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Author Topic: 1991 yj vacuum problems?  (Read 2168 times)

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Offline grumpygy

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Re: 1991 yj vacuum problems?
« Reply #15 on: July 24, 2013, 02:40:03 PM »
What year did they do away with the PCV valve and got to the system like my 94.  Know that the valve cover really needed cleaned out on mine.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline Jeffy

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Re: 1991 yj vacuum problems?
« Reply #16 on: July 24, 2013, 04:25:32 PM »
1991 when they went to MPFI and the CCV instead of the EGR.
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Offline SamsonJR

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Re: 1991 yj vacuum problems?
« Reply #17 on: July 24, 2013, 04:26:06 PM »
I'm not to sure. I know I have a crank case vent (a brass fitting on the front of the valve cover, drivers side) and a breather (back of the valve cover, top) I replaced the breather on the top with a new one. that's the one that has the hose to the air filter, and as for the CCV, I cleaned that out not to long ago too. It was pretty dirty.
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