Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Electric Choke Issues?

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TravisUT:
I was waiting for a hand vacuum pump from Amazon, and of course the 2-day shipping turned into 3-day, so it won’t be here until tomorrow.  >:(

If I understand correctly, when applying the vacuum to the pull of, I want it to just crack open; and when pushing the pull off linkage all the way in, the full gap should be 1/4”…right?

quadrajam:
I should have been more clearer, you will fully retract the pull-off which should slightly crack the choke blade open then push lightly on the CHOKE BLADE for the 1/4 in. gap betwix the top of the choke blade and the air horn. adjust with the phillips screw on the pull-off.
You can do this with mouth vacuum and a piece of hose. doesnt take much.

Kenth:
This may help some.
Measurement is usually around .160"-.180" at upper/rear end of choke blade for M4 Qjets.

TravisUT:
Ok...I think it's all adjusted now. Got the choke and pull off's set, and it seems to be running good. Didn't spit any wet black spatter, so that's a step in the right direction. Once it was running, I hooked a vacuum gauge up to the big manifold port on the front-bottom of the carb, and adjusted the idle mixture screws to vacuum. Both are set about 3 turns out, and I'm getting 18 inches of vacuum. Is that good/ok?

I'm still getting a bit of smoke, but only on revving; idle and drive is ok with no smoke. I pulled a plug and it was all black. I just replaced those plugs a couple of weeks ago, but I suspect the out-of-tune was causing issues, yes? I don't want to replace them until we're confident the underlying cause is fixed...thoughts?

quadrajam:
Nows the time to set/check all aspects of ignition timing, then get it out on the road
and put some miles on it. That may burn off some plug fouling.
18 inchs of vacuum is probably good. @ what rpm? Ported or manifold vacuum?
HEI distributor?
You may still have some cold start tuning to do but sounds like its close.

QJ

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