does this modified UIM look okay? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-10-2006, 05:45 PM   #1
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Default does this modified UIM look okay?

I am installing a Bob Dillon modified UIM and need some advice. Take a look at the following pics and see if this looks overly warped. Between the throttle body and the UIM, I can see the orange gasket. Maybe some of this is normal, but I don't remember if my old one did this or not.

Thanks for any help!



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Old 07-10-2006, 05:49 PM   #2
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I'm not really familiar with SII, but that doesn't look too comforting to me.
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Old 07-10-2006, 05:50 PM   #3
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That does not look normal to me. You should not be able to see any of that gasket.

Were those pics taken after you torqued the three TB bolts?
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Old 07-10-2006, 06:47 PM   #4
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Yes, the pics are after tightening. I removed the uim and put my old one back on, and it had the same gap. I don't know anything about the guy who modifies these, but I'm assuming he must check for unacceptable warpage on the throttle body surface??
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Old 07-10-2006, 06:53 PM   #5
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I believe Bob D does check for warpage.

If your old one was the same..please take something you know to be true and flat..use that to see if your TB is warped somehow.
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Old 07-10-2006, 06:55 PM   #6
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I can bet that the TB is somehow warped if you put it on both and they are both warped. Set you TB down on a flat surface and shine a light at the bottom. See any warpage?
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Old 07-11-2006, 02:47 AM   #7
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That gasket surface is fine. Remember the gasket goes down into a groove in the manifold.

As I remember, that'* a UIM with plugged upper passages as well, so you're just sealing vacuum, not holding coolant coolantpressure.

Boosty, you ever seen a throttle body surface (the throttle body itself, not the UIM surface) that warped? I haven't.
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Old 07-11-2006, 03:32 AM   #8
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I have the same issue with my UIM/TB, and my car seems to run fine. Mine might not show quite as much of the gasket, but there is a visible gap. Run it and see how she performs.
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Old 07-11-2006, 08:33 AM   #9
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Quote:
Originally Posted by Bob Dillon
Boosty, you ever seen a throttle body surface (the throttle body itself, not the UIM surface) that warped? I haven't.
Not at all Bob...however by not ruling out the near impossible..I've found a bunch of problems faster than most in the past.
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Old 07-11-2006, 10:35 AM   #10
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Mine shows a bit of a gap there too, and my UIM is brand new. Doesn't seem to be a problem.
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