Throttle solenoid problem
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Throttle solenoid problem
Hey again all. Issues today. My throttle solenoid on my 78 f150 351m 2brl carb will not retract. As soon as it starts the rod extends and pushes the throttle up a bit. My issue is that it never retracts and I don't have a clue how to stop that other than disconnect power. With winter coming it would be nice to have this working . Any ideas or an explanation of where this gets powe would be very helpful . Thanks guys.
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Joined: Apr 2009
Posts: 14,333
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From: Stanley, VA
Are you saying that when you turn the engine off, the solenoid stays extended?
If the solenoid extends when the engine is started and retracts when the engine is shut down, that's the way it's supposed to work.
This is an anti-diesel solenoid. Its function is to allow the throttle plate to close past idle when the engine is shut down to prevent run-on (dieseling).
If the solenoid extends when the engine is started and retracts when the engine is shut down, that's the way it's supposed to work.
This is an anti-diesel solenoid. Its function is to allow the throttle plate to close past idle when the engine is shut down to prevent run-on (dieseling).
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Yeah, now days fuel injection has eliminated any dieseling problems the emission controlled, carbureted engines had back in the day.
Today, you kill the ignition, you also shut down fuel flow so there's no tendency to run on like the old engines had.
The anti-diesel solenoid was, at best, a band-aid solution.
Today, you kill the ignition, you also shut down fuel flow so there's no tendency to run on like the old engines had.
The anti-diesel solenoid was, at best, a band-aid solution.
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