Dieseling, Run-On. GMC Truck GMC C Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1997 🢒 GMC C Pickup - 2WD (CNG) 🢒 Engine 🢒 Engine Controls - 5.0L and 5.7L 🢒 Dieseling, Run-On

Checks

Action

DEFINITION: The engine continues to run (but runs very roughly) when the key is turned OFF. Inspect the ignition switch and adjustment if the engine runs smoothly.

Preliminary Checks

Refer to Symptoms .

Fuel System Checks

•	Inspect the Evaporative Emissions (EVAP) system and fuel tank venting.

•	Inspect the fuel injector(s) for leakage.

•	Inspect for excessive idle speed.

•	Perform a fuel system diagnosis. Refer to Fuel System Diagnosis .