GM Service Manual Online
For 1990-2009 cars only

Dieseling, Run-On

Checks

Action

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

Preliminary Checks

    • Refer to Symptoms .
    • Search for service bulletins.

Fuel System

Check the fuel injectors. Refer to Fuel Injector Balance Test .

Additional Checks

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