Fellow Ford Drivers,
I have asked for help in the past and I have another question. I have a
1978 Granada with a 250 inline six with auto transmission. I have a
Carter YFA carburetor. There is a dashpot on the carburetor. Can
anyone tell me what the dashpot is used for? I can tell that the
plunger is pushed in when the throttle is closed and the plunger is
released when the throttle is opened. There is a wire on the end of the
dashpot so I was wondering what this signal tells the engine to do or
Thanks in advance
There are a couple of things these solenoids were used for in the 70's:
1. Idle stop. To prevent dieseling, or run on, the solenoid
de-energized when the key was turned off to close the throttle more.
This let less air in, and prevented the engine from running on. Engine
idles were beginning to get higher and higher in the 70's to lessen smog
production from the engine, and the high idles were causing run on. So,
to prevent run on, they added a solenoid that would close the throttle
more when the ignition was shut off.
2. Air conditioning. Sometimes, air conditioners load an engine so much
at idle that the car won't stay running. Sometimes these idle solenoids
were added to open the throttle more when the air conditioner was turned
I'm not 100% sure which yours is for, but these were common usages back
Gerard's Automobile Book, Video, and DVD Store
The dash pot is used to control the speed the throttle plates close when you
suddenly release the throttle. If the plates close too fast, the engine can
stall. The electrical side of the dash pot is to pick up the idle when a load is
place on the engine like A/C. It has also been used as an aid to the choke/fast
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