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.

Oh Crap, UIM or Engine Failure?

Thread Tools
 
Search this Thread
 
Old 08-19-2005, 08:09 PM
  #1  
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
95greense's Avatar
 
Join Date: Aug 2003
Posts: 12
Likes: 0
Received 0 Likes on 0 Posts
95greense is on a distinguished road
Default Oh Crap, UIM or Engine Failure?

Just got my 95 SE all back up to snuff. New ECM, struts, tires, brakes, alignment, etc.

Then today, it started sputtering and I just *barely* made it into my driveway. Now it'* hydrolocked I think. Cyl #3 is full of OIL (not antifreeze). Is this an UIM problem?
Old 08-19-2005, 09:26 PM
  #2  
Senior Member
True Car Nut
 
markwb's Avatar
 
Join Date: Oct 2002
Location: Groton, CT _NEBF 05, 06, 07_
Posts: 2,703
Likes: 0
Received 0 Likes on 0 Posts
markwb is on a distinguished road
Default

Valve guides?
Old 08-19-2005, 09:27 PM
  #3  
Senior Member
Posts like a Camaro
 
Bob Dillon's Avatar
 
Join Date: Feb 2005
Location: Gilroy, California
Posts: 922
Likes: 0
Received 6 Likes on 6 Posts
Bob Dillon is on a distinguished road
Default

coolant in the oil? Bottle empty?

Pull the plugs and crank it. It water comes out, yep.

If it'* your daily driver and you need a quick fix, PM me.
Old 08-20-2005, 12:48 AM
  #4  
Junior Member
Posts like a Ricer Type-R
 
willwren's Avatar
 
Join Date: Aug 2002
Posts: 11
Likes: 0
Received 4 Likes on 4 Posts
willwren is on a distinguished road
Default

At this point, I'd be tempted to simply start tearing it down. It'll speed up the diagnosis and the repair.
Old 08-20-2005, 11:58 PM
  #5  
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
95greense's Avatar
 
Join Date: Aug 2003
Posts: 12
Likes: 0
Received 0 Likes on 0 Posts
95greense is on a distinguished road
Default It was the UIM gasket

The plastic gasket was split around the area of the little pipe that comes out of the manifold. Replaced the whole UIM, cleaned injectors, throttle body, etc. Man was that nasty. Runs awesome now. Did I err by not replacing the head gaskets while I had it partially torn apart? What kind of life can I expect from the engine based on the somewhat limited facts I've put out this far? 50k more miles??

One other thing, we put Dexcool in it, although the old stuff was the green coolant. Will this be a problem? I would have used green stuff but my dad did it while I was away.
Old 08-21-2005, 12:13 AM
  #6  
Junior Member
Posts like a Ricer Type-R
 
willwren's Avatar
 
Join Date: Aug 2002
Posts: 11
Likes: 0
Received 4 Likes on 4 Posts
willwren is on a distinguished road
Default

First of all, the head gaskets rarely fail.

Secondly, I hope you changed the oil before your crank bearings and rods rust.

Third, I'm not a fan of dexcool, although some have switched. I hope you didn't mix them, though, otherwise flush immediately. They're not compatible. Did you use the improved UIM?
Old 08-21-2005, 12:51 AM
  #7  
Senior Member
Posts like a Camaro
 
Bob Dillon's Avatar
 
Join Date: Feb 2005
Location: Gilroy, California
Posts: 922
Likes: 0
Received 6 Likes on 6 Posts
Bob Dillon is on a distinguished road
Default

95greense: Could I have your old UIM? I'll pay postage. You can use the shipping container the new one came in.

I'm sleeving them for members here who have failed UIMs.
Old 08-21-2005, 10:20 AM
  #8  
Junior Member
 
vital49's Avatar
 
Join Date: Mar 2003
Location: Purgatory
Posts: 1
Likes: 0
Received 2 Likes on 2 Posts
vital49 is on a distinguished road
Default

Did you change the lower intake gaskets, too? If you run into this again, and you didn't change them, you should consider doing it. IMO, the lower intake gaskets are just as important to change as the lousy GM UIM.
Old 08-21-2005, 11:14 AM
  #10  
Senior Member
Certified GM nut
 
SSEBONNE4EVA's Avatar
 
Join Date: Feb 2004
Location: CT
Posts: 2,099
Likes: 0
Received 1 Like on 1 Post
SSEBONNE4EVA is on a distinguished road
Default uim

Yes do the lowers also. you'll be glad you did.


Quick Reply: Oh Crap, UIM or Engine Failure?



All times are GMT -4. The time now is 08:58 AM.