I have a '72 390 2bbl motorcraft carb and the white plastic linkage between the choke and the throttle is broken. I think it controls the increase in throttle when the choke is closed/cold. Is this part replacable? The local Napa says no...

I hope that explains the part - here is a picture pre-break:

The part is located between the choke and the carb body on the passengers side - it attaches to the back of the choke and links up to the throttle contol, and has a small hex screw sticking out of the top of it. I'ts hard to see in this picture, but you can see it if you know what I am talking about.

 

This was mentioned a couple of weeks ago.

I think a guy found on ion the H.E.L.P. blister pack section of his local parts store.

 

go 2 a junkyard an find a carb an just repace the part

 

That's the fast-idle arm. It holds the fast idle linkage in sync with the choke so that the fast idle runs as a function of how much the choke is open. They get old and break. You might try the HELP stuff like Dennis said; or you could try eBay or maybe some of the parts catalogs.

 

Thanks guys - Mi1ion haven't been on the site for a few weeks and you know how fast the topics rollover. Fast Idle Arm...good to know the name of the part. I will check the HELP parts because I want a new part if possible. I'm surprised it's not a part that is sold anymore, of course nothing surprises me with a truck thats older than I am. Thanks again guys.

 

That piece of white plastic linkage is the fast idle cam.

D5AZ-9597-A .. Fast Idle Cam (Motorcraft CM-2015)

Fits: All Ford 2V carbs 1971/79 EXCEPT the Variable Venturi 2V carbs used on some 1977/79's.