BMW K bikes (Bricks)

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1Back to top Go down   extra wire from one injector Empty extra wire from one injector on Mon Jul 20, 2020 9:11 pm

Rockman

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My K1100 has/had an extra wire running from the front injector up under the tank somewhere. This has now broken off and nothing now works. Has anybody any idea on what it might have been connected to? I'd like to remove it completely as it is obviously a bodge.

    

2Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Mon Jul 20, 2020 9:44 pm

Point-Seven-five

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I'm going to guess it was a 12v feed to the injectors.  The Motronic fires the injectors by grounding them.


__________________________________________________
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
    

3Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Tue Jul 21, 2020 7:29 am

Dai

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I think I'm with .75. The 12v feed should be a green/red wire.


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'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

4Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Tue Jul 21, 2020 8:32 am

Point-Seven-five

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The previous owner may have added the wire to correct a problem with the ECU, the ECU connector or the injector harness that was preventing the injectors from getting power.


__________________________________________________
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
    

5Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Tue Jul 21, 2020 9:52 am

Laitch

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@Rockman wrote:My K1100 has/had an extra wire running from the front injector up under the tank somewhere. This has now broken off and nothing now works.
Does nothing now works mean there are no lights, no starter and no fuel pump activation?


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1995 K75 77,000 miles
extra wire from one injector Usa-lo10
    

6Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Tue Jul 21, 2020 7:47 pm

Rockman

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@Laitch wrote:
@Rockman wrote:My K1100 has/had an extra wire running from the front injector up under the tank somewhere. This has now broken off and nothing now works.
Does nothing now works mean there are no lights, no starter and no fuel pump activation?

No fuel pump activiation. Lights etc are removed at the moment. I wonder if I have a blown fuse as well - I'll have to check this.

Previous owner has on knowledge of it, but has a complete wiring harness that he is sending me. As it is coming apart for refurbishment I think I'll fit the new harness during reassembly and will probably cure the problem in the process.

    

7Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Sat Jul 25, 2020 10:06 am

charlie99

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wow, another k phil ?

do you need help ? im not far off ..

but it does sound like you have blown a fuse  or a bad kill switch issue


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Oextra wire from one injector 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 ..
    

8Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Sat Jul 25, 2020 6:59 pm

Rockman

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@charlie99 wrote:wow, another k phil ?

do you need help ? im not far off ..

but it does sound like you have blown a fuse  or a bad kill switch issue
Slowly slowly with this one Charlie.

Well, I found part of the problem. Rick had put an Anderson plug in the leads from the battery. This had literally fallen apart (the plastic parts of it) and I no longer had a connection. I repaired this so and the starter etc now works, but not the fuel pump.

Does the 12v feed for the injectors go via the temperature sender or something so it will cut off when the bike overheats? Maybe the fuel pump is similarly controlled. Dont know yet.

    

9Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Sat Jul 25, 2020 11:16 pm

charlie99

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normally the ecu sends the relay trigger for the fuel supply , from memory on ignition on the fuel pump should sound for a second or so 

side stand issue perhaps ?


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Oextra wire from one injector 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 ..
    

10Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Sat Jul 25, 2020 11:40 pm

RicK G

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Side stand switch was bypassed so may pay to check the scotchloc at the plug under the right side cover


__________________________________________________
"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
    

11Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Sun Jul 26, 2020 2:22 am

Rockman

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I could hear the fuel pump for a second or 2 but this all changed when the extra wire broke so I think the problem lies there.
Anyway, doesnt matter now as I have started disconnecting wiring so that I can remove the frame for repainting. I think most problems will resolve themselves when I start reassembly.

    

12Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Sun Jul 26, 2020 6:55 am

Dai

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Or get worse... Twisted Evil


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

13Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Sun Jul 26, 2020 8:27 pm

Rockman

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@Dai wrote:Or get worse... Twisted Evil
I was looking for an emoji involving a box of matches but couldnt find one.

    

14Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Mon Jul 27, 2020 7:53 am

charlie99

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extra wire from one injector 44271


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Oextra wire from one injector 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 ..
    

15Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Wed Jul 29, 2020 3:47 am

Rockman

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Well there is a slight possibility I am an idiot. Today I noticed the earth wires from the injectors were not connected to the fuel rail mounting screw as they should be.

    

16Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Wed Jul 29, 2020 5:47 am

Dai

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???? That's not on any of my bikes.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

17Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Wed Jul 29, 2020 7:10 am

RicK G

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The injectors aren't directly earthed but have power directly to them and an earth pulse from the ECU to fire them. That earth may serve the ECU but I cant find anything in my circuits to confirm that.


__________________________________________________
"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
    

18Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Wed Jul 29, 2020 7:59 pm

Rockman

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Heres a pic - looks factory, is part of the injector wiring and was earthed on the fuel rail screw shown. No other place it could go from what I can see. Any suggestions?

Probably I'll just reconnect everything, put the tank back on and see what happens.

extra wire from one injector Img_2612

    

19Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Wed Jul 29, 2020 8:49 pm

RicK G

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It is very definitely an earth and should be there but as to whether it is actually for the ECU I cant say. It usually is on a 10mm bolt directly to the head behind the fuel rail where the fairing mount also bolts.
Just had a good look it goes where the red arrow points.
extra wire from one injector Image110



Last edited by RicK G on Wed Jul 29, 2020 10:26 pm; edited 1 time in total


__________________________________________________
"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
    

20Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Wed Jul 29, 2020 9:18 pm

Point-Seven-five

Point-Seven-five
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Yes, that's definitely a ground.  The original post had me thinking you were talking about a wire coming from an injector connector.  I was thinking that it was something that a previous owner had added to work around a different problem.  Your photo shows a wire coming out of the harness, not an injector.

Back to square one.


__________________________________________________
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
    

21Back to top Go down   extra wire from one injector Empty Re: extra wire from one injector on Wed Jul 29, 2020 10:30 pm

Rockman

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@RicK G wrote:It is very definitely an earth and should be there but as to whether it is actually for the ECU I cant say. It usually is on a 10mm bolt directly to the head behind the fuel rail where the fairing mount also bolts.
Just had a good look it goes where the red arrow points.
extra wire from one injector Image110

Yes I figured that. Since it goes into the engine wiring it may be that the fuel pump doesnt go without it so back to plan C and reconnect everything and see what happens.

    

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