Dieseling, Run-On. Pontiac Grand Prix 1999

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1999 🢒 Grand Prix 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 Dieseling, Run-On

Checks

Action

DEFINTION: 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 Important Preliminary Checks.

•	Refer to Visual/Physical Checks.

Fuel System

Check the fuel injectors using the following test(s):

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

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

•	Refer to Fuel Injector Balance Test .

Additional Check(s)

Check for short between B+ and any of the ignition feed circuits. Refer to Fuse Block Schematics .