Dieseling, Run-On. GMC Truck GMC C-Series Medium Duty Truck B7 1999

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Controls - 7.4L 🢒 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 Symptoms .

•	Search for bulletins.

•	Check the PCM grounds for being clean, tight and in their proper locations. Refer to Wiring Repairs in Wiring Systems.

Fuel System

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