Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Acceleration issue (Quadrajet on a ‘75 Cadillac Eldorado)

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Benji808:
Was encountering the same issue just a little bit today…~70mph going up a hill. Doesn’t seem nearly as bad or as constant but was noticeable. Any other ideas, fuel pump, or carb adjustment?

Kenth:
Hesitation/surge at that speed, mostly due to the ethanol in todays fuels, can be cured with .002" larger main jets.
You can also raise the APT under the brass plug in front of the air horn 1-2 turns and see if that helps some.

Benji808:
Thanks, Kenth! That could make sense, since I've been filling up with ethanol-free fluid, but today had to put some of the newer stuff in in. I also think there is an issue with my kickdown switch which may be impacting acceleration.

Thank you for the insight! Hopefully I can resolve soon.

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