Ignition System Checks

To properly inspect the spark plugs or to correct a condition, refer to the following procedures:

• To properly inspect the spark plugs or to correct a condition, See IGNITION SYSTEMS in SERVICE & ADJUSTMENT SPECIFICATIONS - ION & SATURN "L" SERIES article and SPARK PLUGS under IGNITION SYSTEMS in REMOVAL & INSTALLATION - ION article.
• Remove spark plugs and inspect for correct heat range, wet plugs, cracks, wear, improper gap, burned electrodes or heavy deposits. Verify the spark plugs are of the correct type.
• Check for proper ignition voltage output using Spark Tester (J 26792).
• An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
• Determine the cause of the fouling before replacing the spark plugs.
• Check for damaged or misaligned spark plug boots.
• Check the Electronic Ignition (EI) module for proper ground connection.
• Monitor the Misfire Current Counters while driving the vehicle in the conditions that the symptom occurred. If a misfiring cylinder can be located, use DTC P0300 for diagnosis. See DTC P0300: ENGINE MISFIRE DETECTED under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ION article.