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rear o2's = long term fuel trim?

This is a discussion on rear o2's = long term fuel trim? within the General Help forums, part of the LSx Technical Help Section category; I removed the rear o2's when I installed my headers, and I was planning on getting them tuned out. But ...

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    Senior Member M-Ten's Avatar
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    rear o2's = long term fuel trim?

    I removed the rear o2's when I installed my headers, and I was planning on getting them tuned out. But I was just told that I needed the rear o2's because they regulated my long term fuel trim and helped the car adjust itself.. And that if I took them out and changed climates or altitude the car would not run properly and would sputter and act funny.

    Is this true?

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    Dunno for sure, I always thought they just monitored the cats????

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    Senior Member M-Ten's Avatar
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    anybody know?

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    I just installed headers and not having the rears made the fuel mixture bout 11 to 1. Just had them tuned out and the fuel curve adjusted and everything is fine. I believe for the most part they are there just to monitor the cats.

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    Senior Member M-Ten's Avatar
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    then why is he telling me to get a bung installed on the headers and put them back in? he keeps telling me that they regluate the long term fuel trim and help the car adjust itself.. if that's not true, then what would they be reading in the cats?

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    Quote Originally Posted by M-Ten View Post
    then why is he telling me to get a bung installed on the headers and put them back in? he keeps telling me that they regluate the long term fuel trim and help the car adjust itself.. if that's not true, then what would they be reading in the cats?
    Rear o2's determine wther the cats are working.

    Do you have the rear o2's plugged in and the codes turned off?

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    Senior Member mrr23's Avatar
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    rear o2s only verify if the cats are within parameters. if the front and rear o2 numbers are too close together, the PCM will add fuel to try and see if the front o2 numbers go up and the rears stay lower.

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    he's talkin about the front o2's if he says something about putting a bung on the headder, cuz he rears would go in the piping

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    bung holeio

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    Senior Member M-Ten's Avatar
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    thanks lethal, you always give me good advice lol..

    Ok so the rear ones only monitor the cats? I don't need them if I don't have cats, right?

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    Member 180ls1's Avatar
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    ya you need them tuned out. i hate when people know more then you but you know they are wrong in one aspect and you know they are wrong but cant do much about it.

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    Senior Member M-Ten's Avatar
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    haha exactly how i feel.. my friend is a genius when it comes to his car, his corvette.. fastest car i've ever seen... but there is a FEW things that I know when it comes to my car..

    I mean we have similar cars but there are some differences, and every once in a while I will be able to prove him wrong, solely from what i learn on here

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    Member 180ls1's Avatar
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    Quote Originally Posted by M-Ten View Post
    haha exactly how i feel.. my friend is a genius when it comes to his car, his corvette.. fastest car i've ever seen... but there is a FEW things that I know when it comes to my car..

    I mean we have similar cars but there are some differences, and every once in a while I will be able to prove him wrong, solely from what i learn on here
    i am glad you could understand what i wrote i almost could not. haha but never piss someone off that is working on your car by telling him he is wrong straight up.

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    Senior Member M-Ten's Avatar
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    Lol yeah I understood, probably cuz i was thinking/feeling the same way.

    And yeah you have to kind of.. umm... suggest it first, see what he says, then say.. welllll.. i was talking to some guys and they told me...

    that's the way i always do it lol

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    Veteran 0rion's Avatar
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    that's the number one reason you should get a couple of books and buy a good set of tools. There's really nothing on these cars you can't learn. There's some lessons learned the hard way such as breaking the oil sensor removing the intake or having the rear twist as you're dropping it and almost dragging the front off of the ramps but there's really nothing on these cars you can't learn. It's also nice having this site here so you can ask questions. I remember when I first bought my car I was looking around the city for someone to do headers for me because there was no way in hell I could do it......fast forward a few years later and I've had 90% of that car tore apart including heads/cam. Just have to dive in and it helps if you have a daily driver so you don't have to worry about getting to work for a few days.

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    Senior Member M-Ten's Avatar
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    Yeah I know what you mean.. I'm learning a lot having this car, it's my second car and I've only been driving for around a year now, so there's still a lot to learn.. I pick up on things pretty quick though, and I always just like to double check what people say before I do something, especially if it involves me spending money lol.. Which is why I asked

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    J/K hahahaha

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    Senior Member M-Ten's Avatar
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    !! i work hard

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    At what????? Bungholio hahaha I have been laughing ever since you said bung hole earlier hahahahaha!

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    Senior Member M-Ten's Avatar
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    lol did i really say bung hole?? and i guess i didn't realize what the whole bungholeio thing was about.. now i get lol

    i work on computers.. building/repairing/selling them.. things like that

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