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Old 03-18-2011, 11:42 AM   #1
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carb problems

OK so I'm having the dreaded jeep carb problems. What is the best replacement carb to fix the stalling problems?

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Old 03-18-2011, 12:06 PM   #2
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Mastercraft 2100

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Old 03-21-2011, 08:57 AM   #3
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IS this a direct bolt on or do I have to buy an adaptor plate for it?
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Old 03-22-2011, 05:28 PM   #4
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You will need an adapter plate, but i second the motorcraft suggestion. There is a guy on ebay that sells complete Motorcraft 2100 kits tuned for your area. His kits include gaskets and the adapter plate. Keep in mind that changing to another carb can make it tough to pass emissions testing.
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Old 03-22-2011, 10:33 PM   #5
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Look up ehrmannmp on Ebay. Sells a kit for right around $300. Just did this last weekend. It was easy and all pretty much bolt on. He includes everything you need to install including his own design adapter plate and gaskets.

He also includes a lot of info. I would highly recommend it.

Doug
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Old 03-23-2011, 07:01 AM   #6
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Originally Posted by tslroper View Post
You will need an adapter plate, but i second the motorcraft suggestion. There is a guy on ebay that sells complete Motorcraft 2100 kits tuned for your area. His kits include gaskets and the adapter plate. Keep in mind that changing to another carb can make it tough to pass emissions testing.
One suggestion, I bought from this guy, he is in Colorado I believe. No problems with the product only regret is my choice of the method of choke. I chose electric choke because it seemed easier. I live in Michigan and wish I'd have gone with the manual. The 4.2L I6 is a cold blooded beast anyway (at least mine is) and the electric choke wants to open too soon then stalls out. Just my 2 cents.
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Old 03-24-2011, 03:51 PM   #7
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all good info. and since I live in colorado then maybe this will be easyer. Hey so how hard is it to put in a manual choke? and does his kit come with everything to go from electric to manual?
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Old 03-24-2011, 04:43 PM   #8
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When you order you carb you specify which choke method you prefer. You'll have to route it through the firewall and mount it on the dash, not too difficult.
But if you live in Colorado you may consider making an appointment and have him do it.
That way it is all dialed in when you get it back. Even though the install was fairly straight forward, there was a learning curve getting idle set properly.
Just a quick note, everything I have mentioned is minor when compared to the benefits gained from this conversion. You're YJ will go from a brick on wheels to a reliable daily driver.
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Old 03-24-2011, 04:51 PM   #9
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Are you planning on doing the Nutter Bypass too?
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Old 03-24-2011, 05:03 PM   #10
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Just finished last month with the conversion from him. I went with the manual choke method. Eveything was real easy. He also provides a very detailed .pdf with instructions. You will have to do the nutter by-pass if not already done. I ran into a minor problem with it but eventually ran two wires directly instead of using what they had. All in all best thing I ever did. The manual chake adjustment I screwed up on but got it figured out.
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Old 03-25-2011, 08:08 AM   #11
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whats the Nutter Bypass?
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Old 03-25-2011, 10:47 AM   #12
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whats the Nutter Bypass?
Its when you bypass then do a nutter one hahahaha someone told me that once sorry had to say it...... you splice the orange and purple wires coming from your distributor straight to the orange and purple at your ignition control module. Originally the wires run from ignition control module to your emissions control module and it tweaks your distributor to be nicer to the enviroment which can cut power and mpgs. What your doing is connecting your distributor and ignition control module directly so they are not affected by ecm. Essentially making it run better. You will also have to set your timing about 8degrees before, plus some stuff with the vaccum lines that I never did, I would reccomend researching heavily before doing it so you get all aspects of it.
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Old 03-26-2011, 05:35 PM   #13
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I just ordered the Motorcraft Carb from ehrmannmp on Ebay with the electric choke. I had already replaced the points distributor, the PO installed, with a HEI. I'll let you know how the install goes.
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Old 03-28-2011, 09:46 AM   #14
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Thanks man let me know how the install went
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Old 04-08-2011, 03:03 PM   #15
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USMC Ret Thanks for your service!
I have an 88 YJ
I had the same stalling issue and crap like that too it ran awful and used a ton of gas
I installed a Weber 34 DG Carb (Quadratec $289) and performed this Nutter BYpass you are hearing about, and it runs like it came off the lot...Awesome
If you want some help going through it or otherwise hit me up ill be glad to help out
Jeff
88YJ 84CJ 95YJ
SKC, USN (Ret)
Hooyah
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Old 04-09-2011, 01:18 PM   #16
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i ahve the weber and am going to go to the motorcraft once i get the adapter plate. its not a real weber and its ok but you have to make lots of adjustments, not like the motorcraft, which has only an idle screw and a 2 mixture screw.
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Old 04-09-2011, 01:21 PM   #17
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Yup yup yup, when my motorcraft gets here (went lazy ordered from that guy off ebay) I will have a weber 38 dgas for sale. That weber has been a longtime problem for me!
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Old 04-10-2011, 12:33 AM   #18
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your weber is a real weber so it should be trouble free. i have that 34 weber. you want trouble, get this one. or, send me yours, when you get your motorcraft, and i'll send you this one and you can sell it on ebay since it is actually supposed to be for a jeep. i'll rebuild that 38 and make sure its got the proper jets and preserve it for if i ever get another 320i bmw and then use it on that.
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Old 04-10-2011, 09:08 AM   #19
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When I first commented on this thread I had just got my carb installed. It's been a few weeks now. I am so happy with the Motorcraft carb. I have an 89 YJ with the 4.2 and a five speed. It's pretty much stock with old saggy springs and 235/70 tires on it. It has a hard top and full doors and about 170,000 on the odometer. Just wanted you to get an idea of what I am dealing with.

