Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Hot outside & bog on take off
vertbird:
I have a Cliff Qjet that he built for me years ago. I don't drive it much but I've started driving it more in the summer. The car runs well in cooler temps (<75 degrees outside) but once the ambient temp hits 80 and humidity is up, the car is a slug off the line. Is the secondary spring set too light for hot weather or do you think it's something else?
Cliff Ruggles:
What is the carburetor part number?
Application, engine/drivetrain/vehicle specs?....
vertbird:
Hi Cliff,
Thanks for responding, the carb is #17056274. It's on a 76 Trans am 400 with TH350 & 2.73 rear gear. 6x-8 heads that Kauffman reworked but still at 7.9:1 running the crower 60240 cam.
Cliff Ruggles:
Those are excellent units, same carb I used on my own engines for over 40 years and never had a single issue with it.
May be heat related but keep in mind that a "low" compression 400 build with a 210/222 @ . 050" cam plus 2.56 gears isn't going to be much faster off the line than my garden tractor anyhow. Hot/humid temps raise the DA and you loose a LOT more power.
If it's developing a hesitation/stumble or bog going quickly to full throttle you might want try tightening up the spring for the air flap shaft just a tad to see if it helps.......
vertbird:
Thank you Cliff !
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