while adjusting the spark plug electrode gap.
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Severe detonation also can separate the insulator from the center electrode.
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Sudden Rise In Tip Temperature.
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Severe Operating Conditions.
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Improper Gapping Of Plugs.