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Thread: 2006 K1200S Stranded me; diagnosis questions.

  1. #16

    UPDATE! 83.33% Fixed; what...the...fudge?!

    Installed new fuel pump. Just came back from a many hour ride in 88-89 degree heat with only one stop for gas. An hour in, ONLY 2d gear developed a quick, off-on hesitation which never happened at high rpm when accelerating to go up through the gears, but did it a lot otherwise. It never showed a desire to quit, however; just the sensation someone had flicked the light switch off and back on in less than a second. And despite attempts to get it to replicate in other gears, travelling for 10-15 minutes straight in 1st and 3rd and 4th gears, never could get it to replicate.

    Wut the flip do I try next, guys? This was with a brand new, not rebuilt, fuel pump, and common sense tells me that if it were failing, it wouldn't fail in one gear and not in the others. I had even considered that maybe I got a bad batch of the Luqui-Moly additive which harmed my fuel pump, but it wouldn't just prevent it from working in second gear. And the same is true if water had gotten in the gas. I did install the Booster Placebo, er, plug, but how could it cause this? And an ECU can't "fail" in this manner, can it?

    I'll see what codes, if any, it threw tonight after cleaning it thoroughly. Car hit a dead deer carcass bloated with gas in front of me, popped it like a balloon, and sprayed me and my bike all over.

    But hey, it was a pretty day to take a ride out through the country, and this time, ol' Brunnhilde didn't strand me.

    As always, thanks for any help/suggestions.

    EDIT: If this continues, how about the electrics to the pump itself? Can they do screwy, gremlin-like things which would affect different pumps, but in different ways?

  2. #17
    Left Coast Rider
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    Quote Originally Posted by dobervol View Post
    ...just the sensation someone had flicked the light switch off and back on in less than a second. ......
    Leads me to believe you have an electrical, not a fuel, issue. But heck, I'm as puzzled as you.

    I half want to say check your sidestand switch or the wiring from your ignition switch or the engine shut off on the handlebar switch.
    Last edited by BC1100S; 07-13-2018 at 03:10 AM.

  3. #18
    ...and my gremlins get more interesting. Ambient temp. DOES affect what's going on. More trips with the new fuel pump, and while the problem is still limited to 2d gear, it totally disappears when the temp. goes down to the low 80s. While the bike has not thrown a code for it since the new pump was installed, I've ordered the electric fuel pump controller, BMW part #16 14 8 523 262, and will be installing.

    It did throw 2 codes when my bike just quit, and failure of the electric unit is acutally a more common problem than I realized, from searching innerwebs. The same part covers many years and many different models, and the theory is that the fins on the thing are an insufficient heat sink for cooling the unit, as the location of the unit, on the front of the gas tank, shielded from air flow, would make ambient temperature matter, since it is in effect air-cooled. This would also mean that those in warmer climes are more likely to experience a failure.

    Accordingly, because it can fail suddenly and catastrophically, leading to "won't start and won't run," a pretty big problem, I'm replacing the thing, and also am buying an emergency temporary bypass cable to power the fuel pump directly from the battery from burnsmoto, as well as never leaving home without the tools to allow me to remove the gas tank. Most tool kits will include the T25 bit or wrench, but most will NOT include the big hex bit necessary to remove the narrow end of the tank under the seat.

    Will update everyone after next install (removed tank once for BoosterPlug install, a second time for fuel line hardware replacement after plastic stock fittings cracked, a third for the new fuel pump, and now this will be the fourth!) and after I've ridden in 90 degree weather, since the problem only seems to appear from high 80s upward.

    Normally I wouldn't post all this, but I'm hoping that my tale of woe might save a fellow rider some misery in the future.

  4. #19
    not so retired henzilla's Avatar
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    If the original controller module is silver, yeah a fail potential, the newer units are anodized and black.
    Steve Henson
    SABMWRA MOA Club#62's Flat Fixer/ current forum moderator
    It's not the breaths you take, but the moments that take your breath away-D.Dillon/G. Strait

  5. #20
    Quote Originally Posted by henzilla View Post
    If the original controller module is silver, yeah a fail potential, the newer units are anodized and black.
    Mine is black, but anodizing only stopped the problem of failure due to corrosion; they didn't make the cooling fins larger, from what I can tell. With my unit throwing 2 codes, I'd rather be safe than sorry. Of course, if I replace it and the wierd 2d gear issue persists, I'll report that as well, but at that point, I'd be running out of things to replace/fix.

  6. #21
    not so retired henzilla's Avatar
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    The only does this in second gear is a scratcher for sure.

    Another fine re-engineered item in the fuel supply of this model is the airbox and idle control valve screwed to it. The new box had a lot larger opening and larger idle control valve with tubes running to throttle bodies. I have pictures of both, but on a different computer.


    Seems GT's were more prone to a warped airbox...may be the dual air inlets of the S didn't allow the box to warp as badly. Anyways, caused a stall issue more often after a long run. I replaced two on early K12GT's. Neither of our two S's presented that issue.

    The stick coils will not show as a failed unit, so pretty much need to either replace all four or narrow down a bad one, which on that model is a PITA compared to a Boxer. The FPC on the R12XX's sat in a well on top of the tank and they corroded,leaked and failed. The location on the K at least has it vertical, so the failure rate is lower.
    Never concerned with heat, but we avoided anyplace that the air was not moving if possible on these models
    Hope you narrow it down
    Steve Henson
    SABMWRA MOA Club#62's Flat Fixer/ current forum moderator
    It's not the breaths you take, but the moments that take your breath away-D.Dillon/G. Strait

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