Dieseling, Run-On. Buick LaCrosse 2007

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2007 🢒 LaCrosse 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Dieseling, Run-On

Inspections

Action

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

Preliminary

•	Refer to Important Preliminary Checks Before Starting in Symptoms - Engine Controls .

•	Search for bulletins.

•	Verify that the engine control module (ECM) and ECM bracket fasteners are at the correct torque.

•	Inspect the engine control system grounds for being clean, tight, and in the correct locations. Refer to Power and Grounding Component Views and Engine Controls Schematics . Ensure the resistance between the ECM housing and the battery negative cable is less than 0.5 ohms.

Fuel System

Test the fuel system for the following conditions:

•	High fuel system pressure

•	Leaking fuel injectors

For more information, refer to Fuel System Diagnosis .