BMW K bikes (Bricks)

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1Back to top Go down   Wierd !! Empty Wierd !! Fri Jul 26, 2019 8:43 pm

stevenh

stevenh
active member
active member
On the never ending search for the solution to the misfire on my K100 LT. I replaced  the fuel pump and all the tank internals, and fitted a new 4 pin plug to the out of tank cable.
although the misfire continues the fuel pump was operating as it should. But then.........

As the Hall sensors are an issue over time. I replaced them with some aftermarket Halls. My problem is:- the bike is running with the same missfire, but now the fuel pump runs continuosly. Even if I turn off the ignition and take out the key. Fuel pump is still running, WTF I said to myself. The only way to stop the fuel pump was to disconnect the four pin plug.

Could this be a relay problem ?? Any electrical geniuses out there to point me in the right direction. ??

Cheers 
Steve

    

2Back to top Go down   Wierd !! Empty Re: Wierd !! Fri Jul 26, 2019 9:08 pm

RicK G

RicK G
admin
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I would be replacing the relay, you don't need a special one just a matching Bosch one.
Before that try removing the relay instead of unplugging the tank connection then replacing it to see if it is the relay.
I doubt that replacing the hall sensors would be directly connected with the pump running on but co-incidental.
As for the miss what have you done to diagnose the miss (I haven't been following the forum closely lately as I have had other BMWs in my life which are problematic and giving me a right royal dose of the shits) my dad always said "son if its got tits or wheels it will give you trouble" Very Happy


__________________________________________________
"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
    

3Back to top Go down   Wierd !! Empty Re: Wierd !! Fri Jul 26, 2019 10:20 pm

Laitch

Laitch
Life time member
Life time member
@stevenh wrote: Even if I turn off the ignition and take out the key. Fuel pump is still running, WTF I said to myself. The only way to stop the fuel pump was to disconnect the four pin plug.
Steve
Operating the kill switch wouldn't stop it?


__________________________________________________
1995 K75 81,000 miles
Wierd !! Usa-lo10
    

4Back to top Go down   Wierd !! Empty Re: Wierd !! Sat Jul 27, 2019 2:39 am

Arlina

Arlina
Moderator
Moderator
@RicK G wrote: my dad always said "son if its got tits or wheels it will give you trouble" Very Happy
More trouble; tits on wheels Razz Razz Razz

Sounds like a sticky relay, but power off on the bike means power off to the pump too.
Must be more to keep it going.
The only thing that suppose to keep power is the clock.

Bit of a bugger to diagnose from a distance, but indeed try with the kill switch and update us.


__________________________________________________
Wierd !! Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

5Back to top Go down   Wierd !! Empty Fuel pump not turning off Sat Jul 27, 2019 5:06 am

Phil Moser

Phil Moser
active member
active member
@Arlina wrote:
@RicK G wrote: my dad always said "son if its got tits or wheels it will give you trouble" Very Happy
More trouble; tits on wheels Razz Razz Razz

Sounds like a sticky relay, but power off on the bike means power off to the pump too.
Must be more to keep it going.
The only thing that suppose to keep power is the clock.

Bit of a bugger to diagnose from a distance, but indeed try with the kill switch and update us.
Had this on mine. With a weak or old battery, the starter relay contacts weld together and the starter runs all the time. The headlamp / load shedding relay is earthed through the starter and so, if you have this problem, switch on the headlights and see if they come on. If they don't, welded contacts are your problem. Open the relay and fix it.

    

6Back to top Go down   Wierd !! Empty Re: Wierd !! Sat Jul 27, 2019 5:18 am

Phil Moser

Phil Moser
active member
active member
@stevenh wrote:On the never ending search for the solution to the misfire on my K100 LT. I replaced  the fuel pump and all the tank internals, and fitted a new 4 pin plug to the out of tank cable.
although the misfire continues the fuel pump was operating as it should. But then.........

As the Hall sensors are an issue over time. I replaced them with some aftermarket Halls. My problem is:- the bike is running with the same missfire, but now the fuel pump runs continuosly. Even if I turn off the ignition and take out the key. Fuel pump is still running, WTF I said to myself. The only way to stop the fuel pump was to disconnect the four pin plug.

Could this be a relay problem ?? Any electrical geniuses out there to point me in the right direction. ??

Cheers 
Steve
Had this, on ALL my BMs ( and VW cars ). It's probably the Bosch metal spark plug caps. What I've had is a crack or dirt in the caps' insulators shorting the spark to earth. On all my engines I've put on non-metal caps. No more problems. On my K, I have Bougicord leads with straight caps and 90° coil connections. I've swapped the 2 dual output coils so that the 2 + 3 coil is in front because then standard Bougicord leads fit, but I can't remember the lengths. The bikes' been like this > 10 years. There's another advantage : the leads then come right up close to the BMW cover plate between the cams and you don't have to reach deep down pull the caps off the plugs.

Where did you get a new 4 pin plug for the tank ? I also need this.

