UIM failure symptoms - 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 05-18-2007, 09:06 PM   #1
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Default UIM failure symptoms

Can anyone provide me with the symptoms of a UIM failure or pictures of what it looks like? Or point me in the right direction?

Thanks!
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Old 05-18-2007, 09:09 PM   #2
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Old 05-18-2007, 09:36 PM   #3
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Okay, thanks! Are there visible symptoms of the leak around the EGR and TB without taking the TB off?

I recently got the car with 73000 miles and haven't noticed a drop in coolant levels...
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Old 05-18-2007, 09:47 PM   #4
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Your EGR is buried behind the TB and there'* no way to tell without taking it off. However, even a visual inspection isn't sufficient. The plastic of the UIM around the EGR stovepipe may LOOK ok, but it could be severely corroded and soft.
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Old 05-18-2007, 09:48 PM   #5
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If you take off the snorkel, open the TB blade and look inside witha small flashlight you should be able to see where the egr tube pokes up. Any goop around it would be an indicator of a leak. The dealer usually puts in some stop-leak tar-like additive which explains the goop.

If you don't know the age of your UIM you should be able to figure it out from the clock like markings on top of it, There will be arrows pointing to the day, month, year it was made and if its original I would definitely plan on doing the whole thing (UIM & LIM gasket) as preventative maintenance.
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Old 05-18-2007, 10:26 PM   #6
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One definite symptom is if you're constantly topping off the coolant reservoir, and you don't know where the coolant (Dex-Cool if you're still using it) is going.

(Oops! Nevermind. I just reread your second post )
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Old 05-18-2007, 10:38 PM   #7
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The article is in regard to Series II owners, do Series 1 owners have to worry about this problem?
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Old 05-18-2007, 10:46 PM   #8
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No, the Series I has an aluminum upper intake if I remember correctly. The UIM failure is a Series II problem.
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Old 05-18-2007, 11:48 PM   #9
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Series 1 only has an aluminum upper through PART of 1992. All others are plastic, but don't have the problem nonetheless. The problem started in 1995.

This topic is in the wrong section. Please don't post mechanical topics in General Chat. The Forum sections are very well described.

Moving to 92-99.
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Old 05-19-2007, 01:43 AM   #10
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Keep in mind that the LIM gasket is also prone to failure. Symptoms there, beside losing coolant, is that in the earlier stages, you may see coolant starting to wick its way up the LIM bolts.
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