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Old 04-25-2015, 07:08 AM   #1
peecis OP
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Location: Riga, Latvia
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Engine shuts off in some seconds after start. (BMW R1100S)

Hello dear boxer specialists!

Last autumn I was riding the bike (bmw r1100s, 2000.) when in light traffic jam the engine suddenly stopped and after starting it run only for some seconds. I took it home on trailer and discovered how nice thing bicycle is



I hoped that during winter bike will rest and fix himself or Santa will fix it, but he didn't and I have to fix it. I have no idea about cause of the problem. My first idea was fuel pump, but, as it turns off in some seconds after turning ignition on, pressure should be ok. Tried switching choke and result is the same. With one cylinder off it runs same time, that makes me think that productivity of fuel pump also is ok.
Any ideas?
Here is how bike works with choke off, last time I tried to run it was 3 weeks ago.

https://youtu.be/-fmCdC2_mc4

Any ideas?
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Old 04-25-2015, 10:47 AM   #2
ragtoplvr
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This sounds like a plugged fuel filter, split line in the tank etc.

Oh and your battery needs charged too.

Off with the tank. If you have not yet, ALL the fuel lines and quick disconnects are due for a change. Be sure to mark well take picture how the fuel plate is located.

On this site in small letters at the bottom right side you see Hall of Wisdom. Click on that and look at all the help there.

Rod
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Old 04-25-2015, 12:48 PM   #3
Zoef zoef
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Have you tried it since then? Could also be HES acting up.
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Old 04-25-2015, 04:08 PM   #4
peecis OP
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Quote:
Originally Posted by Zoef zoef View Post
Have you tried it since then? Could also be HES acting up.
Yes, I made this video today, nothing has changed. HES affects starting too, but engine starts normaly.
I don't think that filter can get cloged suddenly, but I'll replace it anyway.
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Old 04-25-2015, 07:20 PM   #5
roger 04 rt
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Rather than just guessing, measure the amount of fuel returning to the tank from the pressure regulator. It should be 2 liters per minute at idle or with the pump on but engine not running. If it is, your in tank is fine. If no return flow or just a little, that is your problem.
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Old 04-25-2015, 09:55 PM   #6
Dan Căta
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When was the last time you cleaned the passages for the idle air flow on the TB's? Try that first, it is easy and you will need to do it anyway.

Next thing is to replace the fuel filter and it would not hurt to give the injectors an ultrasound cleaning, they also get measured in the process and the guy doing this can tell you the condition if the injectors.

Dan.
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Old 04-27-2015, 08:41 AM   #7
peecis OP
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Thanks for ideas, I'll inform about results.

throttle body idle air flow passages I have never cleaned, will start with that :)

Somehow in maintenance recommendations I haven't seen about that, thanks!
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Old 05-24-2015, 06:09 AM   #8
peecis OP
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Cleaned those idle passage brass screws, there were some oil/carbon buildup, cleaned those screws, is it good idea to blow carb cleaner spray in there?
Everything in fuel tank seemed fine, tested fuel pump productivity without load - 2 liters per minute.
Probably I have to test fuel pressure valve.

Now I have motivation to fix bike - my GF honda is already running
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Old 05-24-2015, 06:17 AM   #9
JetSpeed
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Take the cover off and check the HES, sometimes they can come loose, or it may be faulty, it is likely that this is where your problem lies though.
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Old 05-24-2015, 07:54 AM   #10
roger 04 rt
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Quote:
Originally Posted by peecis View Post
Cleaned those idle passage brass screws, there were some oil/carbon buildup, cleaned those screws, is it good idea to blow carb cleaner spray in there?
Everything in fuel tank seemed fine, tested fuel pump productivity without load - 2 liters per minute.
Probably I have to test fuel pressure valve.

Now I have motivation to fix bike - my GF honda is already running
Did you check the fuel returning back to the tank at idle, or did you measure the fuel coming from the tank? It makes a huge difference.

Measure the fuel going from the fuel distributor back to the tank. That way you have the fuel under pressure before the fuel pressure regulator. That will tell you if you have split hoses.
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Old 05-26-2015, 06:02 AM   #11
MotoJim
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Make sure the tank is ventilating properly. If after the bike runs and stops open the fuel cap and see if there is a swoosh with the air filling a vacuum condition.
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Old 05-26-2015, 04:49 PM   #12
Callisto224
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Quote:
Originally Posted by MotoJim View Post
Make sure the tank is ventilating properly. If after the bike runs and stops open the fuel cap and see if there is a swoosh with the air filling a vacuum condition.
^^ this.

I've had the vent lines plugged on my 2009 12GS by spiders and insects getting in there. It was still under warranty so I took it to the shop and they blew out the lines with air. Fixed the problem. They also said it's quite common.
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Old 05-26-2015, 05:10 PM   #13
def
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Quote:
Originally Posted by peecis View Post
Cleaned those idle passage brass screws, there were some oil/carbon buildup, cleaned those screws, is it good idea to blow carb cleaner spray in there?
Everything in fuel tank seemed fine, tested fuel pump productivity without load - 2 liters per minute.
Probably I have to test fuel pressure valve.

Now I have motivation to fix bike - my GF honda is already running
Spray of carb cleaner does no harm. Engine off, remove BBIABPSs, shoot some carb cleaner, not much, allow to sit, clean BBIABPSs with carb cleaner, wipe clean, install, start engine, evaluate work, report.
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