K 1500 Yukon XL 4WD V8-8.1L VIN G (2001)
Spark Plug: Service and Repair
Spark Plug Inspection
SPARK PLUG USAGE
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Ensure that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to Ignition System Specifications for
the correct spark plug.
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Ensure that the spark plug has the correct heat range. An incorrect heat range causes the following conditions:
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Spark plug fouling-Colder plug
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Pre-ignition causing spark plug and/or engine damage-Hotter plug
SPARK PLUG INSPECTION
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Inspect the terminal post (1) for damage.
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Inspect for a bent or broken terminal post (1).
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Test for a loose terminal post (1) by twisting and pulling the post. The terminal post (1) should NOT move.