BBD Feedback Carb Opinions - JeepForum.com
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post #1 of 13 Old 07-03-2020, 07:21 PM Thread Starter
SWCJ7
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BBD Feedback Carb Opinions

I recently bought an 83 Scrambler that needs quite a bit of work. I am going to replace the carb and plan on sticking with the original BBD. The PO put a non-feedback BBD on it. Do the feedback carbs perform well when dialed in? I want to restore the Scrambler as original as I can. Thanks in advance.

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post #2 of 13 Old 07-03-2020, 08:44 PM
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Both will work exactly the same if not hooked up to the MCU computer. Just pull the pins on the stepper motor out to full rich.

If you want an exact restore and for that feedback carb to work as intended you will need to repair and replace and maintain the emissions system. This will then partially control the ignition timing and mixture. If you do not repair or replace all 8 sensors the computer will not function properly and then there are lots of other parts which are not even controlled by the computer. Problem is that a lot of the parts are hard to obtain.

I suggest you find a copy of the 1984 FSM (oljeep.com has them for free) and the emissions section and have a good look at what you still have. Hoses can be reinstated from bulk hose but the fittings and devices are harder to get. if you cannot reinstate the entire system, a new feedback carb will be a paper weight.
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post #3 of 13 Old 07-03-2020, 10:36 PM
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Is the computer on the fender? 83 might of used a different computer that only controlled the mixture, not the timing.
I couldn't find much info on them.

You would still need most of the sensors replaced though.


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post #4 of 13 Old 07-04-2020, 05:29 AM
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What you want is what I did on my '84 model CJ-7. Ditched the Carter BBD w/Stepper motor and bought an NOS (New Old Stock) Carter BBD from eBay for a 1980 model year. Off the self carburetor that was 100% bolt on and needed no adjustments. Fired right up and does every time I get in it and go.
But you would still need to do a Nutter Bypass to disable all the other emission control devices associated with the MCU (computer).


1980 Carter BBD shown:
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post #5 of 13 Old 07-04-2020, 05:39 AM Thread Starter
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Thanks guys. It looks like I am going to go with a BBD without the stepper. Keith460 can you give me the tag number of your carb. Will it work if I bolt it on with all the emission stuff still on the Jeep?
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post #6 of 13 Old 07-04-2020, 06:08 AM
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Tag number doesn't matter. Just look for a Jeep model 2brl Carter BBD without Stepper motor.
It will work but MCU will try and adjust timing and other solenoid valves if you don't bypass the MCU and disable it.
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post #7 of 13 Old 07-04-2020, 09:29 PM
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If you decide to Nutter and use the non-feedback BBD then you not only need to disconnect the computer but look at the distributor. The computer did part of the ignition timing so the mechanical advance head is quite puny, only 5.25 or 5.75r.

You can get a new advance head and swap it in or get a 1980 model distributor or even just take out the old and file it down. 13r or 18r will wake it up.

you can check what you have, there is a small window in the base plate under the rotor arm through which, with a good light, you can glimpse the markings on the advance head as they pass under the window (you need to rotate the engine slowly).
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post #8 of 13 Old 07-04-2020, 11:15 PM Thread Starter
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Thanks for the info guys. Here is what I am working with:
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post #9 of 13 Old 07-04-2020, 11:55 PM
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It looks like it's all original in there. I don't really see anything missing other than the Thermal Air Cleaner assembly. Do you have that? Do you have the computer above the glove box? If the PO put in a non feedback carb, it could be because the computer may have died. I've had a couple go out on me. Their location is moisture prone. Also, a bad stepper on the carb can take out the computer with it.

This site will be of help: https://www.gleebledorf.com/

I have an 84 with all of the original equipment functioning still, but it's definitely been some work to keep it that way. I probably wouldn't recommend it unless you had to for smog. It's a fairly complicated finicky system, and some of the parts are no longer available.
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post #10 of 13 Old 07-05-2020, 12:19 AM
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A lot of original stuff under there!!!!

That carb looks like its both original and has never been cleaned!!!! The tag on the top could tell you more, what is the number?

A carb rebuild kit is $15 and a can of cleaner (maybe 2 on yours) would get it working better and you could set up the choke. Takes a few hours of work but not difficult.

The ignition parts look quite old, you could investigate the Teamrush upgrade as it is just the type of service parts being changed to Ford I300 Duraspark II type.

With those and a distributor review you coud get that engine purring.

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post #11 of 13 Old 07-05-2020, 05:06 AM
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Quote:
Originally Posted by SWCJ7 View Post
Thanks for the info guys. Here is what I am working with:

That is quite original and congrats on that. Most CJ's usually have been hacked to death by PO with wiring being one of the worst offensives. Hope you still retain the original Air Cleaner assembly as it is by far superior to anything aftermarket.


Your engine reminds me of mine when I first started taking it apart for the entire restoration of the CJ.
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post #12 of 13 Old 07-05-2020, 05:15 AM
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Quote:
Originally Posted by BagusJeep View Post
If you decide to Nutter and use the non-feedback BBD then you not only need to disconnect the computer but look at the distributor. The computer did part of the ignition timing so the mechanical advance head is quite puny, only 5.25 or 5.75r.

You can get a new advance head and swap it in or get a 1980 model distributor or even just take out the old and file it down. 13r or 18r will wake it up.

That is also what I did for the distributor, installed pre-computer era unit for a CJ that I got from NAPA with the correct advance heads of 13R and 18R. I believe I ordered it under a 1980 model year. Works great, along with the TeamRush improvement of installing the larger spark plug cap that is made for the Ford inline six of 1980. Its Motorcraft distributor so the Ford parts fit without modifications.
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post #13 of 13 Old 07-05-2020, 08:43 AM Thread Starter
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Unfortunately, it didn't come with any air cleaner parts. The tag on the carb is 8103S. I looked that up and that carb was used from 76-79. I did get it started and it sounded good as long as I kept the rpms up. It won't idle very long before it stalls. My next step should be to take the carb off and either purchase another one or maybe have the old one rebuilt.



Keith, that is one nice Jeep you have there. That engine compartment doesn't get any more tidy.




Btw, I apologize for this huge picture. I am trying to figure out how to post smaller images in the future.
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Last edited by SWCJ7; 07-05-2020 at 10:59 AM.
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