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Home >> GMC >> 2004 >> Jimmy 4D Utility, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.3L (Introduction) >> Repair Instructions >> Spark Plug Wire Inspection
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Spark Plug Wire Inspection

Spark plug wire integrity is vital for proper engine operation. A thorough inspection will be necessary to accurately identify conditions that may affect engine operation. Inspect for the following conditions:

  1. Correct routing of the spark plug wires-Incorrect routing may cause cross-firing.
  2. Any signs of cracks or splits in the wires.
  3. Inspect each boot for the following conditions:
    • Tearing
    • Piercing
    • Arcing
    • Carbon tracking
    • Corroded terminal

If corrosion, carbon tracking or arcing are indicated on a spark plug wire boot or on a terminal, replace the wire and the component connected to the wire.

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