Dieseling, Run-On. GMC Truck Envoy

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2005 🢒 Envoy - 4WD 🢒 Engine 🢒 Engine Controls - 4.2L 🢒 Dieseling, Run-On

Inspections

Action

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

Preliminary

Refer to Symptoms - Engine Controls .

Fuel System

•	Inspect the evaporative emission (EVAP) system and fuel tank venting.

•	Inspect the fuel injectors for leakage. Refer to Fuel System Diagnosis

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