Question about 2008 Suzuki GSX 1400

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Apparent misfire on sudden acceleration

Bike was running great at end of "summer".she`s spent a lot of time since then in the garage. took her out for a run a couple of weeks ago and noticed this problem. when you give it a sudden hard acceleration in any gear there is a momentary misfire , only for a split second but the bike lurches forward immediately after and runs great until you give it another fistfull. a friends 14 also has the same problem but his has been doing it for some time and we have not been able to find the cause. the ecu`s have been swopped with good bikes change the alarm / remote start / immobiliser has been change new fuel and  injector supply rail and injectors cleaned change any ideas are welcome thanks

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  • paulk_metcal Jan 03, 2009

    not concidered that as they were changed 2000miles ago.but its worth a try as nothing else has changed.

  • paulk_metcal Jan 24, 2009

    plugs changed improvement.
    Took her to garage .they have had her for over a week now ,been on Dyno and diagnostics.
    Both Primary and Secondary throttle position sensors are faulty. neither will adjust into the necessary resistance values.
    Waiting for replacements to be fitted next week.
    Will let you know the results when i get her back.
    Cost so far ......300 quid

  • Anonymous Jan 30, 2009

    Occasionally backfires occur on change-downs (throttle blip) through intake manifolds in the lower gears .Seems worse when day temperature is hotter.Advice is welcome

  • Anonymous Apr 27, 2009


    I have exactly the same problem with my 2001 gsx1400.

    New mapping, new plugs, new primair throttle position sensor nothing seems to work.

    If I accelerate gradually, it runs fine. If I give full throttle suddenly, it will shiver for a split second and then take off.

    Who can advise?


    Hans Eisink

  • eisink Apr 27, 2009

    I have exactly the same problem with my 2001 gsx1400.

    Changed plugs, primary TP sensor, mapping, used injection cleaner fluid.

    No result. Dutch Suzuki tuning specialist found out that the TP sensor was faulty, but never saw this error before.

    I hope somebody can advise.


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Check the tank from inside- if it was not fully loaded with gas it tends to corrode during winter . Corrosion forms send like debris which creates problems for injectors.

Posted on Jan 20, 2009

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Have you changed the plug ?

Posted on Jan 03, 2009

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