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31
Quadrajet Carb Talk and Tips / Re: pull over enrichment tubes??
« Last post by Cliff Ruggles on June 06, 2025, 12:08:13 AM »
If used the primary POE tubes were much longer.  I would remove those tubes from the current location and install secondary POE tubes in the correct location.  I've never found that primary POE works well on the later units so seldom use it.....
32
Quadrajet Carb Talk and Tips / Re: Early non APT primary rod set up.
« Last post by Cliff Ruggles on June 06, 2025, 12:02:50 AM »
Correct, jets and metering rod are NOT the correct way to tune the idle system.  Even so I see folks trying to do this.  Just yesterday I took a call from a guy who was clear down to .064" main jets with 44B rods trying to cut-off some idle fuel because his A/F meter showed WAY rich at idle. 

I told him that he needed to look at IFR's and DCR's, plus the IAB's, and that I couldn't help without a carburetor part number or specifics on those items.  I got neither one so moved on to better things......FWIW....
33
Quadrajet Carb Talk and Tips / Re: Early non APT primary rod set up.
« Last post by Kenth on June 05, 2025, 12:59:02 AM »
There is no APT on Pontiac Qjets until the 1975 M4 units, however there is an conical off-idle adjustment screw under the triangular washer on air-horn wich affects the upper idle circuit air-bleeds on 1969 and earlier units and affects the upper main circuit on 1970-74 units.
Changing rods (non-B suffix) and/or jets is the way to tune a Pontiac Quadrajet if needed.
I have found this is seldom needed if the idle circuit is properly modified for todays fuels.
Also, changing main jets/rods will NOT help the idle circuit as the idle circuit is a stand alone circuit with its own jets and airbleeds.

HTH
34
Quadrajet Carb Talk and Tips / Re: Early non APT primary rod set up.
« Last post by jim71400 on June 05, 2025, 12:13:42 AM »
I think you can knock out a plug in front of base/throttle plate  and there is screw in there which is an early style of APT adjustment????? Dont think it needs packing??? Could be wrong.
35
Diagnose a Quadrajet carburetor problem / Re: 17085292 Idle Speed
« Last post by Raoul Ross on June 04, 2025, 06:52:57 PM »
So the more I dig into this neglected truck the more I'm finding. The owner has been driving it 'As Is' because his car has been in the body shop for a while (Hail Damage). Finally got it for a few days and found the plugs hadn't been changed for a long time (gap ~.060) a couple plugs wires failing and the centrifugal advance wasn't doing anything, totally stuck. Was able to free it up without removing the dizzy. New plugs, wires, cap and rotor and it runs so much better now.

Next time I get it, I'll be doing the carb. Rebuild kit (from Cliff's, of course) and primary throttle shaft bushings. Bought a Ultrasonic cleaner and picked up some highly rated (aren't they all ;P) Amazon cleaner. It works pretty good, as good if not better than the Berryman stuff.
36
Quadrajet Carb Talk and Tips / Re: what carb to build
« Last post by novadude on June 02, 2025, 05:26:16 AM »
Quote from: Kenth on May 30, 2025, 11:36:00 AM
I use to thread the EGR bleed off hole for a 2-56 set screw, if a ported source for ignition vacuum advance is needed.

That's a good solution. 
37
Quadrajet Carb Talk and Tips / pull over enrichment tubes??
« Last post by jim71400 on June 01, 2025, 01:58:49 AM »
Hi, I recently bought a q-jet from a swap meet off a 1976 Pontiac # 17056564 which I plan on rebuilding. It looks like someone has been in there and I’m not sure what is supposed to be going on inside the air horn. The main well bleed tubes are correct but it looks to me as though the secondary accelerating well tubes have been put in the holes for the pull over enrichment tubes as they are in very loosely and look like secondary accel tubes. The main thing I’m not sure about is should this carb have pull over enrichment tubes? And any ideas of the height they should be poking out? I think I have read the POE tubes are not necessary, if so do I just leave them out?
Any help will be appreciated
Thanks
38
Quadrajet Carb Talk and Tips / Re: what carb to build
« Last post by Kenth on May 31, 2025, 11:45:45 AM »
Yes, next to the slot in passenger side primary bore.
39
Quadrajet Carb Talk and Tips / Re: what carb to build
« Last post by BAMiller on May 31, 2025, 05:15:17 AM »
Is the bleed hole in the baseplate?
40
Quadrajet Carb Talk and Tips / Re: what carb to build
« Last post by Kenth on May 30, 2025, 11:36:00 AM »
I use to thread the EGR bleed off hole for a 2-56 set screw, if a ported source for ignition vacuum advance is needed.
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