Anti-dieseling solenoids are also referred to as, `throttle stop' or `idle stop' solenoids.
- Turn the ignition key ON and open the throttle. The solenoid plunger should extend (solenoid energized).
- Turn the ignition OFF. The plunger should retract, allowing the throttle to close.
With the anti-dieseling solenoid deenergized, the carburetor idle speed adjusting screw must make contact with the throttle shaft to prevent the throttle plates from jamming in the throttle bore when the engine is turned off.
If the solenoid is functioning properly and the engine is still dieseling, check for one of the following:
- High idle or engine shut off speed.
- Engine timing not set to specifications. Correct any of these problems, as necessary.
- If the solenoid fails to function as outlined in steps 1-2, disconnect the solenoid leads; the solenoid should de-energize. If it does not, it is jammed and must be replaced.
- Connect the solenoid to a 12 volt power source and to ground. Open the throttle so that the plunger can extend. If it does not, the solenoid is defective.
- If the solenoid is functioning correctly and no other source of trouble can be found, the fault probably lies in the wiring between the solenoid and the ignition switch or in the ignition switch itself.