Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
high rpm issue on rebuild quadrajet
rytari:
no, i think thati cant be 100% positive sure about thati have no leaks... anyway i got 22 hg vacuum but thats approx 7-900 rmp, it varies too much to say exact, intake seals are new, felpro permadry somethign labeled that i used. and also with that higly flamable brake cleaner it didnt ring a bell sprayed over intake or around carb, normaly it will affect rapidly if theres some vacuum leak.
also i have tried run it with all carb ports and that one that i used from manifold sealed tightly.
429bbf:
when you installed the carb kit was the lower gasket between the fuelbowl and the throttle plate the exact same gasket?o0r did it have a hole 1/4 size in about an inch from the back of the carb.if you have the old gasket check this can cause a internal vacumn leak.dean
rytari:
i coulnd be sure about that gasket so i took carb out and opened the base, for my eyes, both, old and new looks the same, and i also try to see some light trough the primaries but, i can say those are not completely tight, but i think those cant be any better with those plates in that bore, some light can be seen between plate and walls just near the shafts on both sides.
corellian corvette:
You know I just had the same problem tonight. When I put the baseplate back on the carb, I didn't properly align the secondary lockout lever and the choke mechanism on the passenger side of the carb. The lockout lever was on top of the choke release, preventing the choke from closing completely, keeping me on a slightly high idle. That would explain why the idle speed screw isn't contacting the throttle lever.
Cliff Ruggles:
Too much initial timing?
Idle tubes removed and cleaned during the rebuild?
Did you install a new float?
Our kits come with a new float, and the correct gaskets, filter/spring, complete accl pump, and high flow needle/seat assembly....Cliff
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