Dieseling, Run-On. GMC Truck Sonoma Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2002 🢒 Sonoma Pickup - 2WD 🢒 Engine 🢒 Engine Electrical 🢒 Dieseling, Run-On

Checks

Action

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

Preliminary Checks

•	Refer to Diagnostic System Check - Engine Controls .

•	Refer to Symptoms - Engine Controls .

•	Search for service bulletins.

Fuel System

Inspect the fuel injectors for a possible leak at the pintle. Refer to Fuel Injector Balance Test with Tech 2 .

Additional Checks

•	Inspect for short between B+ and any of the ignition feed circuits. Refer to Engine Controls Schematics .

•	An engine with accumulated miles could experience a build up of carbon in the cylinders. This may also show symptoms of spark knock associated with a run on condition. Use ONLY an approved cleaner that is compatible with ethanol in the fuel tank.

•	Inspect for spark plugs with an incorrect heat rage.