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Jeep Truck
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1991
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Wrangler L6-242 4.0L VIN S MFI
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Repair and Diagnosis
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Specifications
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Mechanical Specifications
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Ignition System
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Spark Plug
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Gap Specifications
Gap Specifications
Setting Spark Plug Gap - Typical:
Check
spark plug
gap with a gap gauge, and adjust the gap, if necessary, by bending the ground electrode.
NOTE:
Do not put pressure on
spark plug
center electrode. Damage to insulator may result.