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Thread: F800 GSA Rough idle and quits

  1. #1

    F800 GSA Rough idle and quits

    Hello everyone!
    I ride a 2017 F800 GSA, and recently have been having the following issues and am trying to nail down what it could be.
    All of this presents after the bike has been sitting out in the sun while I'm at work (Alabama, so around 90*F). I will start the bike up, and it will idle kind of roughly with occasional rpm dips. Then when I'm riding, usually in a lower gear at slow speeds, the bike will idle down and the engine will quit (pulling the clutch in really only saves it about 50% of the time). Most of the time, I can fire it back up, and she will go on chugging, occasionally it will take 2-3 tries to get it to turn over. The engine will die anywhere from 4-10 times on my 10 mile ride home. It has yet to die when I'm riding in in the morning.
    Background on the bike:
    2017, 8K ish miles, met all service/maintenance intervals.
    Really appreciate any and all suggestions!

  2. #2
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Welcome to the forum!
    Maybe the next time it starts chugging, open the fuel cap and see if that changes the condition.
    Good luck.
    Gary
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  3. #3
    Registered User drneo66's Avatar
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    What happens if you open up the gas cap before riding home? The charcoal canister has been known to give some people problems.

    Next I'd double check that you have a healthy battery and no water in the fuel. Then move on to a possible vacuum leak or a dying fuel pump/pump controller.

    Do you know anyone with a GS911 or motoscan? There may be fault codes that will further help with a diagnosis
    Current: 2007 BMW R1200RT, 2013 F800GS
    Former: 1995 BMW K75S, 2009 BMW G650GS
    MOA Member #:150400, IBA#: 37558

  4. #4
    Registered User drneo66's Avatar
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    Quote Originally Posted by Omega Man View Post
    Welcome to the forum!
    Maybe the next time it starts chugging, open the fuel cap and see if that changes the condition.
    Good luck.
    Gary
    Dang, Gary beat me to it!
    Current: 2007 BMW R1200RT, 2013 F800GS
    Former: 1995 BMW K75S, 2009 BMW G650GS
    MOA Member #:150400, IBA#: 37558

  5. #5
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Quote Originally Posted by drneo66 View Post
    Dang, Gary beat me to it!
    Great minds thinking alike
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  6. #6
    Thanks for the help! I'll keep you all updated with what she does!

  7. #7
    Registered User Guenther's Avatar
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    The description sounds to me like a failing air intake temperature sensor. I am not sure but the temperature displayed on the dashboard might be from this sensor as well.

    /Guenther
    2017 F700GS - I wish it had a drive shaft

  8. #8
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Quote Originally Posted by Guenther View Post
    The description sounds to me like a failing air intake temperature sensor. I am not sure but the temperature displayed on the dashboard might be from this sensor as well.

    /Guenther
    I kinda like that thought as well......especially if a critter has got into the air filter/box/intake and peeeed
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  9. #9

    F800 GSA Rough Idle and Quits

    Sounds like a problem that some 2006 era F650GS bikes had. If the ignition was switched on and the start button immediately pressed, the engine would run for a minute or two and then just quit. But it would always restart. The problem was supposedly in the intake air sensing. The sensor had to heat up to take a good reading before air was flowing over it. The fix was to turn on the ignition, count to 10, then push Start. Worked every time!

  10. #10
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Quote Originally Posted by bnick View Post
    Sounds like a problem that some 2006 era F650GS bikes had. If the ignition was switched on and the start button immediately pressed, the engine would run for a minute or two and then just quit. But it would always restart. The problem was supposedly in the intake air sensing. The sensor had to heat up to take a good reading before air was flowing over it. The fix was to turn on the ignition, count to 10, then push Start. Worked every time!
    Welcome to the forum!
    On my F800GS I don’t wait a specific amount of time but do wait until the “needles” get through their sweep. I can see how it could make a difference.
    Enjoy the forum.
    Gary
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  11. #11

    Resolved???

    Thank you to everyone for your help! Out of an abundance of concern for my bike, (because who here doesn't make rash decision with their bikes?!) I have done the following and the issue seems to have been alleviated:
    -Opened up the air filter, cleaned it out and cleaned the feeder tubes.
    -Disconnected the battery (in order to get to the air filter)
    -Opened up the fuel tank, removed the fuel pump/filter and drained them (watch out for that O-ring when you're putting it back in)
    -Occasionally open the filler cap prior to start if she's been in the sun.
    -Wait a bit longer after turning to ignition prior to crank
    One of these, or a combination of the actions seems to have brought my F800 and I back to the same page!

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