Emissions Failure/How many Cats - 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 03-13-2008, 01:17 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Apr 2007
Location: Connecticut
Posts: 43
Thanks: 0
Thanked 0 Times in 0 Posts
93whiteSSE is on a distinguished road
Default Emissions Failure/How many Cats

Ok I looked at some other posts before making this post so to my problem I recently just had a universal high flow magnaflow cat put on and went through emissions and failed, I fear the car may be running a little rich which I may take care of but my numbers were really bad so I was wondering if maybe I need more then one cat on this car? I am not sure how many it has stock for when I got the car it had a welded straight pipe in replacement, anyways here are my emission numbers

HC(PPM)
Limit: 79
Me: 274

CO (%)
Limit:0.42
Me:8.95

I do plan on getting the car tuned up before i re-test but should I also put on another cat or do my problems lay elsewhere?
93whiteSSE is offline   Reply With Quote
Old 03-13-2008, 01:21 PM   #2
Senior Member
True Car Nut
 
Join Date: Sep 2006
Location: Bloomington, MN
Posts: 3,693
Thanks: 0
Thanked 0 Times in 0 Posts
GoldenBullet is on a distinguished road
Default

the car only came with one cat, and since its a new cat i would look somewhere else to see if that is causing the high levels.
GoldenBullet is offline   Reply With Quote
Old 03-13-2008, 01:28 PM   #3
Senior Member
Posts like a Corvette
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default

Your high HC and CO is probably due to pig richness or incomplete combustion...when'* the last time the O2 sensor was replaced? How are your plugs and wires? How'* your cylinder compression?

If you don't get that HC emission under control, it will kill the cat quickly.
agrazela is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Cali emissions delete for a non emissions state gojo83 Performance, Brainstorming & Tuning 6 09-08-2011 03:58 PM
many many elictrical problems TampaSSEi95 Everything Electrical & Electronic 4 12-03-2007 09:00 PM
To "SSE" Echo and Bill,many ,many thanks cvc 1992-1999 1 10-18-2006 05:08 PM
cant say "SOAB" anymore.... (many many pics) FiReDeViL General GM Chat 67 11-06-2003 09:47 PM
Cats and stats #'s mikenkar General GM Chat 0 08-31-2003 04:25 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 07:06 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.