BMW K bikes (Bricks)

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1Back to top Go down   Another K100 Joins the Shed Empty Another K100 Joins the Shed on Wed Nov 19, 2014 1:53 am

Tom FKR

Tom FKR
Life time member
Life time member
G.day All, Ready to fire up the beast but no luck. There is no power to fuse no 6 and therefore no power to the FI relay. There is power to all other fuses and power to the ignition switch. Any ideas will be most welcome. Cheers TomAnother K100 Joins the Shed Icon_evil

    

2Back to top Go down   Another K100 Joins the Shed Empty Re: Another K100 Joins the Shed on Wed Nov 19, 2014 2:56 am

RicK G

RicK G
VIP
VIP
Fuse 6 gets power from the FI relay it doesn't supply power to it so it is the FI relay that is not operating. It gets power from fuse #1 and it supplies power from the red wire that is direct to the battery. The earth to the relay coil is what controls the relay and that comes from the ECU on a Yellow/brown wire at terminal 7 on the ECU and terminal 85 on the relay. That earth is only there when the engine is running and the hall sensor for 2-3 is sending signal or when you press the start button it gets earth for 1.5 seconds and will continue to send earth while the starter is cranking.
That earth is the common place to get problems and it is difficult to read it with a digital meter when cranking or just touching the start button.
First does the starter engage when you press the start button. can you hear the FI relay click when you press the start button.
Check the earths on the gearbox and under the tank because if that earth on the gearbox is faulty the ECU cant supply it to the FI relay.
If you want a full colour circuit PM me and I will give you a link to my drop box.
If you feel it is the ECU then I have a worker that I can bring to Guyra to lend or sell.


__________________________________________________
"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

3Back to top Go down   Another K100 Joins the Shed Empty Another K100 Joins the Sged on Wed Nov 19, 2014 6:34 am

Tom FKR

Tom FKR
Life time member
Life time member
G'day Rick,thanks for that reply.Starter motor engages,fuel pump runs for about a second but I coul'nt hear the relay click.( Deafness aka old age is setting in). Earth is not the problem as an extra lead from the cluster under the tank has been run to the battery as well as an extra lead to the frame and gearbox with all connections nice and clean. Anyway tried to start the beast again and it started but ran as rough as. I suspect dirty plugs or bad HT connections to the plugs.
Thanks again Rick - will keep you posted. Some photos will be put up soon.
Cheers Tom

    

4Back to top Go down   Another K100 Joins the Shed Empty Re: Another K100 Joins the Shed on Wed Nov 19, 2014 6:51 am

RicK G

RicK G
VIP
VIP
If the fuel pump runs and it spluttered to life briefly then the electrical part of the FI is working. Try new plugs and cleaned injectors check coils and leads for corrosion at plug points and HT leads where they join the plugs.


__________________________________________________
"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

5Back to top Go down   Another K100 Joins the Shed Empty Re: Another K100 Joins the Shed on Wed Nov 19, 2014 6:57 am

charlie99

charlie99
VIP
VIP
perhaps a bad relay too tom ? been known to happen

but best guess is that the starter brushes - comutator is in need of a clean ?

isn't hard to do and discount this as an issue ...in the great scheme of things

but perhaps under tank connections need a clean up tom ....get out the deoxit and do that connector that does the hall sensor connections ..(have found some that look like they are powder coated with dust once the connector is disengaged

good luck mate .... following your progress


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OAnother K100 Joins the Shed 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 ..
    

6Back to top Go down   Another K100 Joins the Shed Empty Re: Another K100 Joins the Shed on Wed Nov 19, 2014 12:32 pm

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
We had something similar with a K75 at a friends workshop.

The connector to the computer unit under the seat was the problem. Opened it up and cleaned contacts and reattached and it was fine. Do both as Rick G has said, its simple and a no cost exercise that pays dividends. We cheated a bit by keeping the finger on the starter button for a moment after the engine started to fire and it was still getting fuel. Finger off it immediately died. As Rick G put it, this confirms the fuel injection is working.

I have tried to put it correctly, correct me if I am wrong. There are two earth connections, one for the starter which is only used for starting and which also powers the fuel pump for starting, and the second one for the fuel injection which keeps the engine running.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 102,50 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell No 34,600 miles
    

7Back to top Go down   Another K100 Joins the Shed Empty Re: Another K100 Joins the Shed on Thu Nov 20, 2014 8:54 am

Ed

Ed
Life time member
Life time member
Tom , try swapping your horn relay to the FI relay for a brief test as this will get you going. they are almost identical, except for the double 87 pin . I have a spare ECU here if you need to check that. anything else that I could help out with? just ring.


__________________________________________________
1987 K100RT  Ex- police        
1989 K100LT  Ol' Blue and "Kart" the Kamper trailer.  now KAPUT . 
1993 K1100RS  0194321         Colour #690 Silk Blue  aka " Smurfette"
2018 Kart upgrade.
Another K100 Joins the Shed 10_x_110
    

8Back to top Go down   Another K100 Joins the Shed Empty Re: Another K100 Joins the Shed on Thu Nov 20, 2014 9:49 am

Holister

Holister
Life time member
Life time member
I doubt it's the ECU as that's the one I've had in my bike for the past month or so. Working fine and returned it to Tom last week. I'd be going with Rick's suggestions... plugs, injectors and HT. They're easy to do and the most likely problem imo.


__________________________________________________

1989 K100RT     VIN No.  0097367 (naked)  
1996 K1100RS   VIN No.  0451808
  Another K100 Joins the Shed Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

9Back to top Go down   Another K100 Joins the Shed Empty Re: Another K100 Joins the Shed on Thu Nov 20, 2014 11:02 am

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
When I had the problem with my K100LT I swapped the unit up under the headstock and it solved the problem. I never bothered getting it tested because BMW wanted €75 to do that and I bought one off Motorworks for much less. I actually don't know if it was the unit or the multi pin connection although I did clean them all up to no avail.

The K75 it was the unit under the seat and was the multi pin connection.

As KH has said, plug, injectors, HT and back from there. But in my mind its something that affects all 4 cylinders equally so my take is that its more likely to be further back in the system than an individual plug, lead or coil.

Having had a car go down here last week due to a fuel pressure sensor/regulator [would turn over and splutter but not run] I am wondering could there be an issue with that or a connection to it?


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 102,50 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell No 34,600 miles
    

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