Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Qjet Hunting at idle
Frank400:
Good news,
let us know the outcome and the reason it was happening.
By the way, from what I recall, this carb number has a very short transfer slot that is 100% OVER the throttle plate, with none showing under, right ? Just out of curiosity, what size idle air bypass did you drill ?
Frank.
buicksstage1:
I left them at factory I think they were .105 I was wondering if it should be restricted?
buicksstage1:
--- Quote from: Frank400 on April 11, 2018, 03:34:44 AM ---Good news,
let us know the outcome and the reason it was happening.
By the way, from what I recall, this carb number has a very short transfer slot that is 100% OVER the throttle plate, with none showing under, right ? Just out of curiosity, what size idle air bypass did you drill ?
Frank.
--- End quote ---
The idle mixture screws do nothing, The throttle plates were to high on the transition slots so I drilled a small hole in them so I could close hem up a bit and still no response. This is the first time I have had a tuning issue with a Qjet. Must be rusty lol
buicksstage1:
No One? No idea's???? As per Cliffs book used the build 3rd recipe on page 113 114/ Would appreciate any help.
Cliff Ruggles:
Use the bypass system in the baseplate IF you are off the idle system and pulling in enough idle fuel from the transfer slots and boosters AND no control with the idle mixture screws.
Unless I missed it someplace no mention of how my idle bypass air is being used?
You can also pull a smaller manifold vacuum hose to duplicate some bypass air, lower the idle speed screw, and see if it helps some before actually drilling anything.
Also verify that the distributor isn't adding any timing below 1000rpm's or it may "hunt" some......Cliff
Navigation
[0] Message Index
[*] Previous page
Go to full version