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Old 12-22-2008, 08:39 PM   #1
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Cool 4.2 with weber carb

i have a 90 yj with the 4.2 and a weber carb. it was a rebuilt motor and new carb when i bought the jeep. It doesnt seem to have the power it should. Is there some kind of adjustment needed on the carb, or could the smog stuff be choking it out.

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Old 12-22-2008, 10:26 PM   #2
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well the adjustment on a weber or carter carb is taking it off and junking it. i had a carter carb on my cj7 and it gave me nothing but problems from the day i bought the jeep. webers are not much better. I have a EMPI carb on the cj now and it works much better than the carter ever did. my husband had a weber on his '90 yj and had nothing but problems too. If you have $1200 to spend i'd go with the Howell Fuel Injection conversion kit. i got it for my husband for christmas 2 years ago. he is still in the process of building his yj so he hasn't really tested it yet, but i know it is better than carburetion.

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Old 12-22-2008, 10:28 PM   #3
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just another thought...how clean is the air filter? when i go off-roading in mud and the filter gets clogged i have the same problem with it choking out.
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Old 12-23-2008, 02:27 AM   #4
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Do the tune up first
check plugs, cap,rotor and wires
make sure fuel filter and air filter are clear
no vacuum leaks
Condemn carb last
good luck
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Old 12-23-2008, 04:13 PM   #5
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the guy i bought it from never took it off road, let alone in the mud. so the air filter wasnt plugged from the start and i have blown the dirt out a few times since i have had it. i just replaced the fuel filter. it has a fuel pressure regulator in line right by the carb but no matter where i put it, it doesnt make a diffrence. i will pull the plugs and have a look at them.
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Old 12-31-2009, 11:32 AM   #6
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Hello I have same carb. had same prob. I did nutter bypass helped alot. I have no smog stuff all new elec. stuff I just got fuel pressure reg. but need to get fittings for it. Where do you have youre vacuum advance hooked. I had mine hooked to carb. base where they said but the vacuum advance went to full at idle so i'm in the process of finding ported vacuum witch is needed so no vacuum at idle only when giving it gass. Sounds like maybe your prob also. If you find ported vac. with no smog stuff let me know and I'll do same good luck
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Old 12-31-2009, 12:21 PM   #7
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the carter is junk no two ways about it. i only still have mine because i dont have the money to replace it. but do the nutter conversion and it will help a lot but i still have some problems from time to time.as far as the weber make sure its tuned up right and whens the last time u cleaned out the bowl
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Old 12-31-2009, 12:50 PM   #8
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If you have not done the nutter bypass on a 4.2 you are missing out.
It is like a different motor after it has been done.
I have the link to the best step by step outline of the bypass on my home pc and will send it to you if you would like.
It will only take about a hour of your time if you have even basic mechanical skills and tools.You will need about 12 foot of 12 gauge stranded wire.
The only special tool you need is a timing light to set the timing to 8 degree's when your done.
If you do it and have a question give me a call.


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Old 12-31-2009, 12:54 PM   #9
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When my 89 4.2 had loss of power it was a clogged cat. I replaced it and it ran great with full power.
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Old 12-31-2009, 01:47 PM   #10
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yeah my kitty is going by by this spring its not rattling but its starting to leak
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Old 12-31-2009, 03:12 PM   #11
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I had the nutter mod and the team rush mod with an MSD and still wasn't happy with the Weber 34 I had. The jeep had no power. I went with a Holley 350. I couldn't be happier. I can spin the tires now. I picked up the carb on Ebay for $30. Check the converter, make sure your timing is right, check all the basics, and if you still aren't happy go with the motorcraft or holley carb.
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Old 12-31-2009, 03:18 PM   #12
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i was thinking about either the holly or motor craft carb for my replacement. but i just haven't found one yet. did u have to make any mods for the holly or was it pretty straight forward.
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Old 12-31-2009, 07:02 PM   #13
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I just replaced a weber with a motorcraft carb. Amazing difference, now it actually runs. I'm going to smash the weber with a hammer so it never gets transplanted again ( by mistake ).
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Old 12-31-2009, 08:23 PM   #14
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The biggest pain was making my own linkage. I wanted to retain the cruise control and I have an automatic trans. If you use a Mr. Gasket adapter you have to silicone it or you will have a vacuum leak. I prefer the holley over the motorcraft only because it is simpler and a little easier to tune if you need to. I also have tons of extra carb parts from building a few cars. The guy selling the motorcrafts on Ebay sets them up for the jeep. I am with you former USMC I wanted to destroy the Weber. I ended up selling it off.
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Old 12-31-2009, 09:11 PM   #15
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Motorcraft

I just pulled an EMPI that ran rich no matter what I di. Grabbed a motorcraft off ebay for about $40 including shipping. It is like a new Jeep. No more hesitation. I would highly recommend it, unless you can swing the bucks for the howell.

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