Knox's Definitive Cater BBD (No stepper) Vacuum Line Help Thread - JeepForum.com
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Unread 06-27-2013, 02:18 PM   #1
KnoxButler
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Knox's Definitive Cater BBD (No stepper) Vacuum Line Help Thread

I posted another tread on the forum, but was in to much of a rush to do a good job giving details and providing images for you guys to help me out so I'm going to give it a second shot.

Background: Im doing a bit of a restoration to my 81 CJ7, the PO messed around with it a lot and when I bought it, it was running rough at idle and at certain rpms. I fixed the idle by cleaning out the carb. idle tubes and doing a "team rush" on the distributor cap. However upon following a combination of a diagram (http://i58.photobucket.com/albums/g2...ey/82Mod-1.jpg) and another thread (http://www.jeepforum.com/forum/f8/no...cation-614214/)
I tryed rerouting the vacuum lines to no avail.

The problem I ran into is that I have no or cant locate my cto valve, when I called up my local parts store they said that my jeep didn't come with one.

My goal is to get the vacuum lines routed correctly so that I can eliminate that as a variable in my rpm flutter as well as properly hooking up the egr valve.

Misc. Detail, for one reason or another although I have an 81 the Carter carb. that I have has no stepper motor or place for one to be put in. Also no computer to be found. So I believe that it is one from an older jeep put on my newer one.

Here are the pictures: http://www.flickr.com/photos/98174118@N08/

I need to know what A,B,C,D,E,F are supposed to go to.

Any and all help is greatly appreciated!
-Knox

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Unread 06-27-2013, 03:08 PM   #2
83vert
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81 has no computer or stepper motor.
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Unread 06-27-2013, 03:28 PM   #3
KnoxButler
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It didnt? I thought I had seen some ware that the 81 was the first year to have them?
Do you know if they had a cto valve stock?

-Knox
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Unread 06-27-2013, 03:35 PM   #4
83vert
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83 was the first year for computer. I believe it did have a cto
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Unread 06-27-2013, 03:36 PM   #5
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Do a few searches about vac lines and you will get a ton of info
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Unread 06-27-2013, 04:02 PM   #6
KnoxButler
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Thats the thing I have done a ton of searching around and everything I find is different. Where is the cto supposed to be?

-Knox
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Unread 06-27-2013, 04:18 PM   #7
SLO_Ken
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On the intake.



http://www.jeepforum.com/forum/f8/25...l#post15371381
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Unread 06-27-2013, 04:49 PM   #8
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When I get more time I will try to help more specific. Have a little one and I have a hard time posting alot.

But start with this. There is no right way per se to hook up vacuum lines. Many different stock set up you will see. Google adventures under the hood and do everything not controlled by computer. Thats what I did. I have same carb no computer.

All that matters is you have right hose to right source of vacuum. Manifoild vs ported.
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Unread 06-27-2013, 05:38 PM   #9
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Ok I sort of gathered that, i often thought it would be helpful to know which port on my carb is ported vs non, and then to go with that find out what parts need ported vs non.

Are all the ports on the carb simply multiple ported and non ported, or are some specifically for one thing?

-Knox
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Unread 06-27-2013, 05:57 PM   #10
83vert
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I'm going to look for a drawing Matt did for my setup which should be the same for yours gimme a couple mins
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Unread 06-27-2013, 06:05 PM   #11
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I can't seem to do anything with pictures on this site, I'm sorry. Try searching vac hoses are crushing and go to page 2, that's where the pic is
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Unread 06-27-2013, 06:11 PM   #12
86cj74.2L
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Quote:
Originally Posted by KnoxButler
Ok I sort of gathered that, i often thought it would be helpful to know which port on my carb is ported vs non, and then to go with that find out what parts need ported vs non.

Are all the ports on the carb simply multiple ported and non ported, or are some specifically for one thing?

-Knox
I thought John posted the vacuum diagram for your year engine?
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Unread 06-27-2013, 06:26 PM   #13
INowUnderstand
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C- is ported I have it attached to CTO- that runs EGR and ported signal from evap canister
B- is manifold have hooked to air clear dampners
A- is capped on mine- I think it is manifold
D runs is a thermal switch I think and runs from the dampner on air cleaner that controls the exhaust coming in from the tube
E is a thermal switch the comes from CTO then to EGR
F is the dampner that open to let exhaust in during start up. Cant tell but mine has another dampner on air cleaner that block off intake to filter when engine is off-
both air clearner lines T together then tie into port B on mine
My dizzy advance is on manifold off the brake booster line. I think sometimes it is hooked into C.
COuld use A maybe?

Get a Vacuum pump/gauge it will help a lot
ported vacuum= 0 at idle and increases with throttle. ports located above throttle pplate
Manifold Vacuum= should be 18-20 at idle and falls with throttle- located below throttle plate

that all for now.

check out Advneture under the hood- esp for air cleaner operation
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Unread 06-27-2013, 06:30 PM   #14
INowUnderstand
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Also your fuel filter is upside down. Return line shiukd be uovat 12 oclock. It is the nipple on outside toward carb
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Unread 06-27-2013, 06:32 PM   #15
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Looked at my jeep. Looks like you don't have air cleaner dampner that closes off when jeep is off. Is just keeps fumes from coming out air cleaner from carb.
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