Would it cause problems to eliminate the catalytic converter - Page 3 - 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 02-20-2008, 03:05 PM   #21
Senior Member
True Car Nut
 
Join Date: Oct 2002
Location: Genoa, Illinois
Posts: 4,013
Thanks: 0
Thanked 0 Times in 0 Posts
Allmachtige is on a distinguished road
Default

From a personal experience: I removed the CAT once on an older Bonnie and I havn't done it since.
Allmachtige is offline   Reply With Quote
Old 02-20-2008, 04:53 PM   #22
Senior Member
Posts like a Northstar
 
Join Date: Aug 2007
Location: Ladysmith B.C. Canada
Posts: 620
Thanks: 0
Thanked 0 Times in 0 Posts
JMH1950 is on a distinguished road
Default

I'm having trouble wrapping my brain around the idea that removing the cat will cause a loss of low end power, but installing a high flow cat is a good idea.

I'm thinking it'* time to replace the cat in both my vehicles because they are both original and have high mileage on them. I will go with magnaflow and get both for less than the cost of one.
JMH1950 is offline   Reply With Quote
Old 02-20-2008, 05:10 PM   #23
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

It'* not a straight "gained power" curve when you free up exhaust flow. At some point, power goes down.
J Wikoff is offline   Reply With Quote
Old 02-21-2008, 01:12 AM   #24
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Feb 2008
Location: Indiana
Posts: 139
Thanks: 0
Thanked 0 Times in 0 Posts
rstrunk is on a distinguished road
Default

I just can't understand why removing the cat would cause any loss in power. The exhaust velocity and back pressure are still present because the exhaust pipe and muffler are still in tact. Most of my mechanical experience comes from old Trans Ams and the first thing we did on any 70'* T/A was to remove the cat and put glass packs on it and the increase in horse power is the best bang for the buck out there. I don't understand why there would be any power loss. My problem is that I am not very familiar with newer computerized engines and didn't know if the computer recognized that the cat was gone and would make the car run bad or not. I just cannot see how the car would lose power when the exhaust is still intact. I could understand it losing power if the exhaust was removed from the manifolds but we are talking a full and complete exhaust system in tact minus the "restrictive" cat. And if I get a high flow cat that means it'* no longer restrictive and would be the same as using no cat. Sorry, I'm just not getting the loss in power that is being spoken of.

Like I said, just wondering if the computer would get bad readings, thus cause the engine ti run bad, if the cat was removed.
rstrunk is offline   Reply With Quote
Old 02-21-2008, 08:15 PM   #25
Senior Member
True Car Nut
 
radomirthegreat's Avatar
 
Join Date: Sep 2006
Location: Indianapolis, IN
Posts: 4,606
Thanks: 0
Thanked 0 Times in 0 Posts
radomirthegreat is on a distinguished road
Default

Hey, Hoosier! You only have one oxygen sensor before the catalytic converter, so your engine can't tell if you remove the converter. However, that is a terrible idea since if your catalytic converter is so plugged up that your car doesn't run right, you can't just remove the blockage and keep your car going badly. You're probably running rich, so please address that first. Have all sensors checked and make sure the car'* running with a proper A/F ratio. Then, when you get your catalytic converter problem taken care of, hopefully with a high flow converter, you'll have a much better car overall.

94s rule!

Also, check this out:
http://www.bonnevilleclub.com/forum/...ic.php?t=93272
radomirthegreat is offline   Reply With Quote
Old 02-22-2008, 03:50 AM   #26
Senior Member
True Car Nut
 
Join Date: Apr 2004
Posts: 4,816
Thanks: 0
Thanked 0 Times in 0 Posts
GonneVille is on a distinguished road
Default

Ed doesn't sell cats. It'* severely illegal to sell a used catalytic, except for scrap.


Also, I'd love to see dyno results on the exhaust issue on the Series 1, but I believe it is documented on the Series 2.
GonneVille is offline   Reply With Quote
Old 02-22-2008, 04:25 AM   #27
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Feb 2008
Location: Indiana
Posts: 139
Thanks: 0
Thanked 0 Times in 0 Posts
rstrunk is on a distinguished road
Default

Quote:
Originally Posted by radomirthegreat
Hey, Hoosier! You only have one oxygen sensor before the catalytic converter, so your engine can't tell if you remove the converter. However, that is a terrible idea since if your catalytic converter is so plugged up that your car doesn't run right, you can't just remove the blockage and keep your car going badly. You're probably running rich, so please address that first. Have all sensors checked and make sure the car'* running with a proper A/F ratio. Then, when you get your catalytic converter problem taken care of, hopefully with a high flow converter, you'll have a much better car overall.

94s rule!

Also, check this out:
http://www.bonnevilleclub.com/forum/...ic.php?t=93272
Fellow Hoosier! Yes, I'll get the other stuff checked out first and address the cat last. now that i see they are reletivly affordable, it should be no problem replacing it with a high flow.
rstrunk is offline   Reply With Quote
Old 02-22-2008, 04:37 AM   #28
Senior Member
True Car Nut
 
radomirthegreat's Avatar
 
Join Date: Sep 2006
Location: Indianapolis, IN
Posts: 4,606
Thanks: 0
Thanked 0 Times in 0 Posts
radomirthegreat is on a distinguished road
Default

Good to see a few steps in the right direction. Good luck fixing it all up. There are lots of knowledgeable people here.
radomirthegreat is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
What electrical problems would cause a vehicle to die? convicted General GM Chat 3 07-29-2013 07:56 AM
Transmission problems? Torque converter?- Cause found! redssei01 2000-2005 6 11-14-2004 09:50 PM
Catalytic converter problems.. SOLVED!!!! matt95ssei General GM Chat 12 10-03-2004 03:53 AM
Eliminate the cat??? Glasuan Performance, Brainstorming & Tuning 18 02-23-2004 02:29 PM
Possible to eliminate AC from the picture? delta88 Performance, Brainstorming & Tuning 6 02-19-2003 10:03 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 07:11 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.