BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   Can Water Temperature Sensor be Bad?????? Empty Can Water Temperature Sensor be Bad?????? on Fri Mar 16, 2018 11:43 pm

billhutchsat

avatar
active member
active member
My 89 K100RS has been in a no start, poor enrich running condition. Upon cleaning up the water temperature sensor, the engine now is in a hard starting condition and the engine runs poorly in an enrich running position.

My question are these:

Can the water temperature sensor start going bad but still allow the engine to be started? Can a bad water temperature sensor cause a poor, enrich running, engine? When I disconnect the water temperature sensor harness while the engine is running the engine straiten up and runs like it should. I do not really understand the relationship of the temperature sensor to the Fuel Injection Control Module except that it passes a ground to Pin #10 on the Fuel Injection Control Module. Can I have a good water temperature sensor and a bad a Fuel Injection Control Module? The engine will not start if the sensor wiring harness is disconnected from sensor.

I attempted to ohm the sensor but did not understand the ohm results. I have a new sensor on order but I am wondering if I can have other problems causing my hard starting, poor, enrich running engine on my K100RS.

Any comments, suggestions, advice or recommendations are welcome and appreciated.

Bill Hutchens
San Antonio, Texas
03/16/2018

    

RicK G

RicK G
admin
admin
Yes it surely can. I have seen it on many cars and bikes. They don't actually stop but just give the ECU bad info.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

charlie99

charlie99
VIP
VIP
often the sensor connections (wiring side as well ) can be corroded  get some deoxit ???

also the threaded relief into the water stub can become corroded so that a higher than normal resistance between the sensor body and the water stub threaded section .


measure from the gearbox connection point (to battery ) and the body of the temperature sensor  meter on low ohms , it should measure  below 1 ohm  if not  remove the sensor and clean it and the threads up

I installed an additional washer (copper , soldered  so that is presents a lead- tin surface ) between the sensor and the water stub body , I figured the aluminium washer that I removed was so corroded that some type of electrolysis had set up with the dissimilar metals and location


good luck


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OCan Water Temperature Sensor be Bad?????? Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
The temperature sensor provides the enrichmt function that used to be done by the choke.

When the engine is cold it has a resistance of around  2500 ohms.  At normal operating temperature it drops to a round 250 ohms.

A dirty connection will make the engine run like the choke is stuck.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum