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combsn87 05-16-2013 12:37 PM

About to do the Nutter Bypass
Can some one take a quick look at my carb and help me determine if it has the Carter BBD carburetor?


luebkeb13 05-16-2013 12:48 PM

Yes, this is the Carter 2bbl's a junker too

combsn87 05-16-2013 12:52 PM

Awesome! haha thanks man. yes it will be getting replaced soon.


Originally Posted by luebkeb13 (Post 3762138)
Yes, this is the Carter 2bbl's a junker too

BCDonny 05-16-2013 01:26 PM

I use the motor craft 2150 from the eBay guy. Works great

combsn87 05-16-2013 01:32 PM

one other question. on 4x4wire is says this..

The following steps all apply to anyone keeping the BBD carburetor. Steps one and two may be skipped by those changing to another type of carburetor or to fuel injection.
  1. Warm up the Jeep long enough for it to be operating in closed loop mode if the ECM is still functional.
  2. Screw in the idle jets so that the needles that are controlled by the stepper motor move. The purpose of this is to fool the ECM into putting the stepper motor driven needles into the full rich position. When this happens, you will see that the needles will be all pushed the way to the inside of the carb and the tone of the air going through the carb will get much lower and the engine will slow down and start to miss. At this point you should shut off the engine and disconnect the plug for the stepper motors on the back of the carb. The plug stays disconnected from now

are the idle jets these?

and is this the plug for the stepper motor?

Just want to make sure before hand.

thanks again

luebkeb13 05-16-2013 01:59 PM

That is the stepper motor plug. Those bottom screws are to adjust your fuel/air mixture.

luebkeb13 05-16-2013 02:03 PM

Hope this pic helps you out.

combsn87 05-16-2013 02:06 PM


Originally Posted by luebkeb13 (Post 3762366)
Hope this pic helps you out.

Thanks alot!

combsn87 05-16-2013 06:52 PM

so i started this you know, dug in cut wires and what not..and found out that my carb was already bypassed. but not the same way. If you look at picture 4 there is a plate covering where the stepper motor used to be. so i am guessing i dont have to worry about the ecm controlling the carb?

Keymo 05-17-2013 01:16 AM

No. You don't have to worry about it. Though in your case the bypass is "needed" You computer is trying to get information from stuff and control things that aren't even there...

When I got my YJ it has a carb off of a '72 Dodge (Still the Carter) which I didn't figure out until I was doing the bypass as well. Make sure everything else is hooked up and connected the way it should be according to the bypass instructions. It ended up making a world of difference for my YJ.

indirocz28 05-17-2013 07:12 AM

Also, do not adjust your air fuel fixtures without a wideband o2 sensor so you don't cause more issues by running lean/rich. I know its a crazy thing to have on a jeep, but you can make it so that it is modular and use it for several different vehicles.

combsn87 05-17-2013 10:04 AM

awesome, I have to head up to D.C. Tomorrow for a week to work from the office. and then ill have to tackle this in 2 weeks when i get back.

Keymo 05-17-2013 10:09 AM

Good luck, man! It's super easy once you get everything figured out conceptually. Here's my thread that I started when I started the project out... Sadly, I didn't really get any help with it - but I documented what I did and anything I ran into pretty well so that others with similar carb situations could have some help. Don't know why I JUST thought of it. :facepalm:

indirocz28 05-17-2013 11:07 AM

Well Keymo, I will follow your guide and do it on my 4.2L this weekend. ;)

Nubby55 05-17-2013 07:00 PM

I did the By-pass and all was so much better, and then I change the Carb. to one for a late 70s early 80s CJ7 with no stepper motor, bolted right on every thing hooked right up NO MODS no Adapter plates, and runs like New!

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