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O2 Replacement

This is a discussion on O2 Replacement within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by 0rion that's a tough call really. I don't think there would be enough residue in there to ...

  1. #21
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by 0rion View Post
    that's a tough call really. I don't think there would be enough residue in there to harm anything. If you wanted to be certain use your old ones since changing them really is just a couple of minutes. I probably would just put the new ones in there and call it a day but that's me.
    I agree here. I've installed headers on both of our 4th gens and just installed the new 02's and let it fly. Never had any problems with either car.

  2. #22
    Senior Member JaycenK's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    I agree here. I've installed headers on both of our 4th gens and just installed the new 02's and let it fly. Never had any problems with either car.
    me 2 no codes no problems after lt headers and they are bosch as well.

  3. #23
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    The headers are in and I installed my new Bosch 13111 O2 sensors this evening. You guys weren't kidding when you said it came with a longer wire harness... holy moly!

    The passenger side looks like a simple run. If I zip tie the harness to the transmission cooler lines it'll stay away from the exhaust and tuck up nicely under the car. The driver side looks like more of a challenge. There isn't anything to attach it to along the oil pan to keep it secure. What's the best routing on this side?

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    Junior Member jmro's Avatar
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    I am not sure if there is a best routing lol. When I put mine in I think I had to make a big loop with a zip tie and then use a smaller one to actually hold it away from the header. It might be a little ghetto but man it works

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    My extra is tied together and then ran between the oil filter and pan. Stays tucked in there nicely, away from the exhaust, and the heat off the pan isn't enough to damage the wiring.

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    I thought about running behind the filter, but after looking it over again I decided to take advantage of the extra long harness of the 13111's. I installed two cable clamps off the front of my tranmission using the pan bolts to anchor them. I spaced the clamp off the pan with two washers so as not to bend it. I then ran the harness for the driver side O2 across the front of the pan and up the transmission cooler lines along side the passenger O2 harness. At the oil pan kick up for the K-member, the harness runs back across to the connector. The harness was the perfect length for this run.



  7. #27
    Moderator 35th-ANV-SS's Avatar
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    PS - Those Kooks look sexy...

  8. #28
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    Quote Originally Posted by 35th-ANV-SS View Post
    PS - Those Kooks look sexy...

    Yes they do! I worked on the catted-Y tonight and am not sure I like how it is fitting. Seems too tight to the underbody and actually touches the brake lines in the tunnel. I can pull it down, but do not want to put too much pressure on it. By chance did you change out your motor mounts when you installed your headers? I am thinking that new mounts would sit higher and tip the back of the engine down -- moving the pipes away from the body. Need some input on this one from those that have done it.

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    Veteran Hi-Po's Avatar
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    Run mine around the oil filter, seems to be doing fine.

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    Quote Originally Posted by pajeff02 View Post
    Yes they do! I worked on the catted-Y tonight and am not sure I like how it is fitting. Seems too tight to the underbody and actually touches the brake lines in the tunnel. I can pull it down, but do not want to put too much pressure on it. By chance did you change out your motor mounts when you installed your headers? I am thinking that new mounts would sit higher and tip the back of the engine down -- moving the pipes away from the body. Need some input on this one from those that have done it.
    I can't comment on that as I didn't change my motor mounts. I'm sure someone will chime in though.

  11. #31
    Yeah baby! Yeah! silverWS6's Avatar
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    Hey Jeff by any chance did you start the car with open headers?

    I started mine and damn she sounded like a beast, I went to a little store to show off to my friends and a guy in a cammed ss (he said it was cammed) came and asked what i had in it, i said "mmmmm open headers!" My dad said he heard me all the way to the store and thats about a mile away from home at least, needless to say i want cutouts on both my girls now

  12. #32
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    Quote Originally Posted by silverWS.6 View Post
    Hey Jeff by any chance did you start the car with open headers?

    I started mine and damn she sounded like a beast, I went to a little store to show off to my friends and a guy in a cammed ss (he said it was cammed) came and asked what i had in it, i said "mmmmm open headers!" My dad said he heard me all the way to the store and thats about a mile away from home at least, needless to say i want cutouts on both my girls now

    My PCM is on its way back from Frost right now so the car will not even run yet. I probably will not start it like that as once it warms up and goes into closed loop the feedback from the O2's is not going to be accurate -- the sensors are right at the end of the headers and might cause it to go pig rich.

  13. #33
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by pajeff02 View Post
    My PCM is on its way back from Frost right now so the car will not even run yet. I probably will not start it like that as once it warms up and goes into closed loop the feedback from the O2's is not going to be accurate -- the sensors are right at the end of the headers and might cause it to go pig rich.
    you can borrow my pcm till morning

  14. #34
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    Quote Originally Posted by mark21742 View Post
    you can borrow my pcm till morning

    Looks like you are going to be snowed in... again. Mine should be back long before you dig out, but thanks for the offer.

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    Veteran 0rion's Avatar
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    another option for running that drivers side is up behind the heat shield on the firewall. I drilled a couple little holes in that heat shield and ran it up behind that and used the holes to put zip ties through.

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    Quote Originally Posted by 0rion View Post
    another option for running that drivers side is up behind the heat shield on the firewall. I drilled a couple little holes in that heat shield and ran it up behind that and used the holes to put zip ties through.

    I never thought about going up the firewall. I did consider going behind the heatshield that protects the fuel and brake lines, but nixed that in favor of crossing it over when I found that I had just enough wire length to make it.

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by pajeff02 View Post
    Looks like you are going to be snowed in... again. Mine should be back long before you dig out, but thanks for the offer.
    Yeah and work wanted me to pickup a Staples load tonight with 4 stop up around Clifton NJ in the morning... I said NO lol

    But it gives me more time to work on the car

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    Senior Member Too Fast's Avatar
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    You Gotsta Fire that thing up open headers. You just must. If you don't, I will track you down and bitch slap ya!

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    Quote Originally Posted by pajeff02 View Post
    Click for full size
    Dang you do nice work!! I like the wire routing

  20. #40
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    Quote Originally Posted by Too Fast View Post
    You Gotsta Fire that thing up open headers. You just must. If you don't, I will track you down and bitch slap ya!

    Not going to happen.


    Quote Originally Posted by Cutlass View Post
    Dang you do nice work!! I like the wire routing

    Thanks! Still trying to figure out my Y-pipe clearance. It just seems too tight to the underbody on the driver side and actually touches the brake lines in the tunnel. Looks like this right now:












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