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.



Thanks for any info.

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.

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.

no problem

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.

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 !!!