Upper Intake Failure Information - Page 7 - 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.

Closed Thread
 
 
 
Thread Tools Search this Thread
Old 07-07-2004, 01:27 PM   #61
Junior Member
 
Join Date: Mar 2003
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
vital49 is on a distinguished road
Default

Quote:
Originally Posted by Ranger
Hey guys, I just joined this forum after reading with great interest about this upper manifold problem. My wifes '96 Bonneville with 106K has been using coolant for several years now. Last summer I realized it was comming from the throttle body gasket and had heard about that problem. I changed coolant, as it was do anyway and added GM sealant tabs. That all but solved the problem. In the last year the coolant level has gone from the hot level to the cold level so it is very slow seepage. After reading all the info here I guess it is time to pull the upper manifold and see what it needs. The Ken-Co fix makes a lot of sense but for $80 I will custom make a new stove pipe and sleeve and use JB Weld for the epoxy (I have a lathe). Hopefuly the manifold is not in too bad of shape and sleeving it will eleviate having to buy a new manifold. If I understand correctly I can buy a new TB gasket seperatly? I wasn't planning on doing the lower as I have not heard of a problem with those until I read 57chevythunders post. Now I am debating it. Don't want to do it again as I suspect it will take me a week to straigten my back up again Any and all suggestions or tips are welcome and appreciated.
I also had a problem with my lowers at only 77,000 miles. They were in just as bad of condition as 57chevythunder'*. If you're going to replace the upper intake, I would just take the extra 2 hours and replace the lower gaskets too. Adding a 180 degree thermostat will prevent this from happening again.
vital49 is offline  
Old 07-07-2004, 04:18 PM   #62
Senior Member
True Car Nut
 
Join Date: Jun 2004
Location: Rochester, NY (college)
Posts: 6,182
Thanks: 0
Thanked 0 Times in 0 Posts
corvettecrazy is on a distinguished road
Default

Hey guys,

I have a new upper on its way but I have a few questions about other things I will need/should do while I am replacing the upper.

1 Should I go ahead and replace the lowers? What else do I need in terms of parts for doing this? (other than the lower intake gasket)

2 What other parts might I need for something like this? (exaple, ANYthing that you needed that you needed for the job other than the normal wrenches and sockets )

3 where do I get a 180 t-stat?? and are they a good idea for a daily driver that seeing a lot of stop and go?

4 It seems the general thoughts are that a new stove pipe is a good idea, BUT what is the main difference between the Ken-co one and the stock one? Hight? width?

Thanks in advance.
corvettecrazy is offline  
Old 07-07-2004, 06:27 PM   #63
Senior Member
Posts like a Turbo
 
Join Date: Jul 2004
Location: Woodstock Ill.
Posts: 214
Thanks: 0
Thanked 0 Times in 0 Posts
Ranger is on a distinguished road
Default

I don't know the exact dimensions of the stove pipe but I think the idea is that the O.D. of the stove pipe is smaller than the I.D. of the sleeve so there is no contact and there is an air space between them. That is how I plan to machine mine. I'm not going to change the stat. Don't want to try to fool the computer. That usually doesn't work. Besides I don't think that will have any effect on EGT (exhaust gas tempurature) which is what I understand is the cause of this problem.
Ranger is offline  
Old 08-09-2004, 04:16 PM   #64
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Jan 2004
Posts: 1,166
Thanks: 0
Thanked 1 Time in 1 Post
mkaake is on a distinguished road
Default

timely bump b/c questions are comin up around here again...
mkaake is offline  
Old 08-10-2004, 03:55 PM   #65
Senior Member
Posts like a Turbo
 
Join Date: Apr 2004
Location: Sheridan Wyoming
Posts: 210
Thanks: 0
Thanked 0 Times in 0 Posts
57chevythunder is on a distinguished road
Default

Say Ranger, Did you ever do the maintenance and upgrade ? -that is, gaskets, plenum, EQG mod, etc.

Please let us know how it went.

Thanks,
Harry
57chevythunder is offline  
Old 08-19-2004, 11:33 PM   #66
Senior Member
Posts like a Turbo
 
Join Date: Jul 2004
Location: Woodstock Ill.
Posts: 214
Thanks: 0
Thanked 0 Times in 0 Posts
Ranger is on a distinguished road
Default

Sorry, haven't been here for a while. Yes got the job done. Took longer than it should have (and a day to straighten my back out) but in my defense I took time out for dinner, took time out to run to the dealer to get some new nuts for the TB mount (had to cut one off and that wasted more time), also took about an hour to machine a new stove pipe. It turned out pretty good. The stove pipe now has a .050 clearance between it and the sleave I made for the manifold. I think that should help keep the manifold from burning through though I never had that problem. My manifold and gasket didn't look to bad for 106K. I was quite surprised. The TB gasket was another story. Flattened completely. Didn't go into the lowers. I talked to a mechanic at the dealer and he said they don't have many failures on those so I decided to leave well enough alone. Put it all back together and it started the first time, no leaks, no spare parts and coolant is holding steady for the last month.
Ranger is offline  
 
 
Closed Thread

Related Topics
Thread Thread Starter Forum Replies Last Post
Upper Intake Failure Supercharged Series 1 Kennginn 1992-1999 24 05-11-2004 10:01 AM
possible series 1 upper intake failure GAMEOVER 1992-1999 4 02-10-2004 10:09 PM
horrific upper intake failure Custom88 General GM Chat 23 02-09-2004 05:53 PM
Upper intake failure gone worse :o( givemebreak General GM Chat 5 12-17-2003 09:09 PM


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 09:58 PM.


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.