got UIM off, how do I know if its bad?? - 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 07-01-2006, 07:42 PM   #1
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Default got UIM off, how do I know if its bad??

I got one of the modified UIM'* to replace mine that I assume has failed. My question is, how do I know by looking at it? The oil that was visible when I replaced the uim was very watery, but I don't see any obvious signs of failure?

I'll try to post some pics...[/img]
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Old 07-01-2006, 07:56 PM   #2
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here are some pics of the old part. I guess my problem is that I don't know where the oil runs. I guess the coolant only runs right around the EGR port right where it connects to the throttle body?




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Old 07-01-2006, 09:31 PM   #3
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Did you see any holes where the stove pipe comes through? Coolant passages run around that area. It looks like it'* seen better days to me, but I'm a Ford guy.
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Old 07-01-2006, 10:53 PM   #4
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You may have to poke around a bit where the EGR stove pipe comes through the upper. Does any of the plastic crumble away, or create any holes into the coolant passages?
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Old 07-02-2006, 12:34 AM   #5
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here'* a dumb question, but what is SUPPOSED to be in the area right on top of the lower intake? Air, oil, or coolant? Mine was FILLED with very watery oil. I always assumed that there was only supposed to be air in there...
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Old 07-02-2006, 12:35 AM   #6
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Quote:
Originally Posted by laff66
here'* a dumb question, but what is SUPPOSED to be in the area right on top of the lower intake? Air, oil, or coolant? Mine was FILLED with very watery oil. I always assumed that there was only supposed to be air in there...
Nothing should be there but greasy buildup. I am not sure if coolant runs through there. I take it you drained the oil ASAP, right?
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Old 07-02-2006, 02:45 AM   #7
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Technically ..nothing should be on top of the lower intake. However ..over time the pcv allows the excess pressure into this area and you will get a little oil...but not much and it should end up as a thin later of goop. If you found watery oil..then your upper intake was failing.
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Old 07-03-2006, 08:24 PM   #8
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I had quite a bit of fluid there. I thought it was mostly oil, but when I started soaking it up, there was quite a bit of coolant.

Oh, and sorry for the blurry picture but look what else I found....

http://i71.photobucket.com/albums/i1...6/P1010650.jpg
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Old 07-04-2006, 01:51 AM   #9
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Quote:
Originally Posted by Bonneville94V688
Quote:
Originally Posted by laff66
here'* a dumb question, but what is SUPPOSED to be in the area right on top of the lower intake? Air, oil, or coolant? Mine was FILLED with very watery oil. I always assumed that there was only supposed to be air in there...
Nothing should be there but greasy buildup. I am not sure if coolant runs through there. I take it you drained the oil ASAP, right?
X2! Engine coolant in the oil is seriously bad news for your bearings!!!
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