Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Setting up the new carb--pointers?
F250 Restorer:
I have the idle bypass in both the main body beside the boosters, and in the airhorn. Should I plug one set of holes?
Cliff Ruggles:
I would make sure the vacuum supply hole to the choke housing is blocked in the main casting, even if you switched to an electric choke.
Make sure any idle bypass holes in the baseplate are blocked, no need to block them anywhere else.
Once you get full control of all the air entering the engine, you will have full control of the idle speed of the engine.....Cliff
F250 Restorer:
Thanks, Cliff. Since I'm sort of new to the QJ, can you please point out which holes to plug, and how to do it.
Thank you.
Cliff Ruggles:
The two holes closest to the idle mixture screw tips, at 1 oclock and 11 oclock in the pic. Best to tap them and install a small set screw, 8-32 or 10-32, then we can always install a drilled brass set screw later if needed....Cliff
F250 Restorer:
Cliff: Getting a tap in the right side bore is out of my ability. I suppose I could take it to a machine shop, but at this point I am not willing to do that. What I did was fill the hole with epoxy. If I need to open a hole later for more idle bypass, or the nozzles are dribbling, then I can do that. Right now I will reassemble and see how it does on my ford 300, with 250 hp.
All your help has been exceptionally valuable.
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