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Old 07-06-2012, 02:19 PM
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Carb rebuild

can anyone tell me how to rebuild the carb on a 4.2 I think this is most of my problems i am having
my jeep is a 1988 YJ with the 4.2 it will mis and cut out on take off as well as sometimes while driving also feels like it is lacking power fuel pump and filter are good I am guessing that i need to look at the carb??? I have also heard that there is something that can be bypassed that will make a big differnce on the way the motor will run if someone may know something about this any info will help
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Old 07-06-2012, 08:37 PM   #2
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Look up nutter bypass, basically it tells the computer something else, and sets the carb up to a single adustment that never moves.

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Old 07-06-2012, 08:38 PM   #3
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I have rebuilt a couple of the carter bbd carbs now and you can buy a rebuild kit from your local parts store for 20 bucks or less. then get then pick up the kit from gunk that comes in a paint can. the carb when fully disassembled fits into the can with a little wiggle room. they are quite a simple carb. basically follow the instructions and its a sinch. the measuring tools come in the box as well as a few extra parts you can hang onto. Now with that said do some searches online about the motorcraft 2100 or 2150 carb swap. this is what i did with good results and for cheap. I think i spent 60 buck all together with a trip to the scrapyard and the parts store for a rebuild kit. now that doesnt mean you dont want to bebuild your carb now and see if it is an improvement over what you are experiencing now. This way if it still sucks you can go with the motorcraft swap and you have some rebuilding experience. Also look for the "nutter bypass" as well. no matter which carb you have this is a vast improvement over stock. It is basically to remove all the emmission components, vacuum line mess, and bracketry under the hood. depending on your emmission laws.
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Old 07-06-2012, 08:40 PM   #4
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the nutter bypass eliminates the emmission computer all together. but the 2100/2150 swap makes it even better. some guys also swap out thier distributors for other types. I am planning a 318 swap into mine right now so if you are interested I will have a 2150 up for grabs that works great.
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