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post #1 of 13 Old 09-12-2009, 09:12 PM Thread Starter
TACAMO
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84 cj7 carb

Hi, I would like to rebuild my carb and was wondering how I would determine what carb I have so I can buy the right rebuid kit. Its an 1984 cj7 258 inline 6.

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post #2 of 13 Old 09-12-2009, 10:36 PM
sanddrag
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Is there a plug with a bunch of wires sticking out the back side of it? If so, you have the factory stepper motor controlled Carter BBD, and kit can be purchased here Original Replacement Parts 17705.10 - Carb Rebuid Kit for 76-90 232 or 258 6CYL Carter 2 Barrel - Quadratec This kit also works for the non-stepper motor ones of earlier years. Can you post a pic of your carb?
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post #3 of 13 Old 09-13-2009, 06:05 AM
Mike Romain
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There also should be a tag on one of the top bolts on the carb, but the generic kit works well and is easy to put in. Just don't unadjust anything you don't have to to clean things.

You also will want to pay close attention to the number of turns out the idle mix screws are at so they go back the same. Stock the mix screws are capped over so they can't be messed with, the computer fine tunes the mix, but lots are cut open to 'adjust' the carb because folks 'think' it needs it.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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post #4 of 13 Old 09-13-2009, 12:57 PM Thread Starter
TACAMO
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yes, I belive it dose have a stepper motor. I have a pic but I cant figure out how to put it in the message, its on my desktop.
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post #5 of 13 Old 09-13-2009, 05:38 PM
Mike Romain
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You will need to set up something like a photobucket account and then post a link to it.

Are you in an emissions area? There are tricks to getting more power and still being able to pass the emissions sniffer by disabling the emissions computer to take care of problematic sensors, but if it runs nice now....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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post #6 of 13 Old 09-13-2009, 06:49 PM Thread Starter
TACAMO
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all right thank you here is the pic. No I do not live in a emissions area. and no it does not run good it wont even idle.
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post #7 of 13 Old 09-13-2009, 07:29 PM
marmaduke
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'86 cj7, 360 cui, msd ignition, hedman htc's and still upgrading
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post #8 of 13 Old 09-13-2009, 08:10 PM Thread Starter
TACAMO
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Thanks marmaduke
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post #9 of 13 Old 09-14-2009, 06:19 AM
Mike Romain
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The idle pickup tubes are notorious for their 'too small' crimped ends blocking which causes no idle. The U shaped gas line between the carb and filter can hold an amazing pile of junk in it. You will need two wrenches to remove it or you will mess up the float needle setting. You have to hold the fitting at the engine solid when attaching that gas line.

To see if it is just an idle tube issue, you carefully watch down the carb while keeping it running and give it a slow shot of gas. If you see drops of gas vs a spray of gas, the idle tubes are blocked. They are brass tubes in the center venturi cluster and can be removed from the top. (cleaning while kitting is best) Folks ream out the crimped ends to 0.032". Welding torch tip files or drills come this size as do dremil tool bits.

If you really want to get ambitious, you can remove the computer and it's related sensors from the ignition loop. Here is a thread on doing that: http://www.jeepforum.com/forum/f8/ho...bypass-522262/

Your gas filter is also in crooked. The return line needs to be up top or gas siphons back to the tank when it sits.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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post #10 of 13 Old 09-14-2009, 08:21 AM
DUX4LIFE
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Which brand of kit is best...

O'reilly's has 3 different brands for this carb. Holley, BWD, & Walker, all for the BBD Carter carb. Is there any quality difference between them? Walker is only $15.00 and the others are not priced online.
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post #11 of 13 Old 09-14-2009, 08:28 AM
Mike Romain
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I haven't really found a difference in the $15.00 kit vs the $25.00 kits.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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post #12 of 13 Old 09-14-2009, 03:32 PM Thread Starter
TACAMO
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all right I bought the rebuild kit, Thanks everyone for the info. Now ive been looking at that nutter bypass, so pretty much it bypasses the computer.
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post #13 of 13 Old 09-15-2009, 06:07 AM
Mike Romain
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The nutter directions are kinda long now.

Basically I just add two new wires twisted together (for RF interference control) from the orange and purple wires at the distributor to the orange and purple wires at the distributor. This way I don't have to mess with any of the vehicle harness, it can be left alone.

Then the pins on the carb's stepper motor need to be set at the half way point or with their shoulder about 1/8" from the back wall for the high speed mix.

I then have to reset the timing at 'idle' to 8 deg BTDC and set the carb mix up with the two screws down front.

I also get 100 miles extra using 91 octane vs 87 octane and a bunch more high speed punch so you may want to try some tests of octanes.

Once it is running good, 'then' I think on maybe taking all the extra stuff off, but it can just be left alone.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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