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Thread: 08 r1200rt - stalling issue

  1. #1
    Registered User 185274's Avatar
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    08 r1200rt - stalling issue

    It has only started happening over the past 5 or so days, by the RT is starting to idle extremely roughly and had stalled a couple of times while waiting in traffic. Seems to be worse after it at running temperature. I ran some Techron through it the week previous. Apart from that, I'm at a loss as to why it behaving so badly. Any ideas?

  2. #2
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    The symptoms you're experiencing are consistent with a failing Fuel Pressure Controller (FPC). I think you can search this forum for more info, but unfortunately you will have to either bypass it temporarily or replace it. It could die completely at any time potentially leaving you stranded somewhere. (I assume there are no yellow or red warnings on the dash when it quits).

    Or, it could be something else entirely, like a battery cable loosening up or an ignition system problem. My first guess would be the FPC.
    '14 R1200GS,
    Priors: '13 K1600GT, '08 R1200RT, '04 R1150RT, '05 R1200GS, '73 R75/5.

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    This may not be the same thing, but I had an issue with my 05 RT idling a little rough and it appeared out of the blue. It even cut out twice while coasting in traffic as I blipped the throttle. On the advice of another I did the following: turn bike ignition on but don't start the bike, roll the throttle from fully closed to wide open then back to closed again slowly - do this 3 times. Then start the bike. No problems since (4-5k miles).

  4. #4
    Registered User mneblett's Avatar
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    A third possibility is that you have a vacuum leak -- it's not unheard of for one of the fuel vapor recovery purge hoses to come off their throttle body nipple, leaving the nipple as a wide-open air intake path on one side of the motor.
    Mark Neblett
    Fairfax, VA
    #32806

  5. #5
    Registered User 185274's Avatar
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    Thanks for the feedback. Right - no warning lights at all. But it has been idling rough which makes me think the vacuum line could be the prime culprit.
    I'll check all the above and report back when I have some findings. Geez I hope its not the FPC - that sounds expensive.

  6. #6
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    And it also could b a sticking idle stepper which produces exactly the described symptoms
    If its the fpc. you'll get stuck eventually because the bike will fail to run at some point- they only get worse once they start to go.
    The other items listed will just continue to be an annoying and modest hazard..
    Hexheads and camheads don't benefit much from computer relearn attempts- they're fundamentally different than oldr Motronics units..

  7. #7
    Registered User rickyd's Avatar
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    Have you eliminated the possibility of a batch of crummy fuel? Techron could only do so much.
    Rick

    '06 BMW R1200RT
    '74 Moto-Guzzi 850-T

  8. #8
    Registered User 185274's Avatar
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    Emptied the tank after it first started happening. Bad fuel was my first thought as well.
    I checked out the FPC. The compartment was well sealed, although it looks as though I have the original/nonpowder coated controller.
    I decided to take the left hand lower plastic off, because I could, and one thing that did catch my attention was the oil build up and gunge around what appears to be the lowerside exit from the airbox to the throttle bodies (photo attached).
    Everything looked clean apart from this. Is this normal?
    Attached Images Attached Images

  9. #9
    A bozo on the bus deilenberger's Avatar
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    Not exactly "normal" - but it does happen if the oil is badly overfilled (by 1/2 quart or so..)

    The puzzling thing is how the oil is escaping from the airbox (the crankcase is vented into the bottom front corner of the airbox.. excess fumes will condense as an oil puddle in the bottom of the airbox, DAMHIK..) I had a similar (not as bad) leak on the other side of the airbox, that dribbled down on the transmission, ran back to the near the swingarm pivot and accumulated on the accordion boot on the front of the swingarm.

    Going in with rags and paper-towels attached to a claw thingie (flexible pickup tool) and mopping up the oil puddle from inside the airbox cured the "leak". I went in through the air-filter opening after removing the filter.

    You may also want to make certain the crankcase vent hose (left side of your photo) is attached correctly to the airbox, and isn't cracked.
    Don Eilenberger http://www.eilenberger.net
    Spring Lk Heights NJ NJ Shore BMW Riders New Sweden BMW Riders
    '07 R1200R (current ride) and some bimmers.. and a Porsche

  10. #10
    Registered User 185274's Avatar
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    Thanks Don.

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