I have played with the carb and you can actually run the thing down to about 200 rpm idle and it's still smooth. Amazing. I have it set to about 700 rpm for idle and about 1500 rpm for fast idle. I tuned it using a vacuum gauge and checked the timing when I was done. It runs like a top. It is so smooth. And here's the kicker... I drive about 60 miles round trip to work each day. 30 miles of that is on the freeway. I am getting right at 20mpg. I'm sure your mileage may vary depending on tire size, how you drive, etc. I drive like grandpa. I do 65 or really close to it on the freeway. Never really get over 70 or so. It will easily do 85. I almost never mash the pedal to the floor when accelerating... just smooth take offs.

This is by far the best thing I have ever done to the Jeep. It's like an entirely different vehicle. I couldn't recommend this enough.

Doug
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Old 04-10-2011, 09:49 AM   #20
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dang, nice!!
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Old 04-18-2011, 09:09 AM   #21
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all great info. one more question, do i turn the mixture screw left or right to lean it out.
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Old 09-09-2011, 05:25 PM   #22
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Originally Posted by weirdodaddy View Post
When I first commented on this thread I had just got my carb installed. It's been a few weeks now. I am so happy with the Motorcraft carb. I have an 89 YJ with the 4.2 and a five speed. It's pretty much stock with old saggy springs and 235/70 tires on it. It has a hard top and full doors and about 170,000 on the odometer. Just wanted you to get an idea of what I am dealing with.

I have played with the carb and you can actually run the thing down to about 200 rpm idle and it's still smooth. Amazing. I have it set to about 700 rpm for idle and about 1500 rpm for fast idle. I tuned it using a vacuum gauge and checked the timing when I was done. It runs like a top. It is so smooth. And here's the kicker... I drive about 60 miles round trip to work each day. 30 miles of that is on the freeway. I am getting right at 20mpg. I'm sure your mileage may vary depending on tire size, how you drive, etc. I drive like grandpa. I do 65 or really close to it on the freeway. Never really get over 70 or so. It will easily do 85. I almost never mash the pedal to the floor when accelerating... just smooth take offs.

This is by far the best thing I have ever done to the Jeep. It's like an entirely different vehicle. I couldn't recommend this enough.

Doug
What size Jets are you running in your 2100?
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Old 09-11-2011, 08:14 PM   #23
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What size Jets are you running in your 2100?
In all honesty, I have no idea. I told the guy on Ebay what I had and how I drove my Jeep and he did the rest.

And again, since I have posted in this thread I have lifted the Jeep 4" and put 33" tires on it. Let me say, it doesn't get 20mpg any more. I do still drive it 60 miles round trip to work daily. The carb still works like it's supposed to. Still the best mod I have done to the Jeep.

Doug

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