Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

weird off-idle hesitation

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Marx3:
It feels exactly like a lean stumble, but it appears it aint :-) Yes, the pump shoots simultaneous with the throttle moving. Nothing wrong anywere it seems.

77cruiser:
Have you tried taking the vacuum advance out of the equation? Just unplugging it just to see what happens.

Marx3:
Yup, I ran ported before and it makes no difference if it I shooed up to full or ported

Cliff Ruggles:
I've ran into this problem a couple of times with "low" compression engines and bigger than stock cams.  You get a very momentary hesitation from going rich right off idle.

Haven't seen this with higher compression.  You may simply need to limit fuel to the mixture screws and transfer slots slightly.

I'd also hook up a vacuum gauge and see where the vacuum is at the same moment you get the "stumble".  The power piston may be coming up if the spring under it is too strong.....Cliff

Marx3:
Hmm I haven't given the pp spring any thought. I'll try and mess with it.
I'll report back.

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