Critical L36 Upper Intake Manifold Info....for 2000+ owners - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-04-2006, 06:17 PM   #1
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Default Critical L36 Upper Intake Manifold Info....for 2000+ owners

Maybe you thought like I did that the problem ended in 1999. That was either a rumor or a false hope.

I have in my lap the AC Delco UIM off of EK98'* car. His is obviously a 98, but his upper (second one on the car) was manufactured on:

March 2nd, 2002 <<<<<<remember this date while you look at the EGR passage in the pics below:

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I firmly believe it'* only a matter of time before we start seeing more NEWER cars, particularly 2000 and newer begin to fail. Be VERY watchful of your idle quality, smell of the exhaust, and coolant levels.
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Old 10-04-2006, 06:21 PM   #2
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Bill...This may be one to toss into the 00+ mechanical area with a link..

I understand you put it here for better exposure.
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Old 10-04-2006, 06:26 PM   #3
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I put it here because it relates to 1995-2005 (and even newer GP'*, not to mention the various Buick and Olds owners here).
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Old 10-04-2006, 06:37 PM   #4
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Bill, are we positive that is a replacement ACDelco part?
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Old 10-04-2006, 06:42 PM   #5
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It is an AC Delco. Identical to every production L36.

Delco manufactured in 2002.
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Old 10-05-2006, 09:17 AM   #6
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Dumb question, but does the Shortstar (3.6 V6) have this problem as well?

I have 30k on my Dorman on the '96 SE and so far so good.
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Old 10-05-2006, 09:56 AM   #7
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Quote:
Originally Posted by CFoote
Dumb question, but does the Shortstar (3.6 V6) have this problem as well?
Not that we know of. But, we don't follow that engine as closely as we do the Bonneville power plants.
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Old 10-05-2006, 10:05 AM   #8
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This doesn't surprise me in the slightest. The replacement manifolds made after 2000 don't have any more real protection than the originals, unless you consider a little heavier plastic material around the coolant passages sufficient.

As far as I know, there was no better EGR standpipe protection provided.

That is why I took the opportunity to stock a replacement UIM while I could get a good deal and have the time to properly shield the passages from the EGR pipe. This even though my UIM replacement by dealer was done in 2004 with a 2004 vintage UIM.
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Old 10-06-2006, 08:15 AM   #9
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My uim was manufactured like in 2003 went out 3 months ago fixed with a one that is supposted to stop this problem.
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Old 10-07-2006, 02:13 PM   #10
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Quote:
Originally Posted by CFoote
Dumb question, but does the Shortstar (3.6 V6) have this problem as well?

I have 30k on my Dorman on the '96 SE and so far so good.

Ive done a pretty fair amount of research on the 3.5 and I dont know of any problems with the UIM or LIM gaskets, or any common engine problems at all for that matter.

It does have the same composite UIM though, but the problem with the 3.8 is a design flaw, not because its made of composite material.
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