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Unread 06-03-2013, 07:36 PM   #1
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1978 CJ7 
Join Date: Sep 2012
Location: Malvern, Pa
Posts: 1
vacuum hoses / air lines

My apologies, as I've read through thousands of posts and I know some of my question is redundant. I bought a 6 cylinder 79 CJ7 a few months back. She sputters when I decelerate, backfires when I shift between gears, has a ton of hesitation at highway speeds, and stinks like exhaust inside the cab.

When I bought the CJ, every hose was either cut, had a golf tee in it, etc. I still drive it everyday, but need to get it fixed.

In reading through my Chilton manual, as well as the posts on this Forum, I can only figure out 1/2 of the set-up I need to be running with my hoses. I have diagrams I can't quite follow (or where not all the parts are labelled), and I'm stuck!

Can someone help by looking at the labelled pics and let me know:

A connects C
B connects with a 't' to F & H
Etc, etc

I am not aware of any modifications, and I assume it's pretty stock. I believe it has lived it's whole life in PA, which, based on reading other threads, may have an impact on the emission set-up.

distributor.jpg   carb1.jpg   carb2.jpg   cto.jpg   photo-2-.jpg  

photo-5-.jpg   air-filter.jpg   air-filter2.jpg   charcoal-filter.jpg   engine-sticker.jpg  

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Unread 06-03-2013, 08:55 PM   #2
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1981 CJ7 
Join Date: Jul 2009
Location: Bali, Indonesia
Posts: 4,391
You should make a list of what you have in the way of components, what you want to keep and what you want to add. What is your aim with this, to meet an emissions test or just to get it running smooth?

Have you got a brake booster?
Have you got an air pump?
What fuel system have you got. Has it got a tank return? How is the tank vented?
You have the EGR valve (just below F in your pic) but does it work? They can help the engine run better but not vital.
Which carb do you have?
Where are your manifold vacuum and ported vacuum ports? I suspect E and F are manifold vacuum but that is where I would have expected the brake booster to be connected. G may be a ported vacuum connection, does it connect above or below the throttle butterflies If above it is your ported vacuum source?
I am not sure what B and C are. Is that part of the vapour control?
The TAC is there, which is worth retaining, but it is missing a few fittings.
You have coolant temperature switch / CTO in the side of the block, but your pic is unclear as to how many ports it has. This comes into its own with the vapour canister, but no sign of that.

I am sure someone will chime in with the diagram of the hose routing for a 1978 with a TAC and vapour canister. Just to get it working you need to at the least connect the distributor A to manifold vacuum F and plug holes G and E.
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Unread 06-04-2013, 08:17 AM   #3
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1977 CJ7 
Join Date: Mar 2011
Location: , Northern Arizona
Posts: 2,898
Some of the on line parts houses have the factory service manuals and other valuable information on line. Chilton's and Haynes are good sources for GENERAL information, but they get weak on specifics.

Here's a link to Morris 4X4's "Jeep Knowledge Base":

Snoop around in there and you might find some useful information. If you don't find your year, usually if you go one or two up or down you may get lucky as Jeeps evolved slowly.
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