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Thread: Help me, Delete O2 sensors

  1. #1
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    Help me, Delete O2 sensors

    Hello everyone, I just acquired my vcm suite, I want to remove my O2 sensors 2001 Chevrolet Silverado 5.3, I need your help to know that I delete or remove parameters.

    No more nothing to ask, I would greatly appreciate your help

  2. #2
    Senior Tuner mowton's Avatar
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    Change all DTC's that reference O2 sensor 2 to "3 - no error report" and uncheck ses.

    Engine>Engine Diagnostic>DTC

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

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  3. #3
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    Quote Originally Posted by mowton View Post
    Change all DTC's that reference O2 sensor 2 to "3 - no error report" and uncheck ses.

    Engine>Engine Diagnostic>DTC

    Ed M
    If I turn off all the O2 sensor DTC, that way it would work the engine?

  4. #4
    Senior Tuner mowton's Avatar
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    Quote Originally Posted by Eli R. Morales View Post
    If I turn off all the O2 sensor DTC, that way it would work the engine?
    I didnt say all, I said all the ones marked Sensor 2. Sensor 1 are your primary O2's (control the closed loop fueling) and Senspr 2 are your secondary O2's which are only used to test the CATS are working.

    Also, you can turn off all the DTC's and the O2's will still work, you just wont know when the various diagnostics fail to alert you of a problem.

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

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  5. #5
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    Quote Originally Posted by mowton View Post
    I didnt say all, I said all the ones marked Sensor 2. Sensor 1 are your primary O2's (control the closed loop fueling) and Senspr 2 are your secondary O2's which are only used to test the CATS are working.

    Also, you can turn off all the DTC's and the O2's will still work, you just wont know when the various diagnostics fail to alert you of a problem.

    Ed M
    Thanks for explaining that part and I understand what you mean, but I want to work the engine in a way that O2 does not work, something like the open loop, or either work with the engine in open loop

  6. #6
    Advanced Tuner Road's Avatar
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    Unplug the o2 sensors you don't want then delete any codes that set

  7. #7
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    Quote Originally Posted by Eli R. Morales View Post
    Thanks for explaining that part and I understand what you mean, but I want to work the engine in a way that O2 does not work, something like the open loop, or either work with the engine in open loop
    Set the closed loop enable temp higher than the engine will ever run at. I would say set it at 284 F but since you are from Venezuela, you may be working with C instead of F.

  8. #8
    Senior Tuner mowton's Avatar
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    Actually that is my bad, I read your wanted to remove the rear O2's, dont ask me where I git that from because when I went back and saw the answers I went ahhhhhh? :-)

    It seems the real question is you want to run in open loop....you can leave the O2's physically in or remove them (plug the bungs) at which you could disable both sensor 1 and sensor 2 DTC's in their entirety and as 2xLS1 said, set the closed loop enable to the highest temp allowed. I also disable the lt and st trim enables just for belts and suspenders. Before you start tuning, using the VCM, reset the fuel trims several times.

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

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  9. #9
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    Quote Originally Posted by mowton View Post
    Actually that is my bad, I read your wanted to remove the rear O2's, dont ask me where I git that from because when I went back and saw the answers I went ahhhhhh? :-)

    It seems the real question is you want to run in open loop....you can leave the O2's physically in or remove them (plug the bungs) at which you could disable both sensor 1 and sensor 2 DTC's in their entirety and as 2xLS1 said, set the closed loop enable to the highest temp allowed. I also disable the lt and st trim enables just for belts and suspenders. Before you start tuning, using the VCM, reset the fuel trims several times.

    Ed M
    Today I did a test, turn on the closed top of the temperature loop, and also disable st and lt, but after that flashed I had a very bad result, to tell them that the truck was not moving anything in speed, was dead

    the only thing I did was unplug the O2 sensors and disable the codes, but at no time that drove not lit it any DTC's.

    That may be happening?

  10. #10
    Senior Tuner mowton's Avatar
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    Post your tune and log please.

    Not sure of your mods, please post them as well.

    Remember, now you don't have the O2's telling the PCM whether to add or take away fuel to maintain commanded AFR so if the mods/tune combo are off, it may not run very well untill you correct any fueling to make it run.

    As a quick question, why do you want to run without O2 sensors?


    Thanks,
    Last edited by mowton; 03-21-2015 at 06:59 AM.
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

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  11. #11
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    Quote Originally Posted by mowton View Post
    Post your tune and log please.

    Not sure of your mods, please post them as well.

    Remember, now you don't have the O2's telling the PCM whether to add or take away fuel to maintain commanded AFR so if the mods/tune combo are off, it may not run very well untill you correct any fueling to make it run.

    As a quick question, why do you want to run without O2 sensors?


    Thanks,
    Today I'll try and keeps the tune and log, to publish it and see what the problem is, and heard people here who say there parameters that are connected with each other and now you tell me your on the values of fuel I see that it is so .

    I notrato only run without O2 sensors, if not also for the engine to operate at all times, because I want this? Here in Venezuela we are experiencing a high economic crisis because the damn government of shit we have, whether it is a dictatorship that we have, and spare parts for vehicles are too expensive and scarce, I can not buy sensors O2 and having already are defective

  12. #12
    Senior Tuner mowton's Avatar
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    Quote Originally Posted by Eli R. Morales View Post
    Today I'll try and keeps the tune and log, to publish it and see what the problem is, and heard people here who say there parameters that are connected with each other and now you tell me your on the values of fuel I see that it is so .
    Is it a stock truck?

    Also, understanding the language difference, can you re-iterate what is in bold for me please.

    Thank you,

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

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  13. #13
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    Quote Originally Posted by mowton View Post
    Is it a stock truck?

    Also, understanding the language difference, can you re-iterate what is in bold for me please.

    Thank you,

    Ed M
    The truck is totally stock, sorry if sometimes do not understand the problem esq not much English and I write by google translator to take it to English, but sometimes the translator does not translate well.

    what I mean is, I hear that when you modify some parameters sometimes have to modify other because there are parameters that can be connected together, you you made me refer to something, because I you you said that if you disabled the close loop would have to modify the AFR parameters

  14. #14
    Senior Tuner mowton's Avatar
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    Got it, also make sure you est the fuel trims via the VCM feature.

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

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  15. #15
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    Quote Originally Posted by mowton View Post
    Got it, also make sure you est the fuel trims via the VCM feature.

    Ed M
    in such a case that fuel parameters would have to increase?

  16. #16
    Senior Tuner mowton's Avatar
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    I meant to say reset your trims and then you will need a wideband. So the best to do is read the old trims and adjust accordingly. When I get home I'll help with this..

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

    ERM Performance Tuning -- Interactive Learning ..from tuning software training to custom tunes
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  17. #17
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    Quote Originally Posted by mowton View Post
    I meant to say reset your trims and then you will need a wideband. So the best to do is read the old trims and adjust accordingly. When I get home I'll help with this..

    Ed M
    Thanks for your help friend, it would be annoying if you give me a contact drecto yours? If you do not want to make public send it to my e-mail [email protected]

    Thanks,