Results 1 to 15 of 15

Aftermarket Exhaust Woes...

This is a discussion on Aftermarket Exhaust Woes... within the General Help forums, part of the LSx Technical Help Section category; So I got rid of my slp longtube headers after they kept getting smashed. I put stock headers on and ...

  1. #1
    Impwnded Smkn_TA's Avatar
    Join Date
    May 2007
    Location
    Davenport, Iowa
    Age
    29
    Posts
    1,977

    Bright Red
    1999 Trans Am Ws6

    Aftermarket Exhaust Woes...

    So I got rid of my slp longtube headers after they kept getting smashed. I put stock headers on and kept catback slp loudmouth exhaust. I hooked everything back up and now I drive ses light comes on, and goes off, on and off. No pattern at all. I managed to get to autozone with out it going off and the code was rear o2 sensor not reading, so I bought two o2 sensors. Reset the pcm, and I was fine for over a month, now it started doing it again. What gives. I took the cats off yesterday and they looked wide open still. I can't warrant spending 300 dollars for a hypertech to remove rear o2 sensors. Any tips as to what the deally-o is.

  2. #2
    Senior Member TransAm11973's Avatar
    Join Date
    Nov 2007
    Location
    in my Trans Am
    Posts
    2,630

    Black
    2000 Trans Am WS6

    did you get ur ride tuned for the LT's?? also when is the last time you cleaned ur MAF? Mine was throwing O2 codes one time, and I cleaned the MAF...and it straightened itself out

  3. #3
    Bat Outta Hell
    Join Date
    Jul 2007
    Location
    Southeast Texas
    Posts
    84

    Black
    96 Z28Ttops, 98 Z28 Conv.

    What does it matter that it is reading that code??? Most people delete the o2 sensor readings when they get a tune, i dont understand what good this does??? I wouldnt think anything bad could happen if you kept driving with that reading, could it?? Could anything f*ck up if you kept driving it like it is????

  4. #4
    Senior Member bigrondownhiller's Avatar
    Join Date
    Feb 2006
    Location
    Orange County, NY
    Age
    42
    Posts
    2,674

    Black
    1996 Camaro Z28 vert

    How are the wires going to the rear O2's?

  5. #5
    Impwnded Smkn_TA's Avatar
    Join Date
    May 2007
    Location
    Davenport, Iowa
    Age
    29
    Posts
    1,977

    Bright Red
    1999 Trans Am Ws6

    When you buy new o2 sensors it comes with a new harness for them, but the other ends on the car looked fine, they were tucked nicley up out of harms way.

  6. #6
    Impounded
    Join Date
    May 2008
    Location
    Verdigris, OK
    Posts
    2,165

    NBM
    99 z28

    Quote Originally Posted by NightRiderZ View Post
    What does it matter that it is reading that code??? Most people delete the o2 sensor readings when they get a tune, i dont understand what good this does??? I wouldnt think anything bad could happen if you kept driving with that reading, could it?? Could anything f*ck up if you kept driving it like it is????
    ive had my z almost 3 years now. about a week after i got it i had my cats cut off/replaced with straight pipe and then a flowmaster 40 put on. i have not had any tune whatsoever(no deletion of o2 sensors). my ses is still on showing p0420(bad cats, i believe) and ive yet to encounter any problems as a result. this is also my daily driver.

  7. #7
    Member km346's Avatar
    Join Date
    Nov 2008
    Location
    masssaaechuuuseettes
    Posts
    241

    Silver
    1998 hardtop SS

    Quote Originally Posted by Boomer Sooner View Post
    ive had my z almost 3 years now. about a week after i got it i had my cats cut off/replaced with straight pipe and then a flowmaster 40 put on. i have not had any tune whatsoever(no deletion of o2 sensors). my ses is still on showing p0420(bad cats, i believe) and ive yet to encounter any problems as a result. this is also my daily driver.

    p0420 reads catalyst efficiency bellow threshold. This is basically your rear o2 sensors comparing the reading with the front o2's and telling your ecu that your cats are no longer doing what they should be doing. If your running a car without cats you can get around this by either buying o2 sim's or getting the code tuned out with a tuner program (hptuners etc.) You will NOT do any harm to the vehicle driving around throwing a p0420 code. However if you have to pass obd2 emissions you will fail.
    Last edited by km346; 11-11-2008 at 08:49 AM.

