Quick UIM Question! - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-08-2006, 01:35 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Feb 2006
Posts: 220
Thanks: 0
Thanked 0 Times in 0 Posts
NCCamper is on a distinguished road
Default Quick UIM Question!

Hey folks ~

I have my '93 in the shop right now, and have been advised the the UIM gasket is leaking both oil and some coolant. My mechanic wants to change it, but is certain that he should change the UIM itself. Now I thought it was just the Series II that had the problem, but he says some of the Series I had the plastic plenum also. Here'* a photo of the engine:



Can anyone tell me if this is the culprit causing the trouble in the Series II engines? My mechanic said he would rather not touch the UIM gasket without replacing the plenum. ANd the leaks helped the rear tranny mount fail quicker than normal, so I really need to get it changed, so it'* a new UIM for me! The good news is that this appears to be the source of all my leaks (so I can change my sig line!).

Thanks for your help.
John
NCCamper is offline   Reply With Quote
Old 03-08-2006, 01:41 PM   #2
Senior Member
Posts like a Northstar
 
Join Date: Jan 2005
Location: Richfield, MN
Posts: 781
Thanks: 0
Thanked 0 Times in 0 Posts
alec_b is on a distinguished road
Default

Yes you do have a composite (plastic) intake. They HAVE been known to fail, just on a much smaller scale than the SII engines. Dorman i believe also makes a kit for your engine, i think i noticed one while flipping through their latest catalog. I'd say go for it, and if he thinks the plenum is the way to go then do the whole thing, just like the SII guys do.
alec_b is offline   Reply With Quote
Old 03-08-2006, 01:52 PM   #3
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Feb 2006
Posts: 220
Thanks: 0
Thanked 0 Times in 0 Posts
NCCamper is on a distinguished road
Default

As a matter of fact, Dorman is the name he mentioned. Now, let'* see if he recommends working on the LIM while he'* in there, as so many have recommended here.

Thanks,
John
NCCamper is offline   Reply With Quote
Old 03-08-2006, 01:55 PM   #4
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Honestly. I'd get a second opinion on that UIM needing to be replaced.

I haven't heard or seen one personally fail yet. (It'* possible...I haven't seen it though) As for it causing the trans mount to go quicker..did he elaborate on that?

I would buy upper and lower manifold gasket sets, and only replace the upper manifold if it was bad.
BillBoost37 is offline   Reply With Quote
Old 03-08-2006, 02:00 PM   #5
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Feb 2006
Posts: 220
Thanks: 0
Thanked 0 Times in 0 Posts
NCCamper is on a distinguished road
Default

The tranny mount in the rear (or what was left of it) was coated in oil and other leakage. Basically, these leaks caused the rubber in the mount to decay prematurely. I saw the mount myself, and there is no rubber left.

It makes snese to me; do you agree this is probable?

Thanks,
John
NCCamper is offline   Reply With Quote
Old 03-08-2006, 02:08 PM   #6
Senior Member
True Car Nut
 
Join Date: Oct 2005
Location: Central Florida
Posts: 7,030
Thanks: 0
Thanked 0 Times in 0 Posts
lash is on a distinguished road
Default

I agree with Bill on double checking the UIM itself, to see if it is really bad before replacing it. On the rear Tranny mount, I recall jr's3800 mentioning that his have failed more than once, so while the oil MAY have contributed, it might just be coincidence.

Also, I would also have the LIM gasket changed while you are at it, as mentioned. We know that is a failure mode and the extra labor involved is only incremental since he'* already almost there.
lash is offline   Reply With Quote
Old 03-08-2006, 02:18 PM   #7
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

That'* the reason I wanted to know if he based it on anything. Yeah..it could decay quicker with goop on the motor mount.
BillBoost37 is offline   Reply With Quote
Old 03-08-2006, 03:24 PM   #8
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Feb 2006
Posts: 220
Thanks: 0
Thanked 0 Times in 0 Posts
NCCamper is on a distinguished road
Default

Huh? What does this mean: "Anyone believe everything they read?" in Billboost'* sig line. I just noticed it.

Thanks,
John
NCCamper is offline   Reply With Quote
Old 03-08-2006, 03:28 PM   #9
Senior Member
True Car Nut
 
Join Date: Oct 2005
Location: Central Florida
Posts: 7,030
Thanks: 0
Thanked 0 Times in 0 Posts
lash is on a distinguished road
Default

Lol, it'* referring to the quote that follows... :P
lash is offline   Reply With Quote
Old 03-08-2006, 03:28 PM   #10
Senior Member
True Car Nut
 
Join Date: Jul 2004
Location: Twin Falls, Idaho
Posts: 7,545
Thanks: 0
Thanked 1 Time in 1 Post
Hans is on a distinguished road
Default

the uims dont fail the gaskets do

My gasket is trashed and needs to be replaced- coolant is leaking out about 1/2 gallon every few months) but It is too cold outside to rip everything apart (well mainly getting the TB off is the hard part on the l27s)
Hans is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Quick VATS question ... Update w. airbag light question zigmeisterxiv 1992-1999 1 02-10-2010 08:42 PM
Quick UIM Question anathema05 1992-1999 6 11-23-2009 10:30 PM
UIM and LIM replaced now leaking coolant out of UIM gasket Paul1981 2000-2005 10 12-21-2007 11:05 PM
QUICK! QUICK! SPEED! QUICK! ferullo0 Performance, Brainstorming & Tuning 3 05-07-2007 05:09 PM
UIM Removal with pics and a question or two nick s 1992-1999 21 11-06-2005 10:55 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:47 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.