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   Fuel injection problems Empty Fuel injection problems Tue Jun 07, 2016 9:08 am

comedysidekick

comedysidekick
New member
New member
Just joined here yesterday so feel a bit guilty about asking for advice already but here we go as I'm just hitting me head against a wall right now...well it feels like it...

I've an '84 k100 that I bought as a part project and supposedly a runner....wish I'd checked first. Anyway,  I digress, after sorting out what I thought was the problems for it not starting, a k75 broken fuel pump now replaced with a new proper k100 pump, replaced filters, cleaned out the fuel return line as the one way valve going into the tank was rusted shut. How rust got into the aluminium tank I'm not sure but there it was. Checked the injectors and they're good, charged up the battery, hit the starter and....and the fuel pump works, the engine turns over, then every now and again it runs but literally a second later it cuts out completely. Put the choke on and it just turns over without even trying to start. Had the plugs out and they spark lovely, took the injector rail off with the injectors in situ to see if it's delivering petrol ok and here lies the problem, if I hit the starter button then release it a second or two later the injectors squirt nicely once but that's it, hence starting but cutting out straight away, however if I keep my finger on the starter button they don't work at all. 
I've worked on a few bikes over the years but never a bmw or a bike with fuel injection so my head is totally baffled as to what this might be.
If anyone could point me in the right direction of what to check I'd be really grateful or if you've had a similar problem then I'd really love to hear about what it was. 
Many thanks, paul.

    

2Back to top Go down   Fuel injection problems Empty Re: Fuel injection problems Tue Jun 07, 2016 10:10 am

charlie99

charlie99
VIP
VIP
under seat computer plug come apart slightly ?


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

3Back to top Go down   Fuel injection problems Empty Re: Fuel injection problems Tue Jun 07, 2016 10:43 am

Rick G

Rick G
admin
admin
Once you release the start button the pump will only run for 1.5 seconds unless the computer is getting a signal from the ignition sensors. If you hold the start button down the injectors will or should fire at every revolution of the engine.
The choke is only a fast idle and does not enrich the mixture the ECU does that if necessary according to ambient temperature.
Check the fuel pressure regulator is working correctly, we have seen a few fail recently.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

Sponsored content


    

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