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Old 01-10-2012, 09:01 PM   #1
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Question Help with 4.2L motor project.

Hey guys I bought my first project Jeep about 8 months ago. Its an 89 YJ with the stock I6. It runs just not well. Getting the motor more dependable is the first thing on the list. I would like to do away with all possible sensors and electronics. I've read the computer can be totally done away with but I'm sure how that works or where to start. I would also like to do away with the entire emission system or as much as possible. I'm pretty sure the PO had a similar idea since many sensors are unhooked and emission lines either missing or plugged off. I want to keep it as basic and simple as possible for the motor. My wife and I are expecting our first child so budget friendly is a must for now for this project . ANY and ALL advice, suggestions, pictures, or ideas will be greatly appreciated. Thanks guys!

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Old 01-10-2012, 10:01 PM   #2
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Hello from someone doing the same thing,just finished all of the running gear,all fluids ,brakes,lines,seals and motor tune up.replaced the carb with a rebuild,it took 3units from parts store to get one that would even run.what a wast of money.ordering a motorcraft 2150 carb to fix problem.still a lot to do to get the motor running right. Looking to the nutter bypass to get back to having a good running offroad jeep! Ha.ha. Just start with the safety things first,brakes,lights,fuel lines,u-joints and good seat belts and go from there.its a slow fix on your on but it's fun and you learn a lot about your new toy.

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Old 01-10-2012, 10:22 PM   #3
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Yea i want to do everything on my own as i get time just for pride reasons ha (and budget). Really interested in finding out how to do away with the sensors right off the bat. I've read about the nutter bypass but not sure what that is or how to go about it yet though.
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Old 01-10-2012, 11:33 PM   #4
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if some of the sensors and emission lines are disconnected or missing already, the PO might have done the nutter

once the computer is out of the loop, you would be amazed at the pile of wire and vacuum lines you can pull out of there

depending on emissions laws where you are, you swap the carb or go to fuel injection
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Old 01-11-2012, 12:00 AM   #5
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Nutter bypass is a good place to start, costs nothing but a little wire and time. Next a MC2100 conversion would be on my list, there is a guy on ebay that sells a complete package. If you are fairly handy, you can get one out of the junk yard and rebuild yourself and end up with less than $120.00 investment. You may also want to consider a team rush upgrade. You can google any of these for information. I have done all of these on my 90 4.2. No more cat, computer or endless vacuum lines.This will give you a place to start.

This is a Picture Guide to Nutter Bypass - JeepForum.com

motorcraft carb swap! - JeepForum.com

http://www.therangerstation.com/tech..._2150_carb.pdf

Trans-Dapt Performance Products 2086 - Trans-Dapt Performance Carburetor Adapters - Overview - SummitRacing.com

Team Rush Mod (Writeup w/ Pics} - JeepForum.com
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Old 01-11-2012, 12:16 AM   #6
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I just replaced my 2.5 l out of my 94 wrangler with a 87 4.2l and I'm doing as little wireing as possiable I started with putting a points and condenser distributor in it paid 40.00 for the parts house and then I put an adapter plate to go from a 2 barrel carb to a 4 barrel carb only because I had the carb laying around but the plate cost me 20.00 or u can probably get a 2 barrel used for a couple hundered bucks
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Old 01-11-2012, 12:33 AM   #7
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Old 01-11-2012, 08:55 PM   #8
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Quote:
Originally Posted by Timberwolf View Post
if some of the sensors and emission lines are disconnected or missing already, the PO might have done the nutter

once the computer is out of the loop, you would be amazed at the pile of wire and vacuum lines you can pull out of there

depending on emissions laws where you are, you swap the carb or go to fuel injection
I'm assuming from your response you have done this. I live in Mississippi so no regulations to speak of. What all vac and emission lines can be removed after the bypass?
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Old 01-11-2012, 09:02 PM   #9
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Quote:
Originally Posted by 90YJinPC View Post
Nutter bypass is a good place to start, costs nothing but a little wire and time. Next a MC2100 conversion would be on my list, there is a guy on ebay that sells a complete package. If you are fairly handy, you can get one out of the junk yard and rebuild yourself and end up with less than $120.00 investment. You may also want to consider a team rush upgrade. You can google any of these for information. I have done all of these on my 90 4.2. No more cat, computer or endless vacuum lines.This will give you a place to start.

This is a Picture Guide to Nutter Bypass - JeepForum.com

motorcraft carb swap! - JeepForum.com

http://www.therangerstation.com/tech..._2150_carb.pdf

Trans-Dapt Performance Products 2086 - Trans-Dapt Performance Carburetor Adapters - Overview - SummitRacing.com

Team Rush Mod (Writeup w/ Pics} - JeepForum.com
Thanks so much for all the info! Can i simply rebuild my carb and still remove most vac lines or do i need to do the MC2100 conversion to do away with the lines? And once the nutter is done I assume anything tied to the computer can be done away with? Thanks again for all the input.
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Old 01-11-2012, 09:17 PM   #10
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If you have the stock carb with the step valve on the back of carb ,no because it will always cause you problems.I went through 3 rebuilds to get one that would even run and not very well.they were350.00,don't waist your money
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Old 01-11-2012, 09:26 PM   #11
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Originally Posted by Oldmuddy View Post
If you have the stock carb with the step valve on the back of carb ,no because it will always cause you problems.I went through 3 rebuilds to get one that would even run and not very well.they were350.00,don't waist your money
Are you doing the nutter once you get ur new carb?

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