Dieseling, Run-On. Pontiac Aztek

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2001 🢒 Aztek - AWD 🢒 Engine 🢒 Engine Controls - 3.4L 🢒 Dieseling, Run-On

Inspection/Test

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

•	Refer to Diagnostic System Check - Engine Controls .

•	Refer to Intermittent Conditions before starting.

•	Search for bulletins.

Fuel System

•	Test the fuel system circuits for proper operation. Refer to Fuel Pump Electrical Circuit Diagnosis .

•	Test for low fuel pressure. Refer to Fuel System Diagnosis .

•	Test for faulty fuel injectors. Refer to the following test procedures:

-	Fuel Injector Balance Test with Special Tool

-	Fuel Injector Balance Test with Tech 2

-	Fuel Injector Solenoid Coil Test

•	Inspect for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .

•	Inspect for fuel in the pressure regulator vacuum hose.

•	Ensure each injector harness is connected to the correct injector and/or cylinder.

Additional

Test for a short between battery positive voltage and any of the ignition feed circuits. Refer to Wiring Repairs in Wiring Systems.