Have to close one air adj

[Don]

Friends 8ba engine say one air jet is almost closed off to get it to idle correct,it this carb problem or look somewhere else,engine has recient rebuild ..this guy is 90 yrs old but still going strong,,,
To test carb ,could a plate be put on btm of carb ,apply vac and move jet to see what happens,,,?. Always looking for a easy way,,,,

[Mart]

To me this says the carb is running rich for another reason and does not need the normal supply of fuel from the mixture screw.

If you can fix what is causing the alternative fuel source, it will then need, and respond to the mixture screw.

Float ruptured.
Needle valve not seating.
Power valve ruptured.
Power valve not seating.
Lower and middle carb bodies not flat causing vac leak into power valve chamber.

All of the above can cause an over rich condition in a 94.
The last three can cause an over rich condition that is not visible from outside and could cause your friend's problem.

Mart.

[Charlie ny]

In my experience 'unwelcomed' air is entering the mixture usually the culprit is excess
clearance between the throttle shaft and the base........wear in either or both. Mart
brings additional culprits to our attention.

Charlie ny

[frnkeore]

An old test for vacuum leaks, is to quirt oil around the different area's, such as throttle shafts and the base.

The engine will smooth out, for a short time, if the oil gets in a leak.

Frank

[19Fordy]

Have you considered rebuilding the carb or having another Fordbarner who specializes in that field rebuild it?

[Don]

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He got it off today and working on it,,,,hope he finds something!!!