GM Service Manual Online
For 1990-2009 cars only

The ignition system components covered in this section include:

    • Spark Plugs
    • Secondary Ignition wiring
        All engines have Electronic Ignition (EI) Systems. For overall information and diagnosis of the ignition system, refer to Electronic Ignition (EI) System Diagnosis in Engine Controls. If the diagnosis leads to checks of spark plugs or secondary wiring, refer to the information in this section for those components.
        This section also covers the removal and installation of spark plugs as called for in Maintenance and Lubrication.