Author O2 sensor specific question.....  (Read 384 times)

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  • Offline 3alfa3   hr

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    Offline 3alfa3

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    O2 sensor specific question.....
    on: Sep 23, 2022, 01.58 pm
    Sep 23, 2022, 01.58 pm
    Does someone knows for fact if O2 sensor is "active" or "inactive" when riding in 1st gear?

    Does ECU use O2 sensor informations through all gears (1-6) and only RPMs are relevant or it could be that ECU ignores O2 sensor when riding in 1st gear?

    Im having problem between 2000-3000 RPMS (hesitation, jerking, loss of Power) when bike is warm through all gears (2nd most prominent) EXCEPT in 1st gear - no problem at all when in 1st gear in those RPM range.

    Idle is perfect, no problem there. New Spark plugs, air filter, cleaned (and synced) throttle bodies.

    52.000kms, O2 sensor is thermally stressed, so i suspect it could be "worn" and out of specs, but not enough for Check Engine Light.

    No service codes....

    Tnx
    Last Edit: Sep 23, 2022, 02.35 pm by 3alfa3

  • Offline Cazzy_R   england

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    Offline Cazzy_R

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    Re: O2 sensor specific question.....
    Reply #1 on: Sep 23, 2022, 04.04 pm
    Sep 23, 2022, 04.04 pm
    *Originally Posted by 3alfa3 [+]
    Does someone knows for fact if O2 sensor is "active" or "inactive" when riding in 1st gear?

    Does ECU use O2 sensor informations through all gears (1-6) and only RPMs are relevant or it could be that ECU ignores O2 sensor when riding in 1st gear?


     Fitting an O2 eliminator would prove or disprove your theory.



    https://smartmoto-electronics.com/oxygen-sensor-eliminator?moto_brand_id=11&moto_model_id=92&moto_year=2020
     


  • Offline 3alfa3   hr

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    Offline 3alfa3

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    Re: O2 sensor specific question.....
    Reply #2 on: Sep 23, 2022, 04.30 pm
    Sep 23, 2022, 04.30 pm
    But, what with check engine light? My Z is 2020 model (EU version, same as UK for that matter).Does it work on that model?

    Also, i have OEM headers with catalytic converter, would not using O2 sensor clogged it eventually, i ride 20.000km per season and rather invest in new O2 sensor if necessary?


    For test - sure, but, would like more to have definitive answer if O2 sensor is used when riding in 1st gear. If yes - its not fault O2 sensor.
    Last Edit: Sep 23, 2022, 04.34 pm by 3alfa3

  • Offline Cazzy_R   england

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    Offline Cazzy_R

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    Re: O2 sensor specific question.....
    Reply #3 on: Sep 23, 2022, 05.18 pm
    Sep 23, 2022, 05.18 pm
    *Originally Posted by 3alfa3 [+]
    But, what with check engine light? My Z is 2020 model (EU version, same as UK for that matter).Does it work on that model?

    Also, i have OEM headers with catalytic converter, would not using O2 sensor clogged it eventually, i ride 20.000km per season and rather invest in new O2 sensor if necessary?


    For test - sure, but, would like more to have definitive answer if O2 sensor is used when riding in 1st gear. If yes - its not fault O2 sensor.

     You probably know all this:

     Normally when the bike is running in the closed loop portion of the map (sub 5000 revs and low throttle openings) the O2 sensor will send signals to the ECU to lean out the fuelling to achieve the emission test standard.
     Above 5000 revs and at wider throttle openings the bike is running open loop. i.e. no o2 sensor feedback.
     With o2 eliminator installed the bike will run on the fixed map from the ECU and no leaning out will take place which is exactly what you suspect is currently happening in first gear.
     According to the description is supposed to prevent CEL occurring.
     As regards the cat getting blocked I doubt it. Our o2 sensor is a narrow band type so can only make small adjustments so the default fuelling will still be the lean side low down and nothing is any different than stock in the upper ranges. Also AIS is still functioning.

     Just an idea to try it.  :821:
     

  • Offline mininsx   us

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    Offline mininsx

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    Re: O2 sensor specific question.....
    Reply #4 on: Sep 23, 2022, 10.09 pm
    Sep 23, 2022, 10.09 pm
    I had a 2013 Honda  CB1100 a few years ago and it surged at certain RPM in any gear with steady throttle. It drove me nuts. I finally couldn't take it anymore and I bought an O2 eliminator from ebay, installed it in about five minutes and my surging magically disappeared! They work and don't throw a code.

  • Offline 3alfa3   hr

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    Offline 3alfa3

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    Re: O2 sensor specific question.....
    Reply #5 on: Sep 25, 2022, 02.25 pm
    Sep 25, 2022, 02.25 pm
    After intense google search, did not found that 1st gear is excluded from O2 sensor when it comes to controlling fuel mixture at low RPMs. Not only for Z900, but generally.

    That silky smooth 1st gear throughout all revs is confusing, i almost wants it to be problematic as other gears so detection of the problem would be easier.

     



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