General Category > Engine related issues

Why No Fault/Trouble Codes Set?

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AlaGS:
Thanks to all for your input. It's been another long while… My BMW shop still has the bike! (12 weeks) Both BMW and hence my shop have given up on the repair. The last thing they did at BMW's direction was to try to replace the 'timing pin on the cam gear which they had to order special tool and new pin to do. Currently waiting on new pin and tool. When they get it back together and running at least as good as it was when I brought it in, I will bring it home. My plan is to make fixing it my summer project. I am sure I can with the help of our BMW community of pretty good mechanics. With our collective brains, experience and my trusty GS911 I know there is a fix. After all, it's just a gasoline fueled, spark ignited, 4 stroke, internal combustion engine. More to come.

Jughead:
Your problem sound typical of a main stick coil failure.

On these bikes, all 4 plugs fire at low rpm and low engine load.  As soon as the rpm is increased, engine is loaded and has to work hard, the lower coils stop firing.

Thus, if you have a dead main coil on say cylinder 1, at low rpm the lower coil of cylinder 1 will be firing and both will be firing on cylinder 2.

Increase the load and both lower coils stop firing, leaving you with only the main coil on cylinder 2.

AlaGS:
Sorry for the late reply but I've been riding motorcycles for the last month :) I want you to know that you were exactly correct! We found the primary coil on true #2 (left) cylinder bad. Replaced it and she ran like new! I have learned a lot during this troubleshooting process and understand a lot more about how the ECMs on the BMWs work.  It will be a cold lonely day before I take a bike bake to a BMW dealer again. I told them what to check and they still charged me an unreasonable amount…

Thank you for the input I just wish I had it sooner! (No fault of yours of course…)

Thanks Again

AlaGS

Jughead:
 ;D

Pleased I could assist.

FWIW, I visited a BMW dealership workshop recently where the "mechanic" told me that he was not really a mechanic.  He just plugged the bike into the computer and did whatever it told him to.  He didn't actually know how to repair anything on the bike.  They were only taught how to replace what was defective.

Unfortunately that means that if the computer cannot pick up the problem (like when it is something mechanical) they are completely stumped.

WayneC:
Yes and I discovered the Dealer "guided Troubleshooting" is just a standard form and the same on each model, what I saw was hopeless

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