Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Rebuilt Carb

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gikent:
I just installed a Cliff's rebuilt carb that was done a couple of years ago. I am trying to dial it in but have a miss at just off idle up until 1/2 - 3/4 throttle. WOT is great. Idle is fine also. I have tried to adjust the APT throughout a wide range but cannot get it smooth.

Cliff Ruggles:
Need more info.  Carburetor number, what is was set up for, and what you are using it on?.....Cliff

gikent:
Cliff, it is a 17057274 rebuilt for and used on a 455, 9.0 compression with XE262 cam. No porting on the 6X heads. Cast Iron intake. 2004r trans with a 3.42 rear.  Stock convertor, Idles with a 11 in vacuum in drive. All this in a 1969 Firebird.

Thanks
Guy

Frank400:
11 inches of vacuum seems kind of low for such a small camshaft.  Are you sure there isn't a vacuum leak somewhere ?

gikent:
That was what I was thinking also. I did the propane check and did not get any change in idle speed. I an going to check again this weekend. I will also check the brake booster, but it is new.

Thanks
Guy

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