400E (124.034) V8-4.2L (119.975) (1992)
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Spark Plug: Testing and Inspection
Spark Plug Chart
1.
Inspect the spark plugs for:
^
Electrode gap (refer to SPECIFICATIONS)
^
Carbon deposits
^
Cracked center electrode insulator
^
Burned or worn electrodes (may be caused by):
^ Excessive mileage
^ Lean air/fuel mixture
^ Advanced ignition timing
^ Loose spark plug
^ Plug heat range too high
^ Insufficient Cooling
