GM Service Manual Online
For 1990-2009 cars only

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