Weber carb secodaries not enough gas??? - Jeep Wrangler Forum
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Old 04-04-2012, 01:17 PM   #1
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Weber carb secodaries not enough gas???

Help found out my secondaries not getting enough gas and it's bogging down when I try to accelerate or go up a hill or even leaving a red light how do I fix this problem???

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Old 04-04-2012, 02:24 PM   #2
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take it apart and clean out the secondary fuel ports?

best guess with that little amount of detail... got 1990 4.2 Liter 258 by looking at your profile, but does it have the stock 2BBL or a weber 4? stock intake and adapter or offy?

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Old 04-04-2012, 03:06 PM   #3
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Its a Weber 34 DGEC brand new only 3 weeks old and before that i had the same weber on there and the both did the same problem but im not a carb expert and i called weber before they sent me the new carb and told me they put the right jets for my jeep well i couldnt take it anymore and i brought it in to a mechanic and he said ur not getting enough fuel when the secondaries open i believe the adapter is on there cause it came with the first weber package that i got the guy working on it wants to put a holley on but i cant keep spending money on this i need to know whats right. it originally had a carter then i got the weber 34 dgec and this is my problem
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Old 04-04-2012, 03:24 PM   #4
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some folks might tell you it's too much carb, but you should be able to run a 4BBL on an offy intake without any issues. I have one in my DJ, and while it's rare for the secondaries to even engage, it certainly doesn't bog down or have any power issues...

At a guess, I'd say you just don't have enough manifold vaccum (that's really the only logical reason 2 different carbs would be lacking fuel in the secondaries), and if it's a stock intake with an adapter, then the odds go way up on that. Offenhauser has a 4BBL intake that would most likely fix the issue (and AFAIK, they are the only ones that make one), or you could find yourself a 2BL carb. Either one should help, as long as you get the adapter plate gone. those things are a pain

if there's no adapter and it's an offy 4BBL intake, then you have a vaccum leak somewhere or some other issue.
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Old 04-04-2012, 03:35 PM   #5
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hmm i just dont understand why they say its perfect for the stock 258 with a stock intake manifold when its bogging out when im trying to leave a freaking red light lol i dont even know what to believe
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Old 04-04-2012, 04:03 PM   #6
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wait... scratch that...

34 is a 2BBL carb. I was thinking the wrong kind of secondaries

have you checked for vacuum leaks? if it isn't a leak somewhere, then it has to be something inherent to that carb to make two different ones do the same thing, but wrong jet size is the only thing that makes sense to me, and if weber says the jets are correct, then I have no clue.
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Old 04-04-2012, 04:08 PM   #7
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idk man all i know is people are having the same issue as me kind of when i search forums about the 34 DGEC and it looks like most jeepers are liking the MC 2100 MC 2150 which looks like im going to have to work double time at the fire station to get a carb thats worth a shit
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Old 04-12-2012, 01:42 PM   #8
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Ok so I had a mechanic work in it and he thought they weren't getting enough gas so he opened up everything he could to give it gas but when I got it back it ran even worse so I tighten up the pressure reg and leaned out the fuel mixture screw I think I leaned it I turned it clockwise till it had just a little stumble an it runs even better than before I brought it in... What is going on ? Also after I brought it in when I got it back if I punched the petal to the floor I had a backfire in the exhaust pipe what caused that
Help?!??!
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Old 05-01-2012, 09:10 PM   #9
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you're running rich man. idk if you have this fixed by now or not, but try leaning it out some more. im no expert on carbs so unfortunately i cannot help you more than telling you that. also, try putting this in the yj forum vs the comm/elec forum. might get some more helpful advice. good luck!

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