Triumph 2003 955i Cutting Out When Throttle Blipped.

Discussion in 'Technical Help' started by merc85, Dec 22, 2020.

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  1. Tricky-Dicky

    Tricky-Dicky Crème de la Crème

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    #41 Tricky-Dicky, Jan 8, 2021
    If TPS is reporting the wrong resistance/voltage when the throttle is closed then this will cause problems ...it's a common problem with cars as linkages develop play, or it just goes out of adjustment.
    Does tune ecu not report the actual value?
     
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  2. merc85

    merc85 Well-Known Member

    Sep 2, 2020
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    #42 merc85, Jan 8, 2021
    Sorry found it, It reads

    Throttle voltage bike switch off, ignition on
    0.2 /0.59v

    Idle reads -7
    IACV -7

    When the throttle on the bike is WOT it read 67%

    Does any of the above sound correct?
     
  3. Tricky-Dicky

    Tricky-Dicky Crème de la Crème

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    #43 Tricky-Dicky, Jan 8, 2021
    Sorry couldn't tell you without a manual you will need the tolerance figures to set correctly there will probably be a set figure that it should register with ignition on and throttle closed and a figure for WOT, the important one will be the closed figure as without the correct voltage the injectors will still be firing so over fuel and surge.
     
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  4. merc85

    merc85 Well-Known Member

    Sep 2, 2020
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    #44 merc85, Jan 8, 2021
    the important one will be the closed figure as without the correct voltage the injectors will still be firing so over fuel and surge.

    And this buddy is whats happening,

    hummmm
     
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  5. merc85

    merc85 Well-Known Member

    Sep 2, 2020
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    #45 merc85, Jan 9, 2021
    Well it would apear that the throttle is a percentage of the voltage and its correct.

    So im not sure about the IACV being -7 ?

    Anyone any more ideas? Has anyone conveted a 955i to carburetors before? Junking th FI is something id love todo at this point.
     
  6. Sprinter

    Sprinter Kinigit

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    #46 Sprinter, Jan 9, 2021

    Keep going mate you are slowly narrowing it down.
     
  7. Mike in it

    Mike in it Member

    Nov 30, 2020
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    #47 Mike in it, Jan 10, 2021
    I dont know if this helps.......my new to me 955i speed triple wouldn't start , it cranks like it should but wouldn't fire , bike workshop checked it over and replaced plugs ......But even though it now starts ok the bike shop recommends it being remapped , told me its common on the older fuel injected Triumphs ?
    Apparently they overfuel? What I'm getting at , does yours need remapping ?
     
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  8. merc85

    merc85 Well-Known Member

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    #48 merc85, Jan 10, 2021
    Thankyou buddy,

    She has been remapped, It runs slightly worse in standard form.

    The BIke tbh Starts on the button even in minus temp's, Other than the cutting out when blipping the throttle it runs really well which is why its so annoying.
     
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  9. merc85

    merc85 Well-Known Member

    Sep 2, 2020
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    #49 merc85, Jan 15, 2021
    Well what a development! I given up and listed her on the bay, Then a chap got in touch and told me he had the exact same problem.

    There is a O ring on the Tps that gets worn and swells causing a voltage delay when closing the throttle causing the incorrect signal to the ECU.

    Cure? Simply remove this O ring haha, So i did this last night and took her for a test ride this morning whilst picking up some essentials. BINGO!

    Job done no more cutting out! Thanks to all those who have helped we were getting very close TPS was next on the list.

    For interested i may as well post the Advert here, im going to leave the listing run think a Honda is next on the list, Will use her as intended over the winter if she doesn't sell.

    https://www.ebay.co.uk/itm/Triumph-Daytona-955i-Motorcycle-2003/284147021546
     
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  10. Tricky-Dicky

    Tricky-Dicky Crème de la Crème

    Dec 12, 2016
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    #50 Tricky-Dicky, Jan 15, 2021
    Glad to hear it's sorted, thought TPS might be the culprit but had no idea about the O ring....good news.
     
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