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Old 02-28-2014, 08:48 AM   #1
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Carburetor change out

I am getting ready to change the carburetor out in my 4.2 liter inline 6 1990 model Wrangler YJ. Could I get some input on what carburetor is recommended that does the best on this motor with as little fabrication as possible.

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Old 02-28-2014, 08:55 AM   #2
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Alot of people would recomened a motorcraft 2150 but i have a weber and it works good. Or you could go with a holley or edelbrock.

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Old 02-28-2014, 09:06 AM   #3
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Did you have to go to a hei distributer also?
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Old 02-28-2014, 09:40 AM   #4
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Right now i have the stock dist. And it works fine. You could leave it stock, or do the nutter, or upgrade to hei. I plan on upgrading when i get some money to spare.
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Old 02-28-2014, 10:06 AM   #5
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Thanks for the info.
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Old 02-28-2014, 12:39 PM   #6
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holley or motorcraft
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Old 02-28-2014, 12:58 PM   #7
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Quote:
Originally Posted by harleydragon View Post
holley or motorcraft
I agree with harleydragon,

I have had all the different carbs on mine, started with the Weber, then went to a MC2150, then to an Edelbrock, and now finally settled on a Holley.

If you are switching to a different carb, then you should either do a Nutter Bypass, or swap over to an HEI distributor or something similar. When you take away the PCM's ability to control your carb, then its going to try and control the distributor, cause that's all it has left to control, without the Nutter being performed.
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Old 02-28-2014, 02:05 PM   #8
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Which holly did you finally settle on?
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Old 02-28-2014, 02:05 PM   #9
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Sorry holley. Lol
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Old 03-01-2014, 01:02 PM   #10
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Mine is just a temp fix till I can finish my stroker build [money is funny] but I love my older model Carter BBD that was used before the computer, 1979 CJ7, it bolts right on is jetted right an runs great. I know it's a "CARTER", BUT IT'S NOT THE NEW ONE! I love it every thing work fine, Cold starts are great and it runs so sweet.
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Old 03-01-2014, 02:06 PM   #11
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The Holley that I have is a 390CFM 4BBL. But that is a little too much carb for a stock 4.2L. Besides you need to run a fuel pressure regulator as well as some internals changed to get it to perform well.

The best carb for a plug and play type of thing would be a MC2150. If you get one from the guy on Ebay, he sets it up for your area (it needs adjusted for elevation and performance) as well as giving you all the adapters needed to bolt it on.
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Old 03-01-2014, 02:31 PM   #12
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Do you know which guy on eBay so I'm sure I get the right man?
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Old 03-01-2014, 02:42 PM   #13
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Motorcraft 2100/2150 JEEP/AMC/Eagle/Pacer Carb Upgrade 258/4.2 1.08 venturisMotorcraft 2100/2150 JEEP/AMC/Eagle/Pacer Carb Upgrade 258/4.2 1.08 venturis
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'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...
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Old 03-01-2014, 03:13 PM   #14
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Found it, thank you for all your help I greatly appreciate it
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Old 03-02-2014, 09:35 AM   #15
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I bought mine from that guy and it started right up. Then it started leaking fuel from the excelerator pump diaphragm. tried calling and emailing but never heard from him again. I was happy with the carb but not the service.
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Old 03-02-2014, 10:23 AM   #16
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So the problem with your pump diaphragm was that because of the carburetor or just a bad pump?
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Old 03-02-2014, 10:27 AM   #17
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Nevermind that was a dumb question. So I am taking it that you had to replace the diaphragms in the carburetor? If that being the case did the carburetor work good after that?
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Old 03-03-2014, 09:57 AM   #18
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Hey rswoody, the guy is now selling new 2150's that he builds and sets up for you, just have to give him your specs. He was doing rebuilds before. Just got mine and installing a.s.a.p. I have a few other YJ friends who converted to these and they run great. Also do the Nutter bypass.
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Old 03-03-2014, 10:17 AM   #19
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Thanks 90yjjeepin, I have read a few bad comments about him not communicating and leaving out instructions, did u have that problem?

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