Cliff's Quadrajet Parts and Rebuild Kits
Quadrajet Problem Solving => Dialing in your rebuilt Quadrajet carburetor => Topic started by: steve s. on May 09, 2018, 09:12:36 AM
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Cliff and others. My quadrajet is running very rich on startup. It is also taking a little longer than I think it should go come off high idle.
Any suggestions for tweaking? Carb has your electric choke conversion too.
Thanks.
Steve Suppa
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Ah ... did you try adjusting the choke?
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Yes, I set it leaner but did not notice a difference. It runs and idles great once it kicks down.
Suggestions?
Thanks.
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Adjust the pulloff so it opens the choke a bit more at startup.
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adjusting it "leaner" does not lean it out. It reduces the "time" the choke stays on. 77 cruiser has the plan.
Frank.
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O.K. Thanks for the suggestions/explanations. Can either of you describe how I properly adjust the choke pulloff?
Thanks again!
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Carb number? Front or rear pulloff?
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Correct on the choke having nothing to do with running rich right at start-up. The pull-off controls the angle the choke flap is opened to. They are all adjustable, early models may require bending parts, later models turning a Phillips head screw.......Cliff
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Did some of the rear pulloffs have a screw to adjust?
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Carb number 17058266. Has both front and rear pull offs.
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There is an adjustment screw on the front pull-off so that one is very easy to adjust.
Some rear pull-offs also have an adjustment screw if they are the double acting variety and control both functions. You still may find yourself bending the linkage on them as they also control the secondary air door.....Cliff
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Thanks Cliff. Can you explain how exactly it gets adjusted? Not sure which way it gets turned and what result I should be looking for.
Thanks.
Steve
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Turning the P/O adjustment screw clockwise will richen it up (not open as far), CCW will lean it up as it will open further.
It needs to be adjusted on a cold start-up, and you can fine tune the fast idle speed screw as well for your liking. The speed screw is on the end of the throttle shaft under the choke housing......Cliff
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O.K. Cliff, got it. Thanks for the help!
Steve
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Still having an issue with rich starts and getting the high idle to kick down. This carb has two pulloffs, front and rear. Should the rear pull off be hooked to vacuum too? I was told to just cap off the rear pull off. Is this correct?
Thanks again for your help.
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The secondary pull-off is not needed on that carb number, it's simply there as a back up in case the primary pull-off fails.
You have full control of the fast idle speed on a cold start-up, and the angle of the choke flap to set it rich or lean as well. Remember that CCW on the pull-off screw will lean it up at start-up, CW closes the flap more and makes it richer.
It usually takes a couple of cold starts to nail down the best settings.
After a minute or so running the choke coil will heat up enough to open the choke flap some and allow the fast idle cam to drop to a lower position.
If you want it off sooner turn the choke housing CW, stay on later CCW.
Make small adjustments with the choke housing, a little goes a long ways, but the flap should be fully open in about 2-3 minutes and fast idle cam will drop out of the way as well......Cliff
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Hi Cliff,
Thanks once again for your very detailed instructions. I will give your suggestions a try. I really appreciate it.
Steve