Dieseling, Run-On. GMC Truck GMC K Sierra

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Sierra - 4WD 🢒 Engine 🢒 Engine Controls - 4.8L, 5.3L, and 6.0L 🢒 Dieseling, Run-On

Checks

Action

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

Preliminary Checks

•	Refer to Important Preliminary Checks Before Starting in Symptoms .

•	Search for bulletins.

•	Check the PCM grounds for being clean, tight and in the proper locations. Refer to Engine Controls Schematics .

Fuel System

Inspect the injectors for a leaking condition. Refer to Fuel System Diagnosis for the proper procedure.