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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 80 (Engine Controls Self-Diagnostics - 5.0L & 5,7L) >> Diagnostic Tests >> DTC P0300-P0308: Engine Misfire Detected >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 5

    The misfire is considered random on all cylinders if the misfire seems to move to different cylinders while you view the misfire counters in the misfire data list.

  2. 6

    The misfire is considered consistent if the misfire consistently occurs on the same cylinders.

  3. 7

    The spark should be consistent when you test the spark at the spark plug wires. The presence of few sparks then nothing indicates no spark.

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