PCV valve not connected - JeepForum.com
 
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post #1 of 10 Old 04-01-2013, 09:54 PM Thread Starter
CherokeeChuck
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1994 YJ Wrangler 
 
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PCV valve not connected

Hey guys my rear pcv valve on my valve cover isn't connected to anything(bought it that way). From my searching on here it looks like it is supposed to connect to one of the intake manifold vac lines. Unfortunately, the line that is maybe should go there is hooked up to some other line that runs OVER the valve cover and disappears under the jeep. My question is has anyone else ever seen this setup? My guess is the previous owner did this but not sure. I have some oil showing up in the air filter from the other pcv valve (the one on the front) so I'm wondering if this may be the cause. Here are some pictures:







Sorry if the pictures are huge...first time trying to post a pic. Thanks in advance for the help!


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post #2 of 10 Old 04-01-2013, 10:01 PM
VirginJeeper
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Hey bud I can't see what engine you have or year from the app but just judging by the pics I would say that the PO saw oil in the filter and decided that it was best to disconnect that line. Is the factory intake on?
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post #3 of 10 Old 04-01-2013, 10:09 PM
jokerchief462
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One end connects to the air box and brings in fresh air to ventilate the crankcase oil vapors what used to come out of cars thirty years ago as blue smoke. The other end goes to the intake and sends the vapors into the carb or throttle body to burned. Here is a 2.5 and 4.0.
Attached Thumbnails
Vacuum 2.5L.jpg   Vacuum 4.0 #1.jpg  

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post #4 of 10 Old 04-01-2013, 10:28 PM Thread Starter
CherokeeChuck
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Quote:
Originally Posted by VirginJeeper View Post
Hey bud I can't see what engine you have or year from the app but just judging by the pics I would say that the PO saw oil in the filter and decided that it was best to disconnect that line. Is the factory intake on?
It is a 94 with the 4.0. And it had the factory air box on it when I bought it but it was trashed so I replaced it with a cold air kit...maybe not the best choice...time will tell.

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post #5 of 10 Old 04-01-2013, 10:33 PM Thread Starter
CherokeeChuck
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Quote:
Originally Posted by jokerchief462 View Post
One end connects to the air box and brings in fresh air to ventilate the crankcase oil vapors what used to come out of cars thirty years ago as blue smoke. The other end goes to the intake and sends the vapors into the carb or throttle body to burned. Here is a 2.5 and 4.0.
So looking at the diagram for the 4.0, it definitely needs to go to the intake. Problem is, that line it should hook up to is already in use...in fact all the lines are used. That third line down (according to the diagram) is the right one but for some reason it is hooked to another line and runs somewhere under the jeep I tried to track it but I loose it. Should I just say screw it and reattach it to the rear pvc valve?

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post #6 of 10 Old 04-02-2013, 08:21 AM
jokerchief462
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Put in a TEE they sell them and maybe that would work.

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

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post #7 of 10 Old 04-02-2013, 11:49 PM Thread Starter
CherokeeChuck
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Quote:
Originally Posted by jokerchief462 View Post
Put in a TEE they sell them and maybe that would work.
Maybe this is obvious but what do you mean by a TEE?

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post #8 of 10 Old 04-03-2013, 06:21 AM
bmedeiros678
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Quote:
Originally Posted by CherokeeChuck

Maybe this is obvious but what do you mean by a TEE?
Joker may mean a t-connector. Question is what if the line is just pushed down and not connected to anything? It can't be more that a couple feet long.

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post #9 of 10 Old 04-03-2013, 09:46 AM
HaskiE
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yeah wow I'm curious where he hooked that vac line up to... maybe the 4wd front axle disconnect wasnt working so he did that (I think that's run by the vac)?

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post #10 of 10 Old 04-04-2013, 05:17 PM Thread Starter
CherokeeChuck
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Quote:
Originally Posted by HaskiE View Post
yeah wow I'm curious where he hooked that vac line up to... maybe the 4wd front axle disconnect wasnt working so he did that (I think that's run by the vac)?

I think you may be right. Just checked where the mystery line goes. It is definitely connected at the other end to something. It joins with the vac lines that connect the front axle disco and the tcase. But the lines are wrapped so I can't see specifically where it connects to. Here in a little bit I'll see if I can separate the mystery line out from the rest. The suspense is killing me

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