The end of UIM deaths? - Page 2 - 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 10-05-2007, 12:49 PM   #11
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Default Re: UIM

Quote:
Originally Posted by SSEBONNE4EVA
Blocking a lower intake that has a metal upper is one thing, but blocking off a plastic intake IMO is looking for trouble with the heat and expansion extremes and cold climates in the northern states.
I'm still running the original EGR pipe touching the plastic with no issues. I simply modified the lower support braket to provide air flow to the egr flex pipe.
Should it go I will install a sleeved upper and reduced dia EGR pipe.
If anything, removing the coolant flow from the UIM will reduce the heat and expansion that you'd see in the nylon. The only adverse side affect is you loose your protection against the TB blade sticking to the inner walls of the TB.

Given how warm the air in the intake gets, if a TB blade actually froze, it would only be a matter of waiting a few minutes (tops) for it to get nice and warm.

The more I think about this (and now knowing about the bypass on the LIM), the more I like it.
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Old 10-05-2007, 02:42 PM   #12
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Hello Mkaake.

Hummm something like over sized 1/8”aluminum pipe plugs?

As you know the coolant passages are interconnected in the lower intake manifold and the belt tensioner assembly. Looks like the coolant system was designed to keep working with the throttle-body passages plugged and the heater core plugged.


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Old 10-05-2007, 02:58 PM   #13
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I've had my TB ports blocked off for a while now without any TB icing related issues.
I may not be in the coldest of climates in the winter but it gets down there.
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Old 10-05-2007, 06:06 PM   #14
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I'll be plugging one this weekend, but I'll post some details after it'* all said and done...

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Old 10-05-2007, 06:17 PM   #15
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Probably the best picture I have of the twenty cent mod
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Old 10-05-2007, 06:25 PM   #16
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Quote:
Originally Posted by BillBoost37
the twenty cent mod
Did you JB Weld those afterward or secure them in some other way? Bob and Tom didn't tell me about this mod.


On another note, how important could we estimate is the need to bypass those coolant ports? I currently have a sleeved UIM and reduced diameter stovepipe, and thus far it seems to be working fine. Would it be in a person'* best interest to take the time to block the coolant ports, or simply wait until the next convenient time the LIM is exposed?
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Old 10-06-2007, 03:05 AM   #17
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Seems like if you've already got a sleeved/reduced unit in place, you should be good for a long while. The main two reasons that I'm also starting to like the idea of blocking them off entirely are: 1) It'* dirt cheap (and anyone will tell you, I'm all about not spending money). 2) It would seem to be completely permanent and failure-proof.

That said, I have what looks to be a Dorman on mine, and no sign of failure yet. If not for the nylon LIM gasket carriers (which I shudder when I imagine their condition), I'd probably leave it alone until I saw some sign of failure.


I'll be heading down to assist mkaake with this weekend'* project. We have a good idea of what we're going to do... but I won't spoil things and go there quite yet. Expect a full report with pictures though, from at least one of us.

Quote:
Originally Posted by mkaake
On that point, I can assure you that the coolant flow in the S2 upper was for the purpose of heating the TB. If they had really wanted to cool the EGR area, they would have done it with more than a supply and return to the TB, and they would have done it uniformly around the bore.
That'* a very good point there. Being in molding, I know very well that the layout of the coolant passages there is far less than ideal for removing heat from the area of the EGR passage. It just didn't occur to me for some reason.

I do wonder though if it might be wise to fill the UIM coolant passages with something that will conduct heat better than air (epoxy, or some other filler) to help disperse the heat from the walls of the EGR passage? It might be excessive, but then again, perhaps it couldn't hurt? I, too, am just thinking aloud. An EGR leak into those former coolant passages is probably mostly harmless. It IS a dead end at both the LIM and TB, after all. Still, if it were mine, and I had the time, I might just fill it with JB weld for the peace of mind.
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Old 10-08-2007, 07:15 AM   #18
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Quote:
Originally Posted by theJMFC
Seems like if you've already got a sleeved/reduced unit in place, you should be good for a long while. The main two reasons that I'm also starting to like the idea of blocking them off entirely are: 1) It'* dirt cheap (and anyone will tell you, I'm all about not spending money). 2) It would seem to be completely permanent and failure-proof.

That said, I have what looks to be a Dorman on mine, and no sign of failure yet. If not for the nylon LIM gasket carriers (which I shudder when I imagine their condition), I'd probably leave it alone until I saw some sign of failure.


I'll be heading down to assist mkaake with this weekend'* project. We have a good idea of what we're going to do... but I won't spoil things and go there quite yet. Expect a full report with pictures though, from at least one of us.

Quote:
Originally Posted by mkaake
On that point, I can assure you that the coolant flow in the S2 upper was for the purpose of heating the TB. If they had really wanted to cool the EGR area, they would have done it with more than a supply and return to the TB, and they would have done it uniformly around the bore.
That'* a very good point there. Being in molding, I know very well that the layout of the coolant passages there is far less than ideal for removing heat from the area of the EGR passage. It just didn't occur to me for some reason.

I do wonder though if it might be wise to fill the UIM coolant passages with something that will conduct heat better than air (epoxy, or some other filler) to help disperse the heat from the walls of the EGR passage? It might be excessive, but then again, perhaps it couldn't hurt? I, too, am just thinking aloud. An EGR leak into those former coolant passages is probably mostly harmless. It IS a dead end at both the LIM and TB, after all. Still, if it were mine, and I had the time, I might just fill it with JB weld for the peace of mind.
Yeah - I can't think of any reason to bother filling them. But then, I can't really think of any reason not to fill them either...

If time permits later today, I'll make a post of what we did over the weekend - initial results are very positive.
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Old 10-08-2007, 03:19 PM   #19
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I had to bail out before the filling of fluids and startup, but wow. An intake job goes a lot faster when you've done one before. We probably only spent about 2 hours on actual R&R work (and 3 hours of driving to get parts and supplies that we forgot). The first time, we probably spent at least twice that...

I'll leave the fun details for mkaake to report, since I forgot my camera.
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Old 10-17-2007, 12:29 AM   #20
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Is there any update on this? I'd be interested to know how it'* working out...
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