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rear o2 delete?

This is a discussion on rear o2 delete? within the Computer & Tuning forums, part of the LSx Technical Help Section category; silly question but ive heard this phrase thrown around here a couple times and never really understood wat the benefit ...

  1. #1
    Member slpdablueZ28's Avatar
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    rear o2 delete?

    silly question but ive heard this phrase thrown around here a couple times and never really understood wat the benefit is in deleting the rear o2 sensor, should i do it during my tune, and will my car pass inspection?

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    Yea, the car will pass inspection. Only real reason is if you get rid of the cats. Only way they would know if you got rid of the cats would be if they hooked it up to a sniffer. The reason to delete the o2s is if you don't, and get rid of the cats, it will throw a code, and the OBDII will tell them the cats are bad or they aren't there, so then they'll hook it up to a sniffer. Then you won't pass. But 96 up I believe, they don't hook it up to the sniffer since OBDII will tell them of any problems.

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    Member slpdablueZ28's Avatar
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    well i dont think im going to be getting rid of the cats cause this is basically my everyday car. but in general any benefit if i did it or just not even bother with it because im keeping the cats on anyway

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    I wouldn't bother really. I don't see any reason to keep the cats just cause its your daily driver. Thats practically 20hp for free...

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    Member slpdablueZ28's Avatar
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    its so tempting, maybe an electric cutout would help in the future?

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    Quote Originally Posted by slpdablueZ28 View Post
    its so tempting, maybe an electric cutout would help in the future?
    Yea, but I'd just get rid of the cats. I'd get rid of them either way to be honest. That was you got power all the time, but when you want that little extra and to be extra loud, you can.

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    i f*****g hate rice adam0321's Avatar
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    i dont have any cats and i have cutouts.. hear in florida its not a problem they dont even have inspection down hear. but when I go back to north carolina they are tough, sniifer visual, and obd2 inspection...got to figure out a way to keep my car registered down hear..

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    Member slpdablueZ28's Avatar
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    yea well i need to pass nys inspection, plus cant be too loud in bk at night. already a cop magnet

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    Member slpdablueZ28's Avatar
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    by the way them being hig flow cats does that make any difference?

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by slpdablueZ28 View Post
    by the way them being hig flow cats does that make any difference?
    the only reason to get the hiflow cats is to pass a visual inspection...flow better than regular cats, but not as good as strait pipe. if you go with hiflow cats I'd get the rear o2's deleted because it can still throw the (low catalyst) code.
    magnaflow hiflow universal cats run $65 each through summit racing catalog

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    Member slpdablueZ28's Avatar
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    Quote Originally Posted by mark21742 View Post
    the only reason to get the hiflow cats is to pass a visual inspection...flow better than regular cats, but not as good as strait pipe. if you go with hiflow cats I'd get the rear o2's deleted because it can still throw the (low catalyst) code.
    magnaflow hiflow universal cats run $65 each through summit racing catalog
    well yeah i got the high flow cats from slp when i got my headers. so rear delete recommended? my car does throw lean air mix codes every once in a while but i dont think its been affecting anything

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    Quote Originally Posted by slpdablueZ28 View Post
    well yeah i got the high flow cats from slp when i got my headers. so rear delete recommended? my car does throw lean air mix codes every once in a while but i dont think its been affecting anything
    Have you done anything to the MAF? If so, that could be why its throwing the lean codes. SLP MAFs are known to do that.

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    Member slpdablueZ28's Avatar
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    yeah i got the 85mm
    2002 z28-slp cai, slp loudmouth, slp tuned headers, slp 85 mm MAF, slp high flow cats, 3" y-pipe and collectors
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    Quote Originally Posted by slpdablueZ28 View Post
    yeah i got the 85mm
    Then theres where your lean codes are coming from.

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    Member slpdablueZ28's Avatar
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    well im getting it tuned and a diablo programmer for it so does that solve my problem?

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    Eh, I dunno. I guess it would depend on your tuner. The Diablo won't help I don't think. I wouldn't waste money on it if your getting a tune anyway...

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    Junior Member spydaloc's Avatar
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    Vengeance Racing VRX2 cammed 2001 LS1 5.3L, blowing black smoke out of the tailpipes, plugs are clean. Wideband says the fuel is 13.5 - 14.2 at idle, yet the computer says it is lean and keeps adding fuel, long term fuel trim is 25%, short term is 3%. Idle is very up and down. Will not idle. Give it gas and it goes. Exhaust is Sanderson shorties, with no cats, Spintech XL mufflers, 2.5" exhaust pipes. Vehicle idles very high in drive, and while driving it runs fast while in drive. Any help will be much appreciated. Thanks alot fellas!

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    Quote Originally Posted by spydaloc View Post
    Vengeance Racing VRX2 cammed 2001 LS1 5.3L, blowing black smoke out of the tailpipes, plugs are clean. Wideband says the fuel is 13.5 - 14.2 at idle, yet the computer says it is lean and keeps adding fuel, long term fuel trim is 25%, short term is 3%. Idle is very up and down. Will not idle. Give it gas and it goes. Exhaust is Sanderson shorties, with no cats, Spintech XL mufflers, 2.5" exhaust pipes. Vehicle idles very high in drive, and while driving it runs fast while in drive. Any help will be much appreciated. Thanks alot fellas!
    You pretty much nailed it...Its too lean, and idles to high (cause of being lean most likely). Did you get a tune after the cam? If not, you need to, and if you did, I've give that tuner a ass whoopin.

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    How can you remove your o2 sensor? Ive never heard of just geting rid of the o2 sensors.

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    Quote Originally Posted by Black 98 formula ws6 View Post
    How can you remove your o2 sensor? Ive never heard of just geting rid of the o2 sensors.
    Only the rear o2s. They only thing they do is tell if the cats are doing there job. No cats = no rear o2s. Just gotta have the codes removed from the computer so you don't get a SES light and can pass inspection. (not visual or sniffer, only OBDII, but thats all they usually do unless they get a code)

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