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

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Fuel System

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

Additional Check(s)

Check for short between battery positive voltage and any of the ignition feed circuits. Refer to Wiring Repairs in Wiring Systems.