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Old 04-04-2012, 04:30 PM   #1
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Unhappy Weber 34 dgec or mc 2150/ 2100???

I have a 1990 Jeep Wrangler 4.2 I-6 with a Weber 34 DEGC and my secondaries aren't getting enough gas they bog out when I try to take off after a red light or going up a hill. Its such a pain and I look crazy trying to get up a hill.

Does anyone have this problem?
Any info will help!!

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Old 04-04-2012, 05:13 PM   #2
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MC 2100/2150 for the win! I had a Weber 32/36 and it sucked!

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Old 04-04-2012, 05:29 PM   #3
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MC 2100/2150 for the win! I had a Weber 32/36 and it sucked!


Isn't that kinda what it's supposed to do?
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Old 04-04-2012, 07:21 PM   #4
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may be your jets are too small, or the acc pump is not working.
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Old 04-04-2012, 09:53 PM   #5
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no, its just a crap carb. its not really made by weber, just by a company that weber let make it and use their name. its a piece of junk. i had one and would rather use the carter then that 34 again. when i had to put it back on because of repairs to my normal holley, it felt like i was driving with a one barrel carb and a 4 cylinder engine.
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Old 04-05-2012, 11:02 AM   #6
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Does anyone have opinion on the mc carbs???
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Old 04-05-2012, 12:09 PM   #7
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Isn't that kinda what it's supposed to do?
Wait a second, I see what your doing here!!


The MC2100/2150 jetted to 1.08 are the best carbs for your money. They can even be set up for off road use.
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Old 04-05-2012, 12:19 PM   #8
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Yep. Get one (1.08 venturi, stamped on side of bowl) from a late 70's 302 truck if you can, they will have the spring-dampened float that works best offroad. Mine runs 47 jets (stock).
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Old 04-05-2012, 12:26 PM   #9
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What about this guy on eBay that say he will put the right jets in and whatever you need - adapters w/e

Is he pretty good
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Old 04-05-2012, 12:35 PM   #10
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Thw guy from colorado is great. He is a member on another jeep forum i am on and he is always helpful when it comes to mc carbs

On jeepz, his name is gronk.

I have a mc2100 from a 65 mustang with the 1.14 venturis and 47 jets. It works pretty good
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Old 04-05-2012, 12:39 PM   #11
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Lots of people have had good luck w/ him....others had problems. Overall, he seems to take care of his customers.

OR......you can do it yourself for under 100 bucks w/ basic hand tools & decent mechanical skills. The adapter is widely available for 15 bucks, ditto w/ a 9" air cleaner. You can get those carbs off Ebay for under 50.....or your local junkyard for less, probably. Plus a rebuild kit and some good carb cleaner & you're set. The 'hardest' part is making a little strip of metal to extend the carb throttle arm so it works /w the downpull Jeep cable you already have. There are a couple of decent write ups on the process out there that a quick google should turn up.
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Old 04-05-2012, 09:00 PM   #12
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yup. i did this /\

cost me nothing since i had the adapter already and you can use the weber parts for the accelerator adapter. gained 3mpg using the mc over the weber and holley

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