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-   -   K 75 weirdness (http://www.horizonsunlimited.com/hubb/bmw-tech/k-75-weirdness-53749)

DRxBMW 15 Nov 2010 00:31

K 75 weirdness
Intermittent gremlins are such a bitch. Sixth sense is guessing an
engine electric issue.

At the point I do NOT know where to go next ! Maybe it's time to buy a
new GS and be done with it. LOL

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~

Two months ago, I experienced some intermittent weirdness on my K 75.
Engine would NOT rev over 3K without stumbling/stalling. Limped into a
service plaza, dumped the fuel suspecting contaminated gas,refilled
with fresh petrol, NO change.

Out of desperation, I re-inserted the ECU brain plug, BINGO, fired up,
away we go into the sunset. R&R the fuel filter upon return to the
house,new spark plugs,fuel pump,coil connections inspection, ignition &
kill switches seem OK.

Ran perfect, over 2800 miles __________ till this afternoon. :-(

ECU was un-clipped and clipped back in for the second time, ____ ball
game back on. Why is a mystery as it's NOT loose,corroded,etc. In the
garage, damn thing purrs like a kitten,unable to produce any weirdness,
go figure.


It is possible the TPS is sending a funky signal to the ECU to cut-off
to avoid over driving the engine ?
How long should a TPS last ?
Should I suspect a Halls Effect Sensor slowly going south ?
How long/mileage should a HES last ?

I seem to remember someone posting the electrical values of the TPS a
couple years back. Could you please post them again.

Wish I had a spare ECU to swap but they rarely fail. NO idea on how to
test one anyway.

1994 K 75 standard 253,000 miles (data point)

order of flailing on the slate for Monday

#1 re-check the coil connections

#2 ignition wires ohm readings

#3 visual & electrical inspection of the TPS

#4 Jeff Dunkle's HES hairdryer test

#5 ICU
don't you use some kind of anti thermal paste on the backside snobum ?

Anything else I'm missing here ? THANX

Stewart H 20 Nov 2010 17:54

My TPS reads 0.36 volts at idle smoothly going up to around 4.75 volts at full throttle, measured between the end pins, I know its different bike but I hope it will give some indication.

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