My F800gs STALLS LIKE ITS RUNNING OUT OF GAS! PLEASE HELP!!

Discussion in 'Parallel Universe' started by chunter, Jan 3, 2009.

  1. chunter

    chunter Adventurer

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    Yeah, but my issues were 2 miles apart before the new fuel pump. The problem was easily replicated on a low-ish fuel tank.

    Another 100 miles today.
    #81
  2. jigdog

    jigdog Been here awhile

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    Well...lets hope!
    #82
  3. bxr140

    bxr140 Flame Bait

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    Digging up an old thread...

    So, the past few weeks its been pretty rainy/windy in the bay area. I've had on 5-6 occations where the bike (at freeway speeds) would lose a good 20-30% of the power...similar to what it would feel like if the timing suddenly went flat. This running condition would stay pretty much constant until the bike was turned off and let sit for a while. To date the bike has stalled out twice--once at zero speed, once at very slow speed, both instances in conjunction with the 'power problem' noted above. In situations where the bike didn't stall, it would idle low and rough. ALL of the above situations started in extremely wet conditions, traveling at freeway speeds.

    Possibly related, possibly not, my low fuel light and my range are...uhh...broken. I ran out of gas ~3 miles after the low fuel light came on (with ~25 miles indicated range) a week and a half ago. I had 215 miles on the tank at the time, which does fall in line with the theoretical range of 4.2 gallons. The range and light had been spot on up to then, and I was pretty easy on that particular tank, so I thought I could make it the 3 miles to work and then fuel up around the corner for my trip home. :cry

    Since that time, my range has been consistently wrong. I'm fueling up with ~4.0 gallons around 195-205 miles (same as before the range/light went wonky), and my range says there's ~30-35 miles left.

    I'll be taking it to the dealer soon...more to come.
    #83
  4. ROYAL COACHMAN

    ROYAL COACHMAN Long timer

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    Regarding stalling issues brought on due to riding in rain, I may have a solution.
    My f800 has done this and the last time it stalled in the rain I was near my dealer and brought it in. They opened the air box to find standing water ( about 6oz or so) in the air box. The idler air by pass valve is located on the bottom of the air box also.

    When you close the throttle to shift or come to a stop, the air idle by-pass valve opens and sucks in the standing water stalling the motor.

    My service manager concluded that the air intakes are letting in a significant amount of water during heavy rains. (ram air effect)

    My service manager and I came up with a way to block rain from getting into the intake with out restricting air flow.
    [​IMG]
    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    I have tested these block-off plates in a very heavy rain yesterday and I could not get my bike to stall after 25-30 miles of interstate riding.

    I experienced stalling a dozen times before under the same severe rain conditions with out the block off plates.

    Let me say that I tried to make my bike stall the other day in the rain under every throttle position and rpm/gear/load condition and it ran perfectly.

    The plates do not effect performance that I can tell during normal weather.
    The service manager and I both ran the bike up to 100mph and could not tell anything different from a stock bike.

    BTW Gateway BMW is my dealer and they have been very good to me:clap
    Hope this may help!
    Thanks
    Glen
    #84
  5. dholaday

    dholaday Been here awhile

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    you'd think a motorcycle developed in Germany would be able to handle rain.:evil
    #85
  6. jessehere

    jessehere Ridin'

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    i am suprised that the dealer reccomends this patch/fix. if the bike cannot be used in the rain without stalling it should be recalled
    #86
  7. ROYAL COACHMAN

    ROYAL COACHMAN Long timer

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    Because BMW does not have a fix for this as of yet, this is a solution that both the dealer and myself dreamed up, fabricated and installed to see if our diagnosis was correct.

    Until BMW can come up with a permanent fix, this does work and my bike no longer stalls in the heavy down pours.

    I agree that no bike should stall out in the rain, but this was simple to make and does work for me.

    BTW my dl650 vstrom used to stall in a heavy down pour from water getting in and around the front cylinder spark plug boot

    Glen
    #87
  8. ROYAL COACHMAN

    ROYAL COACHMAN Long timer

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    Jesse, I did not want to wait for BMW to re engineer the air box or what ever this will take to fix.
    I ride year round here in MIssouri in all kinds of weather and I just want to ride, not have mike new bike tied up waiting for someone in Germany to solve a problem that in all honesty, was not to difficult to fix.

