GM Service Manual Online
For 1990-2009 cars only

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.
  2. Incorrect routing may cause cross-firing.

  3. Any signs of cracks or splits in the wires.
  4. Inspect each boot for the following conditions:
  5. • Tearing
    • Piercing
    • Arcing
    • Carbon tracking
    • Corroded terminal

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