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Ignition System

  1. To properly check the spark plugs or to correct a condition, refer to the following procedures:
    • Ignition System Specifications. Go to IGNITION SYSTEMS in SERVICE & ADJUSTMENT SPECIFICATIONS - CAVALIER & SUNFIRE article or IGNITION SYSTEMS in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article.
    • Spark Plug Inspection. Go to SPARK PLUGS under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
    • Spark Plug Replacement. See appropriate REMOVAL & INSTALLATION article.
  2. Remove spark plugs and check for correct heat range, wet plugs, cracks, wear, improper gap, burned electrodes, heavy deposits and verify that the spark plugs are of the correct type.
  3. Check for proper ignition voltage output with the HEI Spark Tester (J 26792), or equivalent.
  4. An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
  5. Determine the cause of the fouling before replacing the spark plugs.
  6. Check for damaged or misaligned spark plug boots.
  7. Check the Ignition Control Module (ICM) module for proper ground connection.
  8. Monitor the MISFIRE CURRENT COUNTERS while driving the vehicle in the conditions that the symptom occurred. If a misfiring cylinder can be located, use the DTC P0300 diagnostic procedures for diagnosis. Go to DTC P0300: ENGINE MISFIRE DETECTED under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
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