34 DGEC Weber problems - Jeep Wrangler Forum

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Old 12-10-2011, 04:02 PM   #1
Join Date: Nov 2011
Posts: 6
34 DGEC Weber problems

I have a 34 DGEC Weber carb installed on my 1989 4.2L. I am having serious issues with it 1: starting and 2: idling. I have went through numerous combinations of adjusting the jets, idle speed, and fuel mixture and nothing seems to work. Not sure if I am missing something or not. I did, however, find a 32/36 DGEV carb with electric choke, adapters, and hardware on the internet and was curious if this would be a quick and easy install, since I already have it prepared for the 34. Any insight on the adjustments or replacement are more than welcomed! Thanks for all your help, guys.


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Old 12-10-2011, 04:11 PM   #2
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I am chasing the same issues with the same carb. I just ordered and installed a rebuild kit from Weber and still have some of the same issues. I completely changed all lines to and from the fuel tank and everything related to vacuum including manifold gaskets. It idles great but dead spot in the middle of the pedal. I also have had fuel starvation and then complete flooding. I bought the jeep about a month ago and nothing but issues with the carb. I am looking at the MC2150 now and may buy it after the holidays.

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Old 12-10-2011, 04:13 PM   #3
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Location: Littleton, CO
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dump the carb and try to drop a 4.0 in, or at least the 4.0 head. im tired of my car, nothing but troubles so im getting rid of it first chance i get
Darkproximity;Brings new meaning to giving yourself a stranger
1987 wrangler yj, I6 4.2 - UP FOR SALE!!
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Old 12-10-2011, 05:03 PM   #4
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Its the Weber. I have had mine for over a year and it has been nothing but problems. Constantly running rich no matter what I have the mix set at. I am going to be swapping to a MC2100 or 2150 soon.
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Old 12-10-2011, 09:30 PM   #5
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I'm not familiar with the MC carbs. Are they reliable? Also, with the "modification" of my intake from the OEM to the Weber, is it going to be a pretty quick and painless process to convert? I have been a GM/Chevy guy for all my life. I am not too familiar with Chrysler, more specifically Jeep. The original carb was already replaced with the 34 DGEC carb when I got my 89 Sahara a month and a half ago. It is difficult enough figuring out the layout and flow of a vehicle I am not too familiar with, even more so since it has been modified. Any recommendations on the MCs? I am really interested.
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Old 12-10-2011, 11:39 PM   #6
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Here take a look at this link: http://www.wranglerforum.com/f8/help...rs-124147.html

Motorcraft is Ford, appropriate since the YJ is a bastard mix! GM, Ford, Chrysler and AMC parts rolled into one!
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Old 12-11-2011, 10:47 PM   #7
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Location: Tulsa, Ok
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I have had the same problems with my set up as well. I finally got mine worked out. Check for vacuum leaks. I had a small leak in the gasket and another in one of my hoses. Once these were fixed it started right up and idled great, even when it's really cold out.
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Old 12-12-2011, 12:52 AM   #8
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Location: Panama City, Fl
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if you are still thinking about mc2100, this site has lots of detail and photos.


i would review several sites and choose what works best for you. if rebuild the carb yourself, here is a good step by step on that also. good luck.

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Old 12-12-2011, 01:35 AM   #9
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Similar story here. First I found that the upper adapter plate was loose. Ordered new gaskets and reinstalled with a little more loctite. Then I adjusted some more it still wasn't quiet right. Took it to a guy that used to restore foreign cars. He said that the butterflies weren't adjusted right. Runs pretty good now.
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Old 12-13-2011, 05:30 PM   #10
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Finally fixed!

Well, got tired of dealing with all the after-market modifications the previous owner installed on my YJ, so I got in touch with a bona fide Jeep guy in my area and he hook me up (for free!) with an OEM carburetor that was rebuilt with performance parts. After about an hour of reassembling, I was able to tweak it just right, along with retarding the timing via the distributor, and got it to run like it was brand new. Literally, I was considering to sell this thing as soon as I got it "drive ready," but now it is super responsive and very aggressive. I might reconsider, ha! I have never felt this thing accelerate as quickly and idle as smoothly as it does now. Anyways, I know this probably won't help anyone out if they are ever in the same situation I was. I tried to adjust and tune the Weber until I was blue in the face and found returning to the OEM carburetor was the smartest move. But thanks for everyone's tips and advice. I've got a second jeep coming, slowly making its way to my place (ordered off of the auto auctions on e-Bay Motors - all the way from Colorado, I am on the east coast of North Carolina) and am stoked because it is a 1992, YJ, 4.0L fuel injected with a 5-speed transmission. Can't wait to have 2 jeeps fill my driveway! I'll post some updates and pics when it gets here if anyone is interested. Thanks again.

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Old 12-20-2011, 11:43 AM   #11
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Location: Richmond va
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34 DGEC POS to a 32/36 DGEV

I went through the same issue as you did, could not get the darn thing to work no matter how hard I tried. I eventually switched to a 32/36 DGEV. As soon as I checked all my hoses and fuel pressure regulator were all set-up properly and no vacuum hoses were disconnected a single turn of the key....VROOOMMMMMMMMM Plus the 32/36 DGEV will allow you to hook up some of the smog stuff even if your county doesn't require it. I would ditch that 34 in a heartbeat. Biggest piece of junk, and buy it from Redline, those guys were awesome with customer service, the last company (won't name names, but sounds like Weber Carbs Direct) had horrible customer service.

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