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Unread 05-31-2010, 09:23 PM   #1
Ken4444
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Can you identify these vaccum lines?

1985 CJ7, 258 engine, manual trans.

Today I noticed a disconnected vaccum line in the engine compartment. I traced it to a "Y" connector. The "Y" lead to two other disconnected hoses. I was able to pull the whole thing out. Here it is:



I also noticed a group of vaccum connectors toward the rear of the engine, and two of the ports were plugged with screws. The photo below shows the plugged ports circled in red. The red arrow points to the rear of the engine:



Does anyone have any idea what the disconnected hose might be and what the plugged ports are supposed to connect to?

The engine starts and runs fine. I haven't done the Nutter Bypass yet.

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Unread 05-31-2010, 09:56 PM   #2
BioTex
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Maybe this will help. Not sure what year, but worth a look.
258vacuumdiag.gif  
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Unread 05-31-2010, 10:05 PM   #3
Ken4444
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Quote:
Originally Posted by BioTex View Post
Maybe this will help. Not sure what year, but worth a look.
Yeah, I have basically the same diagram in my Chilton's manual. There are at least 6 "Y" connectors Maybe I can figure it out based on the check valves.
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Unread 05-31-2010, 10:39 PM   #4
mcmud
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1983 CJ8 
 
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The top photo is of the TAC system hoses and the lower photo is of the upstream/downstream pulse air switches on the left and the carb. sol-vac switch is on the right (as seen in the photo).

You will find them as well as all others here; Table of Contents
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Unread 06-01-2010, 04:51 AM   #5
keith460
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Quote:
Originally Posted by mcmud View Post
The top photo is of the TAC system hoses and the lower photo is of the upstream/downstream pulse air switches on the left and the carb. sol-vac switch is on the right (as seen in the photo).
^^X2^^

They are in deed for the factory TAC system on the OEM Air Cleaner assembly.



Pulse Air switches too but don't have a good photo of those since they are now gone with the use of a Weber carb changeover.

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Unread 06-01-2010, 06:55 AM   #6
Ken4444
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Quote:
Originally Posted by keith460 View Post
^^X2^^
They are in deed for the factory TAC system on the OEM Air Cleaner assembly.
[/IMG]
Okay, good information. My air cleaner assembly doesn't have that second vaccum actuator on it. It looks like it was removed because I can see the hole where the original rivet was. See red circle below. What does this missing piece do? I think the existing piece lets warm air in from the exhaust manifold, although mine is missing the hot air tube.

I should route that vac line away from the valve cover.

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Unread 06-01-2010, 08:40 PM   #7
Bubba Ray
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I think you are missing the flap that will close off the intake for fume reasons. Mine has been bolted into the open position. No great loss. Check the site "Jeep Adventures under the Hood" to be sure.
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