    I realize this may not be acceptable for some, but if your bike is stalling and ypu want a temporary fix, this might help.

    Glen
    #88
  9. Bayner

    Bayner Long timer

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    Well, that certainly makes sense! I suppose you could also extend the tube inside the airbox so as to not draw air from the bottom, sort of like the reserve on a fuel petcock?
    #89
  10. ]I)Money

    ]I)Money D NOT I

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    yes. if you get into a situation where it happens, lean the bike to the left and give it some throttle; it'll burn it off so you can go on (thanks Shannon).
    It takes a pretty good downpour,and Highway speed, to get it to happen.:deal
    #90
  11. DockingPilot

    DockingPilot Hooked Up and Hard Over

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    :huh
    #91
  12. The Griz

    The Griz Long timer

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    Was told by a BMW NA technical rep that water should not effect the air intakes even at highway speeds. I've been up to 70-80mph in the rain on mine with no stalling whatsoever. Must be another place letting water in.

    That said, with these bikes being fuel injected, it's possible that there's an error within the system on some. When you open the throttle on a fuel injected bike, it lets more air in. This air passes over a mass oxygen sensor. The sensor reads the amount of oxygen flow, tells the ECU, which in turn adjusts the fuel pump intensity/fuel nozzle spray amount to match (based on engine load and some other things). Interesting, but complex enough that if there's a problem with one part it will effect the whole system.
    #92
  13. ]I)Money

    ]I)Money D NOT I

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    Your guy is wrong.

    When it happened to me, it was pretty torrential, and only at highway speed.
    #93
  14. bxr140

    bxr140 Flame Bait

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    +1.

    However, I can't say for certain that its because of water in the airbox...though RC's discovery of water is rather concerning either way. An airbox should not accumulate water. Period.

    As far as the root cause, there seems to be some electronic connection or sensor that is affected by the conditions. Could be in the airbox...might not be. I don't *think* its as simple as a 'mechanical' issue of water in the intake charge.
    #94
  15. Singletrack_mind

    Singletrack_mind Cave Man

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    It may also be that we are talking about more than one type of problem. I know my engine quit running in bone dry conditions, and in fact I haven't ridden the thing in more than a heavy mist yet. (it's been a desperately dry winter here). That suggests that there's no way water was involved. I haven't even washed the bike yet. There was also no bad running before or after, and that account jibes with others I've read.

    I suggest that there might really be a rain related problem which involves higher speeds and serious water, and then another separate problem characterized by sudden death when shutting the throttle on the way to a stop or when downshifting into a turn where no water is present.
    #95
  16. The Griz

    The Griz Long timer

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    He's not "my guy." He's the Midwest Regional Field Service Engineer. He is one of five Employed by BMW to cover the USA. Travels a lot. Sees these bikes day in and day out. Know the F800GS inside and out. The water accumulation is not from the snorkel intakes. (You will believe what you will of course.) I've been up to to 70-80mph in torrential rain at least a few times. No problems.
    #96
  17. The Griz

    The Griz Long timer

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    +1
    #97
  18. tmex

    tmex Long timer

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    Just to close the loop. When your bike actually did run out of gas did it feel like the "stalls like its running out of gas" problem?
    #98
  19. bxr140

    bxr140 Flame Bait

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    Yes. It was a typical "hey dumbass, you just ran out of gas" feeling. Chug, chug, chug...die.

    I would always run my KLR to the reserve, and the GS running out of gas was pretty much the same...except for the push-my-bike-down-the-freeway part...:huh
    #99
  20. ROYAL COACHMAN

    ROYAL COACHMAN Long timer

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    As far as water getting into the air box from some where other than the air intakes, where would that be?

    When my dealer removed my air box and discovered water in the bottom of it, it was moments after a hard rain. They let me watch as they took apart the assembly. My service manager even commented on the air intake track being a closed system and that my air filter was soaked. Bottom line is air or water cannot enter the intake other than from the front of the bike. I have ridden in 2 hard rains in the time since I have installed those air intake block-off plates and no/zero/nadda/zip problems with stalling.

    I'm not saying this is for everyone, but it worked for me.

    Also forgot to mention my carbon canister was full of water and that was replaced under warranty, but I will probably remove that soon.

    Thanks
    Glen