Author Bad gas - flash ecu  (Read 1319 times)

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  • Offline AdzventureXR   kr

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    Bad gas - flash ecu
    on: May 07, 2022, 03:42:01 pm
    May 07, 2022, 03:42:01 pm
    Well, filled tank with what I thought was premium fuel. Trailered bike to a good mountain range and bike ran like it was on 3 cylinders after 5k rpm. Power went flat like on the rev limiter. Dumped some octane boost and cleared up some of mis fire. Today had almost empty tank and put fresh fuel. Same issue.

    I went to the dealer and they ran diagnostic on fuel and ignition. No issues. Walked out with new plugs to try at home

    Bike is not stock. Brentuning, IAT re location.

    Any thoughts.



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  • Offline Antares   gb

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    Re: Bad gas - flash ecu
    Reply #1 on: May 07, 2022, 08:03:25 pm
    May 07, 2022, 08:03:25 pm
    *Originally Posted by AdzventureXR [+]
    Well, filled tank with what I thought was premium fuel. Trailered bike to a good mountain range and bike ran like it was on 3 cylinders after 5k rpm. Power went flat like on the rev limiter. Dumped some octane boost and cleared up some of mis fire. Today had almost empty tank and put fresh fuel. Same issue.

    I went to the dealer and they ran diagnostic on fuel and ignition. No issues. Walked out with new plugs to try at home

    Bike is not stock. Brentuning, IAT re location.

    Any thoughts.

    Have you tried resetting mixture preparation and knock control in the adaptations? If that doesn't help i'd look into checking your injectors and plugs. Lots of diagnostic functions to help with that including test firing both sets of injectors.

  • Offline Winger   gb

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    Re: Bad gas - flash ecu
    Reply #2 on: May 07, 2022, 08:47:59 pm
    May 07, 2022, 08:47:59 pm
    *Originally Posted by AdzventureXR [+]
    Well, filled tank with what I thought was premium fuel. Trailered bike to a good mountain range and bike ran like it was on 3 cylinders after 5k rpm. Power went flat like on the rev limiter. Dumped some octane boost and cleared up some of mis fire. Today had almost empty tank and put fresh fuel. Same issue.

    I went to the dealer and they ran diagnostic on fuel and ignition. No issues. Walked out with new plugs to try at home

    Bike is not stock. Brentuning, IAT re location.

    Any thoughts.

    How long has the Brentune been in the bike and has it been running OK until today.

    What made you go for the Bretune option in the first place,I’ve only ever ventured away a Power Commander once with the bikes I currently own and it was/has been a mistake...not a big one but my Rexxer map in my K Sport ain’t no PC, and no matter what you go with it HAS to go on a dyno, cuz all bikes are different even if they have the same spec which most do not.

    While most folk like to quote HP figures with their add on’s, but the tell tale one is how level air/fuel mix is.

  • Offline Antares   gb

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    Re: Bad gas - flash ecu
    Reply #3 on: May 07, 2022, 08:50:05 pm
    May 07, 2022, 08:50:05 pm
    If it was fine up till now it's unlikely the tune is at fault. That said with brentune you can always return stock map to give it a try if it makes a difference.

  • Offline Winger   gb

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    Re: Bad gas - flash ecu
    Reply #4 on: May 07, 2022, 08:52:35 pm
    May 07, 2022, 08:52:35 pm
    *Originally Posted by Antares [+]
    If it was fine up till now it's unlikely the tune is at fault. That said with brentune you can always return stock map to give it a try if it makes a difference.

    What aftermarket fuelling device do you run on yours then?

  • Offline Antares   gb

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    Re: Bad gas - flash ecu
    Reply #5 on: May 07, 2022, 08:58:31 pm
    May 07, 2022, 08:58:31 pm
    *Originally Posted by Winger [+]
    What aftermarket fuelling device do you run on yours then?

    None at the moment, they all do the same thing in different ways. For reference ran my ER6 on exhaust and filter for 30k miles + whatever the previous owner had with 0 ill effects apart from slightly sub optimal smoothness (nothing terrible though) The XR has had an exhaust for a while now too without touching the fuelling and it's still running rich slightly rich up top, on stock ECU, that said throttle response could definitely use an improvement and so I will take it to get ECU flashed on a dyno, neither of these would cause knock or poor ignition unless the numbers are awfully wrong which unless there is a faulty component or mechanical reason is unlikely to develop one day to the other.

  • Offline Winger   gb

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    Re: Bad gas - flash ecu
    Reply #6 on: May 07, 2022, 09:16:56 pm
    May 07, 2022, 09:16:56 pm
    *Originally Posted by Antares [+]
    None at the moment, they all do the same thing in different ways.

    You wrong and if you try more than one system you’ll find that out.

    You’ll note the OP mentions IAT.....


  • Offline Antares   gb

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    Re: Bad gas - flash ecu
    Reply #7 on: May 07, 2022, 09:21:53 pm
    May 07, 2022, 09:21:53 pm
    *Originally Posted by Winger [+]
    You wrong and if you try more than one system you’ll find that out.

    You’ll note the OP mentions IAT.....

    Sure. Unless you change your injectors it doesn't matter if it's your ECU telling them to inject for 2.5ms and open the butterfly valves 70% or your power commander, or your Rapid bike EVO, or your Brentune, or your no brand name "FUEL BOOSTER"... They all do the same thing. The only difference is what happens between the injector and butterfly valves and the throttle, the input and output are the same.
    Yes... Inlet air temperature relocation... All it does is when the bike is standing still the correct air temperature is still read...

    Anyway all of this is off topic, as I mentioned before, the steps I'd take to find out the culprit:

    1: Reset "Mixture preparation" and "Knock control" in the engine electronics adaptations using a GS 911 or Motoscan
    2: Undo the brentune flash if 1 doesn't help. Brentune can modify ignition timings which can cause knock but the ECU can still compensate, but try it anyway, maybe you reached the limit of compensation.
    3: If issue is still there, take of tank fairing and remove injector rails and test them using GS 911 or Motoscan
    4: If issue is still not found, take off the airbox and investigate coils/sparkplugs.

    Also actually you might be better off with non premium fuel, often Non-ethanol fuels are higher octane in general but ethanol actually increases the octane rating, although I'm not sure if that's factored into the rating actually displayed on the pump.
    Last Edit: May 07, 2022, 09:35:48 pm by Antares

  • Offline Winger   gb

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    Re: Bad gas - flash ecu
    Reply #8 on: May 07, 2022, 09:53:38 pm
    May 07, 2022, 09:53:38 pm
    If the dealer has checked the bike out and they say it’s ok, fit a PC and take the bike to a dyno.

  • Online Mareng1   gb

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    Re: Bad gas - flash ecu
    Reply #9 on: May 08, 2022, 03:20:19 am
    May 08, 2022, 03:20:19 am
    Is there any chance that the exhaust flap valve is sticking partially shut?