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Spark Plug Wire Inspection

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Spark plug wire integrity is vital for proper engine operation. A thorough inspection is 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
    • Corroded terminal

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

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