Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Frankencarb?
Shiny:
I am going through my carb (again) to address nozzle drip/flooding that happened the last two times I tried to get the car running.
Hoping I may finally have some insight...
Reading this thread: https://cliffshighperformance.com/simplemachinesforum/index.php/topic,4696.0.html, I noticed another member with the same carb says it had NO BYPASS AIR in stock form.
So..
1. Does a stock 7029240 have bypass air?
Mine (29240 MD) has the holes circled in the image, which I assume is for bypass air.
2. How would I know if my carb has the wrong baseplate?
The only number I could find is incomplete - attached image.
The only reference I have for the part numbers is a Delco Bulletin. It lists 7036596 for the baseplate assembly.
3. Is my understanding correct? I think if there was too much idle air, I would have to add more fuel to achieve an idle. It is possible then, that I had to increase the idle speed screw and opened the primary blade too much, causing my nozzle drip.
4. If all this is explaining my issue, can I just plug these bypass holes or should I get the "correct" baseplate?
Mike
Shiny:
Woops...
I posted the wrong baseplate number. It is clearly 38752.
Shiny:
I found an eBay listing that shows a baseplate without bypass air holes:
https://www.ebay.com/itm/354145578251?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=bhZJb1MCTAe&sssrc=2349624&ssuid=w1_2LomQQYu&var=&widget_ver=artemis&media=COPY
Still hoping someone can tell me if I have the wrong baseplate and need to lose the bypass air.
Image below is from the eBay 7029240
Shiny:
And another on eBay without bypass air:
https://www.ebay.com/itm/124797535399?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=gE-X7iF_Qlu&sssrc=2349624&ssuid=w1_2LomQQYu&var=&widget_ver=artemis&media=COPY
Kenth:
I have found Buick startes using bypass air in some 1970 455 and all 1971-74 455 Qjets, none before that, and no 350 Buick uses bypass air.
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