GM Service Manual Online
For 1990-2009 cars only

Checks

Action

DEFINITION: Engine continues to run after key is turned off, but runs very rough. If engine runs smooth, check the ignition switch and adjustment.

Preliminary Checks

    â€¢ Refer to Important Preliminary Checks Before Starting in Symptoms .
    â€¢ Refer to Visual/Physical Checks in Symptoms .
    â€¢ Search for bulletins.

Fuel System

Check the fuel injectors. Refer to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F) or to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Outside 10-35 Degrees C (50-95 Degrees F) .

Additional Checks

Check for a short between battery positive and any of the ignition feed circuits. Refer to Power Distribution Schematics in Wiring Systems .