GM Service Manual Online
For 1990-2009 cars only

Inspection Procedure

  1. Inspect the spark plug gap. Adjust as needed.
  2. Inspect the spark plug wires for any obvious cuts, burns, or damage.
  3. With the engine ON, inspect for any arcing to ground or other components.
  4. Connect an ohmmeter to the end of each suspect wire. If the meter reads over 30,000 ohms, replace the wire.