Posted: Mon Sep 10, 2012 10:00 am Post subject: Upper Intake Plenum
OK I know the horror stories and I am in the middle of replacing upper and lower gaskets with new upper plenum on my '96 Olds LSS.
On my '05 Imp. Was this defect in the plenum ever revised so that it will not happen on my '05? Thanks.
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In the later model years (99+), GM went to a smaller diameter (5/8”) EGR pipe that creates a 0.065” air gap between the hot pipe and the plastic EGR bore hole in the upper intake. This helps, but does not cure the problem - as we have heard of and seen a few of the newer cars with failed manifolds. But so far, they seem to have a lower failure rate. Only time will tell how the 00-05 3800 Models fare. By early 2006, GM dealerships were seeing a few of the 00-02 models come in for an upper intake replacement due to failure of the unit. So it’s starting to appear that the 2000+ L36 owners need to be watchful as well.
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