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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-08-2006, 02:10 AM   #11
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Originally Posted by wf2tm51
i took it to the shop its there right now the guy gave me an estimate of 450 bucks, i really wish i had the time to do this job but with school and work forget about it and now since its football season i don'nt feel like wasting a saturday or sunday working on my car i want to relax. any way the guy at the pontiac dealership said it was the plenium gasket, i asked about the LIM gasket and he gave me a weird look he said lim was probably a quick name for it, anyway thanks for your guys input
Wow, Archon, were you right on with your quote or what? !!

wf2tm51, on cars, the plenum usually refers to the piece with a throttle body(*) on one end, and an intake manifold on the other. The plenum on an L36 would be the plastic upper intake manifold. It is uncommon for the upper intake manifold (plenum) gasket to fail on the pcv end of this engine, and if it did, it would not leak coolant. The only coolant passages on the plenum are on the throttle body end. Those passages commonly fail. I am guessing that your dealer is referring to the lower intake manifold as a plenum.

If you described "lim" gaskets, or "L" -"I" -"M" gaskets to your Pontiac dealer, he might not have recognized the jargon that we use when writing, but if you said: "lower intake manifold gaskets" and he didn't know what you meant, you need to find another dealer.

I hope they install the new aluminum frame lower intake manifold gaskets for you. And, if your upper intake manifold is original or has a lot of miles on it, you should have it replaced at the same time. To find out how old your upper intake manifold is, take a look at this Techinfo article:

1995 SLE
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Old 09-08-2006, 11:17 AM   #12
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Default LIM

If the shop does not do the LIM gasket its just a band aid approach to the problem IMO.
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