1989 YJ 2.5L Valve Cover swap - JeepForum.com
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post #1 of 5 Old 07-15-2020, 05:58 PM Thread Starter
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1989 YJ 2.5L Valve Cover swap

So I need some help. I recently put an aluminum valve cover finally replacing the leaking plastic one. The installation went great but I have developed a vacuum leak. I am wondering if it has to do with how I have the PCV hose's set up. It is different than the old valve cover.

I hooked the front hose to the front of the intake manifold and the back hose to back of the intake manifold.

Can anyone help?

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post #2 of 5 Old 07-16-2020, 06:26 AM
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1989 YJ Wrangler 
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Location: Morrisville
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Iirc one goes from the air cleaner to the rocker cover, the valve goes in the cover to manifold. Something like that. Both to manifold sounds incorrect and I don’t think that will function right.

[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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post #3 of 5 Old 07-16-2020, 04:42 PM
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1989 YJ Wrangler 
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Rear hose goes to the air cleaner.

See this post for pictures https://www.jeepforum.com/forum/f12/...cover-4386637/

Mine looks like post #12 in that link. I removed the orifice fitting that came with the aluminum valve cover and put the original PCV valve inline.
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post #4 of 5 Old 07-17-2020, 05:40 AM
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1995 YJ Wrangler 
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Rear to air cleaner.

Front to driver side manifold port.
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~YJOTM MAY '16, JULY '19~

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post #5 of 5 Old 07-17-2020, 08:12 PM
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1988 YJ Wrangler 
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I recently did the same and caused massive vacuum leaks. None of them from anything I touched intentionally though. Just disturbing the 32 year old hoses removing the rear passengers side bolt and bracketry caused 3 or 4 hoses back there (where the rubber transitions to metal) to come apart.
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