Plenum Question - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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 05-26-2009, 03:41 PM   #1
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Am planning on changing the UIM/LIM gaskets on my '94 bonneville SE. Can't remember but was 1994 a bad year for the plenums ? I'm hoping on just replacing the gaskets or is it wise to do both gaskets and a new plenum.



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Old 05-29-2009, 05:16 PM   #2
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Series II engines have more of the plenum problems then series I but that not saying there is no issues with your series I upper intake. Dorman makes a good replacement upper intake manifold.
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Old 05-30-2009, 10:45 AM   #3
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Thanks Pontiacker94......I thought the series II 3800'* were the culprit, being a cheap bastard, I'll start first with the gaskets but look mine over for any obvious signs of distress.
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Old 05-30-2009, 02:13 PM   #4
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no problem
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Old 05-31-2009, 10:42 PM   #5
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S2'* do have the market cornered on UIM failures. Although the plastic S1'* can fail as well.

Big thing here is checking the LIM gaskets while you are there. I'd be you'll want to replace them.
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Old 06-01-2009, 10:06 AM   #6
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Thanks Billboost37....absolutely!!!!...with the stellar help from this forum I'll be doing both the UIM/LIM. Would never have dreamed about taking on this job without this forum. A tip of the hat to all !!!
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