UIM failure plug fouled??? - 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 11-20-2006, 07:10 PM   #1
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Default UIM failure plug fouled???

My car had the uim failure rushing tons of coolant into my engine killin the engine and after i fixed my car I have a hesitation when under medium throttle pressure and the brand new wires arc off on each other chances a plug is fouled? Wasnt like this all the time after the uim replacement but like 1.5k miles after. Also when i put the stovepipe in it never fit snugly but it also cant fit thru the uim hole so i thought it would be fine dunno if that has nething to do ith it or not???
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Old 11-20-2006, 07:43 PM   #2
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If the plug wires are arcing they are the source of your misfire and hesitation.

Replace them and separate them correctly with the stock looms.

Your remarks on the UIM replacement re: the stovepipe are unclear; could you elaborate?
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Old 11-20-2006, 08:17 PM   #3
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the stovepipe never fit into the lim snuggly it as loose
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Old 11-20-2006, 08:29 PM   #4
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I am very concerned about the stovepipe being loose in the UIM. The reason being is the stovepipe'* purpose is to allow the exhaust a pipe up past the composite intake. If not properly inserted into the LIM, exhaust can directly hit the lower portion of the UIM and erode it quickly.

This can cause another UIM failure very soon.
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Old 11-20-2006, 09:18 PM   #5
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Yeah, you want that stovepipe to be tight in the bore. As Boosty says, if the hot stovepipe touches the plastic wall of the UIM, or if it allows the hot exhaust gases to impinge on the plastic, the UIM will deteriorate quickly and likely fail again.

Are you using the stock stovepipe? Do you know which replacement upper was installed?

You have a lot of options to fix this. If you are using the stock 3/4" stovepipe, you can simply remove the throttle body, reach in and lift out the loose pipe. You could then distort the pipe a bit by laying it down along the long axis (so that it will roll) on a hard surface and striking the pipe with a hammer close to one end. You don't want to mis-shape the pipe, just create a slight out of round or oval condition on the end that will go into the LIM. It should be tight enought that you have to tap the pipe down into the bore to seat it.

If you haven't already done so, this would be a good opportunity to install a reduced diameter stovepipe to further protect the plastic. If you have installed a Dorman upper, you can modify the small aluminum stovepipe provided in the kit to fit your LIM, and even shield the stovepipe for additional heat protection. PM me if you are interested in any of these "advanced" options.
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Old 11-20-2006, 10:40 PM   #6
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Its a reduced diameter stovepipe. I bought the uim that is suppost to be a fix to it.
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Old 11-20-2006, 10:50 PM   #7
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Quote:
Originally Posted by 19bonnie95
Its a reduced diameter stovepipe. I bought the uim that is suppost to be a fix to it.
I suspect you have a 5/8" stovepipe inserted into a UIM with a 3/4" hole. Agree, Mr. Buttermore?

I think Bill'* fix described above is reasonable and wouldn't even take much time, and I'd do it at once.
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Old 11-20-2006, 11:33 PM   #8
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..and the plug wires arcing are the same as from this post?

http://www.bonnevilleclub.com/forum/...366&highlight=
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Old 11-21-2006, 12:51 AM   #9
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Mr. Dillon seems to be right on it. It does sound like you may have tried to install the reduced diameter pipe that is designed for the 5/8" LIM bore of 99 and newer L36'* into your 3/4" LIM bore. Did you buy a Dorman kit? Do you still have your old stovepipe? If so, do the fix I suggested with your old stovepipe to save your new upper. If you cannot find or do not have your old stovepipe, any piece of pipe or tubing that measures 3/4" outside diameter can be driven into the LIM to serve as a stovepipe while you work at a better fix. Cut the pipe 1.42" long with a tubing cutter. If you bought the Dorman and have the little .510" x .625" aluminum stovepipe pipe that came with the kit, I can sell you a ring for $5 that you can press onto the .625" shoulder that will adapt it to fit your LIM. This thread explains how that is done.

http://www.bonnevilleclub.com/forum/...ic.php?t=54769

We have seen serious degradation of plastic uppers installed without stovepipes. They can be destroyed in a matter of a couple of weeks, so this is not something to diddle around with.

Please read this Techinfo article. It will explain most of this stuff for you.

http://www.bonnevilleclub.com/forum/...e=article&k=38
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Old 11-21-2006, 02:14 AM   #10
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I wonder if you might have mis-routed your plug wires? Depending on which wires are crossed, the car can run remarkably well most of the time, but very poorly others. It is worth a simple doublecheck.

On the UIM....how long have you been running with the loose pipe? If it is more than a couple of weeks, I would strongly suggest you remove the UIM and very carefully examine the gasket and upper around the EGR bore for damage. You may have to replace the gasket or the gasket and the UIM. Even if both are re-useable, it will be much easier to ensure that the stovepipe is properly seated with the UIM off.
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