    

7Back to top Go down   Wierd !! Empty Re: Wierd !! Sat Jul 27, 2019 8:27 am

Laitch

Laitch
Life time member
Life time member
The more I read the OP's performance complaint, the more I believe the ignition switch is at fault so I'm going to quit reading it. Laughing


__________________________________________________
1995 K75 81,000 miles
Wierd !! Usa-lo10
    

8Back to top Go down   Wierd !! Empty Re: Wierd !! Sat Jul 27, 2019 6:46 pm

daveyson

daveyson
Life time member
Life time member
@Arlina wrote:
@RicK G wrote: my dad always said "son if its got tits or wheels it will give you trouble" Very Happy
More trouble; tits on wheels Razz Razz Razz
Double trouble.



Last edited by daveyson on Sat Jul 27, 2019 6:50 pm; edited 1 time in total (Reason for editing : Added double trouble, prob should say quadruple.)


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

9Back to top Go down   Wierd !! Empty Re: Wierd !! Sat Jul 27, 2019 8:56 pm

RicK G

RicK G
admin
admin
@Laitch wrote:The more I read the OP's performance complaint, the more I believe the ignition switch is at fault so I'm going to quit reading it. Laughing
+1 A good clean will often do the trick.


__________________________________________________
"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
    

10Back to top Go down   Wierd !! Empty Re: Wierd !! Sun Jul 28, 2019 8:43 pm

stevenh

stevenh
active member
active member
@Laitch wrote:
@stevenh wrote: Even if I turn off the ignition and take out the key. Fuel pump is still running, WTF I said to myself. The only way to stop the fuel pump was to disconnect the four pin plug.
Steve
Operating the kill switch wouldn't stop it?
Nope !

    

11Back to top Go down   Wierd !! Empty Re: Wierd !! Sun Jul 28, 2019 8:45 pm

stevenh

stevenh
active member
active member
@RicK G wrote:I would be replacing the relay, you don't need a special one just a matching Bosch one.
Before that try removing the relay instead of unplugging the tank connection then replacing it to see if it is the relay.
I doubt that replacing the hall sensors would be directly connected with the pump running on but co-incidental.
As for the miss what have you done to diagnose the miss (I haven't been following the forum closely lately as I have had other BMWs in my life which are problematic and giving me a right royal dose of the shits) my dad always said "son if its got tits or wheels it will give you trouble" Very Happy

" Tits or Wheels " Yeah that would be something my old dad would say. Wouldn't be far wrong either. Wierd !! 44271

    

12Back to top Go down   Wierd !! Empty Re: Wierd !! Sun Jul 28, 2019 8:49 pm

stevenh

stevenh
active member
active member
@Phil Moser wrote:
@stevenh wrote:On the never ending search for the solution to the misfire on my K100 LT. I replaced  the fuel pump and all the tank internals, and fitted a new 4 pin plug to the out of tank cable.
although the misfire continues the fuel pump was operating as it should. But then.........

As the Hall sensors are an issue over time. I replaced them with some aftermarket Halls. My problem is:- the bike is running with the same missfire, but now the fuel pump runs continuosly. Even if I turn off the ignition and take out the key. Fuel pump is still running, WTF I said to myself. The only way to stop the fuel pump was to disconnect the four pin plug.

Could this be a relay problem ?? Any electrical geniuses out there to point me in the right direction. ??

Cheers 
Steve
Had this, on ALL my BMs ( and VW cars ). It's probably the Bosch metal spark plug caps. What I've had is a crack or dirt in the caps' insulators shorting the spark to earth. On all my engines I've put on non-metal caps. No more problems. On my K, I have Bougicord leads with straight caps and 90° coil connections. I've swapped the 2 dual output coils so that the 2 + 3 coil is in front because then standard Bougicord leads fit, but I can't remember the lengths. The bikes' been like this > 10 years. There's another advantage : the leads then come right up close to the BMW cover plate between the cams and you don't have to reach deep down pull the caps off the plugs.

Where did you get a new 4 pin plug for the tank ? I also need this.
Funny you should mention the caps and leads.  I have just got back from the local Auto shop with a set of leads just as you describe. No shit, ten minutes ago

    

13Back to top Go down   Wierd !! Empty Fixed itself Sun Jul 28, 2019 8:55 pm

stevenh

stevenh
active member
active member
Well the fuel pump turning off problem has fixed itself. All good now....... Yeah right

I did pull out the relay and clean up the contacts a couple of weeks ago. Serves me right eh.

I'm going to fit a new one. When I can find one that is. Things happen a little slower than normal here in NZ

    

14Back to top Go down   Wierd !! Empty Trigger wire test Sun Jul 28, 2019 9:01 pm

stevenh

stevenh
active member
active member
Just had a thought. I am replacing the ign leads and caps. the coils check out ok. I have traced the fault to no 4 cyl.

Anyone know a way to test the trigger/pulse wire to the coils. Does the this wire come direct from  the CDI

And.... do cyls 1-4 and 2-3 fire together in pairs.

    

15Back to top Go down   Wierd !! Empty Re: Wierd !! Wed Jul 31, 2019 3:27 am

Poupy

Poupy
Silver member
Silver member
@stevenh wrote: do cyls 1-4 and 2-3 fire together in pairs.
 Yes they do fire together, by pairs.

As concerns the injectors, they open all 4 together, i.e. several times per engine 4 strokes cycle.

    

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