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Author Topic:   Quadrajet
Dirt Freak

Total posts: 429
posted April 11, 2005 07:29 AM  
Quadrajet runs good and strong right outa the box(autozone carb from champion)however it wont idle for nothing. It will try to idle for a few seconds and then eventully shut iff, if you keep giving it gas ever few seconds its fine. I dont want to return it cause I know its rare to get one that performs has good as this one did on track any ideas were to start, i know these carbs are suspose to be tuned from factory but I am sure that they dont take into consideration race cams and such, however I never had a problem at all getting it to idle with any other carb and lord knows i have had a bunch of quadrajunks on there lol

redneck racing
Dirt Forum Champ
Total posts: 860
posted April 11, 2005 10:51 AM  
Wrong, I manage a CSK here in Utah and as far as I know the carbs are not tuned(ours are rebuilt from Holley) adjust it for your area. Eddie

Dirt Maniac

Total posts: 167
posted April 18, 2005 06:51 AM  
the factory cannot tune your (quadrajunk) to your motor. Most of the q-jet carbs that are considered to be junk are simply owned by someone that does not know how to tune them for max performance.

Dirt Freak

Total posts: 217
posted April 18, 2005 04:22 PM  
what kind of fuel pressure do you have at idle? have you tested for vacuum leaks
at base of carb?

when you say you are giving it gas, do you mean you manually trickle gas down the carb, or are you revving it?

if the carb has been reworked:

the lower idle air bleeds may be too large.

the air bleeds that sit a top, those are located around the edge of the primary venturi, may have been drilled too large.

are there any holes drilled in the primary butterflies? that may have been drilled too large.

[This message has been edited by avila (edited April 18, 2005).]

Dirt Freak

Total posts: 402
posted April 18, 2005 05:44 PM  
The first thing I would do is put a softer powervalve spring in there. If you are running a big cam there is probably not enough vaccuum at idle to pull the powervalve down and the mixture will be too rich. If you need parts KPLugnut is a pretty good guy. He should be able to help you out.

Dirt Maniac

Total posts: 167
posted April 20, 2005 06:42 PM  
set your idle mixture (two screws front bottom corners of the carb) keep backing them out until rpms stop climbing reset your idle speed (screw on drivers side of carb that pushes the throttle open) fine tune the idle misture screws to get max rpm then turn them in 1/4 of a turn each reset idle and see how that does.

Dirt Roller

Total posts: 9
posted April 21, 2005 10:34 AM  
You got a choke on it?

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