Dieseling/Run-On

Definition: Engine continues to run after key is turned "OFF", but runs very roughly. If engine runs smoothly, check ignition switch and adjustment.
^ Visually (Physically) Check:


- Vacuum hoses for splits, kinks and proper connections as shown on Vehicle Emission Control Information label.


- Carburetor choke, throttle linkage and fast idle cam for sticking.


^ Check carburetor choke, vacuum break linkage, throttle linkage and fast idle cam for proper adjustment..


^ Check cruise control for proper adjustment.

^ Check engine idle speed. See Vehicle Emission Control Information label.


^ Check ignition timing. See Vehicle Emission Control Information label.


^ Remove carbon with top engine cleaner. Follow instructions on can.


^ Check for engine overheating. Use ALCL tool if available (Calif). Normal coolant temperature is 85~C-100~C (185~F-215~F).


- Low coolant:


- Loose fan belt


- Restricted air flow


- Inoperative electric cooling fan, or fan clutch.