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.

Visual check
- Vacuum hoses for splits, kinks and proper connections as shown on vacuum hose routing diagram 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 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 ALDL tool if available. Normal coolant temperature is 85°C-100°C (185°F-215°F).

- Low coolant:
- Loose fan belt
- Restricted air flow