Dieseling, Run-On. GMC Truck GMC K Sierra

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Sierra - 4WD 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Dieseling, Run-On

Checks

Action

DEFINITON: The engine continues to run when turn the key OFF, but runs very roughly. If the engine runs smoothly, check the ignition switch and adjustment.

Preliminary Check

Refer to Symptoms .

Fuel System Checks

•	Check the Evaporative Emission (EVAP) system and fuel tank venting.

•	Check the fuel injector(s) for leakage.

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