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51Back to top Go down   K1100LT sidecar - Page 2 Empty Success! Fri Dec 31, 2021 2:18 am

Rockman


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All up and running again. All I need to do now is tidy up the sidecar wiring and give it an oil & filter change and its ready for a rego inspection.

Here's what I found;

The intermittent starting and stopping problem was an earth lead that had been left off the battery by the PO. It would earth out on the frame from time to time and the bike would go until it was moved.  It wasnt easy to spot as it was hidden under a sidecar mount. Connect this to the battery and it would start and run well FOR A WHILE, then it would stop, but would restart when it had cooled down. Classic HE sensor failure. Luckily I had a new sensor on order from Motobins and even better it showed up today. Fitted it and all is well in the universe.

So now I have 2 u/s HE sensor plates. I'll put new sensors on these and put them away as spares.

Many thanks to all who contributed to the fault finding.

    

52Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Fri Dec 31, 2021 5:20 am

Arlina

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Good one Smile

Now ride sc1


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K1100LT sidecar - Page 2 Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

53Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Tue Jan 04, 2022 4:39 am

charlie99

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Great to hear Phil . Good luck with the rest of it


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'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OK1100LT sidecar - Page 2 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 ..
    

54Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Sat Jan 15, 2022 10:00 pm

Rockman

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Registered, but not back on the road. The battery shat itself and wont hold charge. This happened during the blue slip inspection of course. I'll chase up a new battery tomorrow.

    

55Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Sun Jan 23, 2022 7:55 pm

Rockman

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More problems - or the same one back again.

What it does is start and then immediately stop again after maybe 1 or 2 seconds. It was running well up until last week. I did put a new battery in.

I did get it to run for a few minutes once, then it started missing and eventually stopped. It almost sounds like its running out of fuel but there is enough in the tank and I can see the returned fuel from the pump going back into the tank as it is cutting out.

It has a new pressure regulator, fitted by the po, and I checked all the fuses and relays. All seems normal there.

I'm wondering if I have a sensor somewhere which is playing up and the Motronic unit is cutting off the injectors and/or ignition because it doesnt have that signal. Unfortunately I dont know enough about the system to work out which sensor, or if it is something else.

Any suggestions?

    

56Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Sun Jan 23, 2022 9:19 pm

MartinW

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Once it cuts out check to see if the plugs are wet or dry and check for spark at the plugs.
Regards Martin.


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57Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Sun Jan 23, 2022 11:12 pm

Rockman

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@MartinW wrote:Once it cuts out check to see if the plugs are wet or dry and check for spark at the plugs.
Regards Martin.
Hi Martin,

I pulled the front plug after it cut out. It was dry. It was a bit difficult to check spark after it cut out because pressing the starter just starts the whole cycle over again. What I did was leave the front plug out and try a start on 3 cylinders. It sort of did and I did notice that I still had spark as it ran down the revs after it had cut out.

I take it from this that its the injectors that are being switched off after the initial start and I still have fuel being supplied to the fuel rail, and spark at the plugs.

So what do you recon?

    

58Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Sun Jan 23, 2022 11:26 pm

MartinW

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At least you have a starting point, test the Motronic or go to the troubling shooting sequence post and work your way through it.
Regards Martin.


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59Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Sun Jan 23, 2022 11:45 pm

Point-Seven-five

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The Motronic has a rudimentary diagnostic function that you can access with an LED connected to the black diagnostic plug that is somewhere under the seat.

https://www.kforum-tech.com/electrical/PDF/Motronic%20Fault%20Codes.pdf


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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
    

60Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Mon Jan 24, 2022 11:33 pm

Rockman

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@Point-Seven-five wrote:The Motronic has a rudimentary diagnostic function that you can access with an LED connected to the black diagnostic plug that is somewhere under the seat.

https://www.kforum-tech.com/electrical/PDF/Motronic%20Fault%20Codes.pdf

Interesting - I ran the diagnostics as per the link above and got code 4444, which as I read it says there are no faults stored.

This sort of eliminates the oxygen sensor, TPS, HES, air temp sensor and water temp sensors.

What is left??? Is there a link that connects once the engine is running through a relay or something? Dunno.

    

61Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Yesterday at 12:13 am

RicK G

RicK G
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There is a connection from ECU to the Motronic relay, the ECU extends an earth to the relay when the start button is pushed and when the engine is running if there is a signal from the hall sensors. If that earth is removed when you release the start button the engine will run for 1.5 seconds same as when the fuel pump cuts out 1.5 seconds after the start button is released if the engine is not going.



Last edited by RicK G on Tue Jan 25, 2022 12:19 am; edited 1 time in total


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"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 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

62Back to top Go down   K1100LT sidecar - Page 2 Empty No go Yesterday at 12:14 am

daveyson

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Can the injectors be heard ticking with the help of a screwdriver?


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63Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Yesterday at 12:15 am

Point-Seven-five

Point-Seven-five
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What is the tach reading when the engine is running.  The Motronic needs a 700 rpm signal from the hall sensors to keep the fuel pump running.


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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
    

64Back to top Go down   K1100LT sidecar - Page 2 Empty Re: K1100LT sidecar Yesterday at 1:35 am

Rockman

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@RicK G wrote:There is a connection from ECU to the Motronic relay, the ECU extends an earth to the relay when the start button is pushed and when the engine is running if there is a signal from the hall sensors. If that earth is removed when you release the start button the engine will run for 1.5 seconds same as when the fuel pump cuts out 1.5 seconds after the start button is released if the engine is not going.
This is sounding hopeful. The symptoms I'm getting sound exactly like this. Tomorrow I'll go searching for an earth starting at the Motronic relay and working towards the Motronics unit. Since it has run properly time to time I'm guessing a bad or loose connection somewhere. The Brown/Blue maybe?K1100LT sidecar - Page 2 1994_e10 from

    

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