Trying to use BBD with stepper motor on 76 258 -

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post #1 of 4 Old 07-16-2016, 09:37 PM Thread Starter
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2003 WJ 
Join Date: Dec 2011
Location: Knoxville
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Trying to use BBD with stepper motor on 76 258

I'm trying to upgrade from a one barrel to a 2 barrel carb on a 76. The first thing I did was find a 2 barrel intake on eBay. Not knowing any better, I ended up buying one for a mid 80s Jeep or AMC. I found a 2 barrel carb from a similar vintage engine that was in really nice shape and cheap. However, it has a stepper motor. I have been reading about the Nutter bypass, and I guess one of the steps is to get the stepper motor to move the jets to a rich position before you disconnect the computer. However, that's not an option for me. Other than just bolting on the carb and hoping the stepper motor was in a favorable position before it was removed from its original engine, is there a good way to adjust the position of the stepper motor? Or should I not waste time with this carb and try to find one from an earlier year without the stepper motor?

Also, before anyone asks, yes I know I need to get a new exhaust manifold to match the intake. I already have one. I also have the crappy stock Prestolite ignition but I'm going to upgrade that after I get the fuel system in order.

I apologize if this has been covered before but I couldn't find any answers by searching.

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post #2 of 4 Old 07-17-2016, 04:45 AM
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1984 CJ7 
Join Date: Jan 2007
Location: Doylestown, PA
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There's a good article that outlines how to adjust the Stepper Motor needles of the carb here:

Basically step #1 when one does the Nutter Bypass using the Carter BBD w/Stepper Motor.

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post #3 of 4 Old 07-18-2016, 07:18 PM
John Strenk
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1976 CJ5 
Join Date: Feb 2005
Location: Shalersville Ohio
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No reason why you can't spend a little time fooling around with it. Learn something at the same time.

However if it's an used carb that has been sitting around a long time there may be some blocked passages that can cause problems later.
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post #4 of 4 Old 07-19-2016, 01:31 AM
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a $15 rebuild kit and a $5 can of carb cleaner and read the articles, these carbs have a few adjustment procedures that you need to follow.

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