Results 1 to 12 of 12

are o2's necessary if....

This is a discussion on are o2's necessary if.... within the External Engine forums, part of the LSx Technical Help Section category; if i have long tubes and no cats and no egr system.....would i need the o2's or not?...

  1. #1
    its short but its skinny. jiveass's Avatar
    Join Date
    Oct 2009
    Location
    The Woodlands/spring/houston
    Posts
    2,142

    pewter
    99 trans am

    are o2's necessary if....

    if i have long tubes and no cats and no egr system.....would i need the o2's or not?

  2. #2
    You've Seen The Butcher GoldenFlame's Avatar
    Join Date
    May 2009
    Location
    Indiana
    Posts
    335

    2009 Silverado Z71
    2003 Corvette MN6 Black

    You Need the front o2's that go into the Headers, but you won't need the rear ones

  3. #3
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    ^^ This. The front O2's control fueling in closed loop operation.

  4. #4
    its short but its skinny. jiveass's Avatar
    Join Date
    Oct 2009
    Location
    The Woodlands/spring/houston
    Posts
    2,142

    pewter
    99 trans am

    glad i asked this question....was gonna run without em cause the headers came with bolts that plug the o2 holes.....

  5. #5
    its short but its skinny. jiveass's Avatar
    Join Date
    Oct 2009
    Location
    The Woodlands/spring/houston
    Posts
    2,142

    pewter
    99 trans am

    will they need extensions? or no

  6. #6
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Unless you have the long harness sensors already, you'll either need extension harnesses or a new set of Bosch 13111 sensors.

  7. #7
    Impounded
    Join Date
    Apr 2010
    Location
    IN
    Posts
    2,148
    Quote Originally Posted by pajeff02 View Post
    Unless you have the long harness sensors already, you'll either need extension harnesses or a new set of Bosch 13111 sensors.
    this. some people have trouble with the extentions

  8. #8
    You've Seen The Butcher GoldenFlame's Avatar
    Join Date
    May 2009
    Location
    Indiana
    Posts
    335

    2009 Silverado Z71
    2003 Corvette MN6 Black

    I'd shell out for the Bosch o2's if your budget allows.. My buddy has extensions and his SES light is on all the time.. Car runs fine, but the code reads front o2's

  9. #9
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    Some people have issues with the extensions, but I have no idea as to the quality of extensions these people are running, or how they are routing them. I've seen some pretty hokey extensions that come with headers and you basically have to solder them together. That's just asking for problems.

    With that said, I've used a very nice set of 02 extensions on both of our 4th gens for years and never had a single issue. They are well made with GM style weather pack connectors and wiring insulation just as you would see on an 02 sensor.
    Honestly though, if the car hasn't had the 02's replaced in a while, I'd take Goldenflames advice and get a new set,,,while your at it just get the bosch 13111's with the longer harness and forget about the extensions. It eliminates the extra connections that are unecessary. Fewer connections means less possibility of problems if they should occur.

  10. #10
    Senior Member redbird555's Avatar
    Join Date
    Mar 2009
    Location
    pompano beach florida
    Age
    27
    Posts
    1,008
    2002 Camaro Z/28 Pewter

    Yup what he said^^ with the miles on the car you pcould probably use a new set anyway although some people have probs with the bosch sensors myself included. I did denso sensors they are the same price and are now oem on gm cars so why not? A few people have also been doing this its free and easy but i havent done it myself... Basically your switching the front pins with the rear ones on the pcm therefore you can simply plug in the front o2 sensors into the rear harnesses and they will work like you plugged them in up front.

    http://chevythunder.com/1999-2002%20...%20pinouts.htm

    "Take the 1 screw out of the blue connector, then use a small screwdriver to pop the grey cover off of it, and to pop the blue parts off as well, the releases for the grey cover are obvious when you look at it, you do NOT need to take the screw out of the connector to get the grey cover off, (you need to snip the small zip ties and re-do them later) and the blue pieces are held on by tabs on the ends...just put the ends in slightly (where white sticks through them) and they come right off...the pins then pull out towards the wire side when you pull the white lock tabs ever so slightly away from them. In that blue connector, swap the following pins:

    25 swaps with 26
    28 swaps with 29
    65 swaps with 66
    68 swaps with 69

    Thats IT...put the blue pieces back on, put the grey cover back on, replace those small zip ties, make sure the orange gasket is seated properly to keep water out of there, and bolt the connector back onto the PCM. Plug your front O2's in to the REAR connectors under your car...get brand new stock O2 sensors for your car and plug them right in.

    THE HARDEST part of the pin swap, is getting the grey cover off of the PCM connector...and with a small screwdriver or pick, that is a fairly easy task. Northern cars/trucks tend to show a little more corrossion on the metal body of the plug which makes it harder to get the cover off...but with patience (and 3 minutes) it comes off." from ls1tech

  11. #11
    King 0f n00bz shady milkman's Avatar
    Join Date
    Jan 2006
    Location
    Shepherd, Michigan
    Age
    29
    Posts
    11,775

    blacker than wesleysnipes
    98' trans am

    grab some 13111..

  12. #12
    dbl clutch'n like i shld WICKEDLS1's Avatar
    Join Date
    Aug 2010
    Location
    Oklahoma City, Oklahoma
    Posts
    1,807

    sebring silver
    Y2K SS CAMARO

    the only way you could get away with deleting them is with a speed density tune but you would also have to get rid of the MAF too

    its alot cheaper to buy the o2's then have it tuned like stated above

Thread Information

Users Browsing this Thread

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

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
  •