Dieseling, Run-On. Buick Regal 1998

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1998 🢒 Regal 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 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 the Powertrain On Board Diagnostic (OBD) System Check .

•	Refer to Symptoms for Important Preliminary Checks and Visual/Physical Checks.

Fuel System

Check the fuel injectors. Refer to the following procedures:

•	Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F)

•	Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Outside 10-35 Degrees C (50-95 Degrees F)

•	Fuel Injector Balance Test

Additional Check(s)

Check for short between B+ and any of the ignition feed circuits. Refer to Wiring Repairs in Wiring Systems.