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Old 08-05-2009, 01:42 PM   #1
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Default Please verify UIM Gasket Part

I just want to confirm, is the gasket for the UIM 89017554? On the GM parts website it'* called a Plenum gasket. I also found it on RockAuto as a set, MS95812. It appears this one comes with the Throttle Body gasket?

And also, after more looking on Rock Auto, they have the upper gasket separate, but they show a couple varieties. One is OEM and another is for the Dorman unit only. I had my UIM replaced over a year ago but I'm not certain which it is. Is there a way to determine what it was replaced with, or do I not need to worry about it?

Last edited by Grimm; 08-05-2009 at 01:53 PM.
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Old 08-05-2009, 02:07 PM   #2
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Default Hope this helps.

I can't verify the part numbers, but I can confirm that the intake manifolds are also called plenums. (I had mine replaced last year.)
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Old 08-05-2009, 02:36 PM   #3
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it "should" be the same as the OEM part. However it is possible the gasket is slightly different as the plenums are sometimes different.

What type of issue are you having, a vacuum leak?
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Old 08-05-2009, 03:00 PM   #4
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Well, long story short I'm kicking myself because the upper puked in January '08 in the mechanic'* parking lot when I was having brakes done (great timing there), but he insisted I didn't need to worry about the lower. I had changed out the DEX when I bought it three years ago, so I thought maybe I would be safe on the lower so I agreed. This winter we had a couple weeks of temps around 0-10 degrees and it lost a couple inches of coolant. The oil has appeared fine, and I just see a little pooling of coolant on the front top of the LIM, and a little wetness on the sides. I've kept an eye on it, and it'* lost an inch or so of coolant since then. It'* interesting because I can check it over a month or more and it doesn't lose anything, and then a couple weeks later it will be down a quarter inch.

So I'm planning to try and tear it down in the next few weeks and hopefully also do the valve cover gaskets and plugs/wires. First I have two shot rear shocks I need to tackle.

I'll take a look at the upper for markings, but something is telling me it was the Dorman, but I can't remember for sure.

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Old 08-05-2009, 03:38 PM   #5
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Oh..piece of cake. The gasket is reuable. It'* a rubber inlaid job that I've reused w/o issues.
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Old 08-05-2009, 03:55 PM   #6
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OK cool! I haven't looked at the engine yet or delved into the process too much, but I assume I will still need to remove the UIM from the LIM when I tear it down?

What do you think I'm looking at for time to do the intake, valve covers and plugs/wires? Ten hours?
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Old 08-06-2009, 08:38 AM   #7
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All depends on your skill and work ethic.

On an 96-99 you don't need to pull the accessory tensioner assembly or coil pack bracket. On the 2K plus you do pull the tensioner assemby. This adds a few minutes.

I can zip this out in 2 hours, with air tools for disassembly and a die grinder with gasket cleaning 3m pad on it. Takes all of the torture out of the job.

Give yourself 10 hours and you will probably finish in 5 hours.
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