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Old 06-07-2012, 07:22 PM   #1
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PCV and Air cleaner hose connections help.

Ok, my question is where does the rear PCV valve's Hose connect to?

this is the 4.2L Engine.

This is the pulse Emission system

My Front one that's located just behind the oil cap Runs under the Air box and connects to whats listed as "Valve bowl assembly". From there one side runs to a canister like object under neath the washer fluid reservoir on the drivers side and also runs to the Downstream on the passenger side. (Which I don't have below the elbow valve. Missing the Valve checker and the arm that connects to the converter. Maybe the source of the extremely loud exhaust?)

Now the Back one that's behind the airbox has a short hose that's just long enough to attach to a hole on the back of the airbox, but there's no connector, just a hole. I'm wondering if there's supposed to be a connector in the hole and it may have broken off. On Idle there's pressure and fumes coming out of the hose and while driving I can here it hissing.

So in short, where does this hose go? Thanks, been trolling for a few days and fixed a lot of problems. I'm pulling my YJ out of the woods after a 5 year slumber. She fired right up after minimum necessary change outs.


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Old 06-07-2012, 07:43 PM   #2
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That hose connects to a breather element that's missing on your air cleaner. You can get one in any parts store or you can order one on-line. It's just a small plastic piece that has a foam type element in it that is held onto the air cleaner with a clip. The hose vents into the air cleaner through the element as part of the emissions system.

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Old 06-07-2012, 08:22 PM   #3
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Thanks a lot for the information. Mine seems to be blowing out, but I seem to have read that it is supposed to suck in, but they also said the foam filter is there to prevent oil from entering the breather from the hose blowing in. Can you tell me which the hose is supposed to do?
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Old 06-08-2012, 07:11 AM   #4
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Originally Posted by Ravenlegend View Post
Thanks a lot for the information. Mine seems to be blowing out, but I seem to have read that it is supposed to suck in, but they also said the foam filter is there to prevent oil from entering the breather from the hose blowing in. Can you tell me which the hose is supposed to do?
It vents vapors "out" from the crankcase through the element into the air cleaner. You will get oil residue from the vapors which is normal. The "element" is there to catch the excess oil before the vapors are mixed with air and burned. Purely emissions. In the day, valve covers had open elements built into the oil caps that vented into the environment. From 1968 on, 49 states, that changed to internal venting. California was a bit earlier. They were basically first with more strict emmissions regs.
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