Dieseling, Run-On

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Dieseling, Run-On

Checks	Action
DEFINITION: The engine continues to run when the ignition is turned OFF, but usually runs very roughly.
Preliminary Checks	Refer to Important Preliminary Checks in Symptoms - Engine Controls .
Fuel System Checks	Test for proper EVAP Purge system operation - KL6 only. Test the fuel injectors for leakage. Inspect for correct throttle blade adjustment, if applicable. Perform the fuel system diagnostic procedure. Refer to Fuel System Diagnosis .
Additional Checks	If the engine continues to run smoothly when the ignition is turned OFF inspect for the following: Proper ignition switch adjustment A short to voltage in the PCM ignition feed circuit.