1995 Bonneville SE Catalytic Converter Problem - 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 05-12-2012, 09:56 AM   #1
Junior Member
Posts like a V-Tak
Thread Starter
 
Join Date: Jul 2007
Location: Toledo, OH
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
singingotter is on a distinguished road
Default 1995 Bonneville SE Catalytic Converter Problem

Gentlemen,

I did search the forum and couldn't find any reference or answer to this dilema. The exhaust pipe off of my manifold is 2-3/4" OD leading to the cat and is original. This is my mothers car that I inherited and is all original. All of the OEM direct fits are 2-1/2" OD and the Magnaflow 94800 is 2" ID which will make welding it in a pain and why would the pipe size reduce so much? I couldn't even convince the auto parts store that the donut gasket was too small until I brought the original in along with the original cat. They can't figure it out as with 4 other auto parts stores. I tried a Walker 54413 direct fit but the flange bolt holes are 4" on center and mine is 4-3/4" on-center. My cat also angles up to the exhaust manifold slightly to the passenger side. I really didn't want to have to take this in for a custom cat & weld job, but is that what I'm left with? The reduction of 2-3/4" down to 2" ahead of the cat is my biggest concern. Any ideas? Thank you.
singingotter is offline   Reply With Quote
Old 05-12-2012, 10:02 AM   #2
Retired Administrator

True Car Nut
 
GunsOfNavarone's Avatar
 
Join Date: Apr 2009
Location: Williamsport, PA
Posts: 2,854
Thanked 167 Times in 129 Posts
GunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud of
Default

I bought a direct OEM replacement cat for my 2001 Bonneville. I didn't have the time to put it on, so I went to Velaquez muffler, a larger chain of deep discount muffler shops in Illinois. They took a look at my direct OEM replacement CAT, and mentioned something about it likely would not work because it would have a seal problem. I paid $200 for the CAT at Rock Auto.

They ended up selling me a generic CAT for my Bonny, installed for $100. It has worked fine. It was half the cost, installed, of the OEM part. You may want to see if you have a local deep discount muffler shop that will install a generic CAT for a super low cost.
GunsOfNavarone is offline   Reply With Quote
Old 05-12-2012, 10:13 AM   #3
Senior Member
Posts like a 4 Banger
 
Blackarrow98GP's Avatar
 
Join Date: Apr 2012
Posts: 128
Thanks: 0
Thanked 1 Time in 1 Post
Blackarrow98GP is on a distinguished road
Default

I haven't had to replace the converter on the Park Avenue yet, but Magnaflow does offer a direct fit converter that wasn't available the last time I checked: http://performancepeddler.com/catalo...er-p-3499.html

It might be worth a look, if you haven't already done so.
Blackarrow98GP is offline   Reply With Quote
Old 05-13-2012, 01:24 PM   #4
Junior Member
Posts like a V-Tak
Thread Starter
 
Join Date: Jul 2007
Location: Toledo, OH
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
singingotter is on a distinguished road
Default

Thanks for everyones reply. So this is what I've learned...My car was manufactured on 02/95 and is considered a 94/95 cross-over vehicle. There are no direct fit cat'* available, so a friend offered to weld up the holes and build up the thin spots. He is a really good welder and we spent a few hours fixing things up and it'll last another five years or more. The OEM alloy cat'* last a lot longer than the replacements, so it should be a while before I need to have a custom exhaust made. Now for another dilema...I cant find the 2-1/2" ID exhaust manifold gasket/donut at any of my local autoparts stores. They don't even have one listed. Has anyone had this problem and is there a replacement availble from a different model/year that will fit? My friend who did the welding use to work at a muffler shop and he suggested going to one and having them find a replacemet by size. He said it wouldn't be cheap, but I don't care, I just want to get this thing put back together and running again. Thanks or everyone'* help.
singingotter is offline   Reply With Quote
Old 05-13-2012, 01:29 PM   #5
Senior Member
Posts like a 4 Banger
 
Blackarrow98GP's Avatar
 
Join Date: Apr 2012
Posts: 128
Thanks: 0
Thanked 1 Time in 1 Post
Blackarrow98GP is on a distinguished road
Default

Maybe you can look up a GM replacement gasket here: http://parts.nalleygmc.com/

Once you have the part#, you can call the local dealers in your area.
Blackarrow98GP is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Walker Catalytic Converter Part # 15817- 96/99 Bonneville fantascp 1992-1999 6 08-22-2006 09:13 AM
Bonneville needs a new Catalytic Converter? SSEimatt93 1992-1999 9 01-06-2004 12:58 AM
Removing my catalytic Converter SSEi94SLEEPER Performance, Brainstorming & Tuning 20 03-21-2003 02:53 AM
MagnaFlow Catalytic Converter - which one? BusMaster007 Performance, Brainstorming & Tuning 10 03-11-2003 11:33 PM
Catalytic converter lifespan? Bob02 General GM Chat 6 03-04-2003 10:13 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 09:37 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.