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Old 05-11-2009, 09:36 PM   #1
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Thumbs down need help with 89 4.2 motor stalling

Hello out there I'm new to the forum however I still have an important question to ask
I have a 89 4.2 carberated motor I am having an issue with the motor stalling when u give it gas aggresivly it will take it easy but not fast. So when u feather the gas she is good but if u drop the hammer it will stall I think this is a vacuum issue however not sure just bought ,y jeep so I'm pretty new to this truck and have tried all the troubleshooting solutions in the haynes repair manual thanks for the help.

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Old 05-12-2009, 12:21 AM   #2
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Welcome to the forum you will find plenty of better help than mine here. but before they answer any questions you will need to have at least this.

What kind of maintenance have you done? IE tuneup, carb reubuilt.
is it a OEM carter carb, after market webber or MC2100?
changed fuel filter?
inspect your vacuum lines? ALL Of them cuz it is like spaghetti in there.

I wish you luck. I have found as much work as the YJ needs it is actually kind of fun and pretty simple.
Cheers,
Bern

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Old 05-12-2009, 06:09 AM   #3
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I have an 89 with a 4.2, original rebuilt carb. How many miles on it? Most problems come back to the carb. or vacuum lines. If you have high mileage on an original carb. It's probably time for a rebuilt or change to an aftermarket. You should consider a fuel pump also. It's easy to change on these. You're probably also due for a tune-up. If your lines are o'k, it's most likely the carb. I know where you can get an original rebuilt from a guy in NJ who specializes in carbs and is extremely knowledgeable on YJ's
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Old 05-12-2009, 07:47 PM   #4
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i am changing all vacuum lines and installing new carb its a empi 370 cfm 2 barrel gonna change sparks plugs it has new disributor and new fuel filter its not an original carb thats on it the carb that is on it was the guy i bought it froms buddys on his cj its reman date is 07 so i kinda think its bad i mean y change a good 1 out thanks for the help i will be off work turning wrenches tommorow so i will check from time to time for any information
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Old 05-13-2009, 11:48 AM   #5
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its the fuel filter. my brothers cj had the same problem.get a filter with asingle outlet.the oem filter has a dual outlet that sends fuel back to the tank, starving the carb. this info is good if your wrangler has the same filter setup as the cj,up near the carb.
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Old 05-13-2009, 10:04 PM   #6
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Before anyone pays big bucks for a carb, please do yourself a favor & look into the MC2100 swap. I put mine on a year & 1/2 ago & it just needed a second rebuild yesterday.
$16.00 for the rebuild kit, & $4.00 for a new fuel filter. it was taken down yesterday in 15 minutes & rebuilt by me today in less than an hour.( This involves cleaning it & putting new gaskets & a few small parts back in) This was my second carb rebuild ever. the first one was the same carb, just before the swap. I got it from a junkyard for $25.00

It works great, especially with the Nutter bypass, & the TeamRush ignition upgrade.

Google it, if you don't believe me. Just be sure to get the 1:08 venturi size (located on the drivers side of the fuel bowl, in a 3/8" circle.)

Manifold adapter is Mr. Gasket# 1937.

$16.00 for a spare kit to take on wheeling trips, & you can completely rebuild it on the side of the trail with a full can of carb spray, a small scraper, a toothbrush, & some basic tools inside of two hours if you take a lot of smoke breaks.

It really is a simple carb!
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Old 05-14-2009, 07:29 PM   #7
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Hey where could i get 1 of these mc2100 carbs?
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Old 05-14-2009, 10:35 PM   #8
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Quote:
Originally Posted by ncfirefighter217 View Post
Hey where could i get 1 of these mc2100 carbs?
At your local junkyard. Be sure to get the 1:08 Venturi & Record the donor vehicle info. The bowl tag should be present as well.

Mine came off a 1974 Ford F-250 302 CID. Plenty of old fords had 'em, & Autolite versions were also available. If you go to jeepsunlimited.com & join, you can do a board search there for MC2100. Be sure to find the MC2100 database thread. There are several other threads too.

If you need me to answer a question quickly, look me up at http://www.forums.coastalcarolinaoffroad.com/

PM me there, or post your question in jeep tech. Some members there,are from your area too!

This deal is way better than that Carter BBD! Besides you can have fun coming up with clever ways of ridding yourself of the BBD. Chunk it onto your neighbors roof, or grand slam it with an old baseball bat. Chain it to your back bumper & keel haul it around the neighborhood!

I smashed mine with a sledge hammer.

Or you could sell it on E-bay to some yoyo for a good laugh.

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