Can anyone give any feedback on Bob Dillon's UIM Fix - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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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 10-18-2005, 11:56 PM   #1
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Default Can anyone give any feedback on Bob Dillon'* UIM Fix

How is the method of repair look to the naked eye to you when the UIM arrived?
Is it functioning as promised?
Is this an option you heard about or did you gamble on trying it to see if it did or not worked because of the cost.
I was a tool and die maker in my younger years and I have an idea of how he fixes them, but does it work and last for many miles or is t a short term fix?
If you have any results from using his product please state them because they are welcomed but please be honest.
97 SE SLE 40th
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Old 10-19-2005, 01:23 AM   #2
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Take a look at this post to get a little more background and to see a UIM sleeve procedure inspired by the KenCo company who pioneered the sleeve and reduced diameter pipe fix several years ago.

Long-term test results for stainless steel UIM sleeves are not available yet. No one (at least that we know about) has installed stainless steel sleeves for much more than 6 months. Bob D. just went a more elegant way by using adjustable reamers to more accurately cut away the damaged and excess plastic to provide room to install a 7/8" ss sleeve.

I have only put about 8000 miles on my sleeved and re-piped intake. The "standard fix" is to replace the UIM and not do anything with the stovepipe or sleeve. The replacement UIMs are supposed to be strengthened in critical areas making them less prone to failure. A standard fix should go at least as long as some of the less robust originals, - say 60,000 miles. For most guys, that'* good enough, and they don't care to install a smaller pipe (as GM did in '99) or to sleeve the upper in an attempt to provide a more permanent fix.

The other problem is that even if you fix the upper permanently, the jury is still out on the longevity of the lower intake manifold gaskets, which are also known to fail.

Those of us who don't ever want to see an intake manifold failure again and who don't want to spend a lot of money have chosen to sleeve the upper, install a reduced diameter pipe, flush and change coolant periodically, install new design lower intake gaskets, and 180* thermostats.

Others are working on adapting the new series III metal UIM to the series II, but have not as yet posted here about current availability.

1995 SLE
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Old 10-19-2005, 08:07 AM   #3
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I also have one of Bob'* upper intake manifolds. I am one of the "lucky" ones though because my lower intake manifold stove pipe is already the smaller diameter (as talked about in the thread that Bill has a link to). The best we can do is make an educated guess as to which year that smaller EGR stove pipe was this point we think it was started in 1999. The smaller stove pipe keeps those hot air gasses away from the plastic composite upper.

Furthermore, the sleeved upper that I got from Bob has worked wonderfully. I don't have a time lapsed progression of how it'* performed, but I have no reason to believe that it'* not doing well. I have about 10,000 miles on it. I likely won't yank it back off for another 40,000 least. At that point I'll be sure to take plenty of pictures.
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