  8. #8
    Impounded
    Join Date
    May 2008
    Location
    Verdigris, OK
    Posts
    2,165

    NBM
    99 z28

    Quote Originally Posted by km346 View Post
    p0420 reads catalyst efficiency bellow threshold. This is basically your rear o2 sensors comparing the reading with the front o2's and telling your ecu that your cats are no longer doing what they should be doing. If your running a car without cats you can get around this by either buying o2 sim's or getting the code tuned out with a tuner program (hptuners etc.) You will NOT do any harm to the vehicle driving around throwing a p0420 code. However if you have to pass obd2 emissions you will fail.
    ive noticed no harm like you mentioned.

    also, i dont have to worry about emissions here in okla

  9. #9
    Impwnded Smkn_TA's Avatar
    Join Date
    May 2007
    Location
    Davenport, Iowa
    Age
    29
    Posts
    1,977

    Bright Red
    1999 Trans Am Ws6

    No emissions here in Iowa either.

  10. #10
    Bat Outta Hell
    Join Date
    Jul 2007
    Location
    Southeast Texas
    Posts
    84

    Black
    96 Z28Ttops, 98 Z28 Conv.

    Hehe thats what i thought.....i dont know about you guys, but im poor!!! I cant afford to drop money into my car just to make a light turn off!!!!

  11. #11
    Rockin the Ruckus! 02Sweet's Avatar
    Join Date
    May 2008
    Location
    Line Lexington, PA
    Posts
    2,670

    NBM
    2002 z28 camaro

    Quote Originally Posted by NightRiderZ View Post
    Hehe thats what i thought.....i dont know about you guys, but im poor!!! I cant afford to drop money into my car just to make a light turn off!!!!
    I will be going through the same problem once the headers go on with no cats. I will probably wait to do anything with the code till I get my rear changed then i can justify the paying for the code removed.

    The o2 sims seem kind of a waste of money to me

  12. #12
    Senior Member bigrondownhiller's Avatar
    Join Date
    Feb 2006
    Location
    Orange County, NY
    Age
    42
    Posts
    2,674

    Black
    1996 Camaro Z28 vert

    Quote Originally Posted by NightRiderZ View Post
    What does it matter that it is reading that code??? Most people delete the o2 sensor readings when they get a tune, i dont understand what good this does??? I wouldnt think anything bad could happen if you kept driving with that reading, could it?? Could anything f*ck up if you kept driving it like it is????
    Nothing bad will happen but what if some other code comes up? You wont know because the light is already on.

  13. #13
    Impounded
    Join Date
    May 2008
    Location
    Verdigris, OK
    Posts
    2,165

    NBM
    99 z28

    Quote Originally Posted by bigrondownhiller View Post
    Nothing bad will happen but what if some other code comes up? You wont know because the light is already on.
    this is the sole reason i have my car scanned for new codes atleast 2-3 times a month at autozone.

  14. #14
    Rockin the Ruckus! 02Sweet's Avatar
    Join Date
    May 2008
    Location
    Line Lexington, PA
    Posts
    2,670

    NBM
    2002 z28 camaro

    Quote Originally Posted by Boomer Sooner View Post
    this is the sole reason i have my car scanned for new codes atleast 2-3 times a month at autozone.
    If u are going to get ur car scanned that much I would find a local tuner to remove the code u need can't be more than 75 for that

  15. #15
    Impounded
    Join Date
    May 2008
    Location
    Verdigris, OK
    Posts
    2,165

    NBM
    99 z28

    Quote Originally Posted by 02Sweet View Post
    If u are going to get ur car scanned that much I would find a local tuner to remove the code u need can't be more than 75 for that
    eventually i will. but for the most part, its really no inconvenience.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Wanted: c5 aftermarket exhaust
    By camarospade in forum Parts Wanted / Trade
    Replies: 0
    Last Post: 09-26-2010, 09:04 AM
  2. Borla Exhaust - Aftermarket Insider
    By Ed Blown Vert in forum Almost Anything Goes
    Replies: 0
    Last Post: 02-04-2009, 11:20 AM
  3. 04 Gto Aftermarket Exhaust (no flowmaster)
    By Raoul-Duke in forum Parts Wanted / Trade
    Replies: 1
    Last Post: 01-24-2008, 03:20 PM
  4. used aftermarket gto exhaust..
    By Raoul-Duke in forum Parts Wanted / Trade
    Replies: 0
    Last Post: 10-28-2007, 03:31 PM
  5. M6 Woes
    By wooddaniel in forum Firebird / WS6
    Replies: 13
    Last Post: 12-27-2006, 05:04 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •