Hi all,
Trying to help out a club member here in the UK. R1200GS 2007.
Symptoms/Actions:
No stored fault codes.
He took it out for a ride on Wednesday; trying to filter in traffic, it was borderline unrideable, not wanting to pull below 3,000 in any gear. In addition, when pulling up it was cutting out after a few seconds, even when fully warm.
I've been doing further investigation, and found that the lambda sensors were showing radically different values; sensor 2 was generally showing low voltage, indicating that cylinder was running very lean. I swapped the two sensors over to check it wasn't a faulty sensor, and it wasn't. Using a little throttle to keep the revs up a bit, it repeatedly stumbled; each time, the voltage dropped on sensor 2.
Swapped the primary coils over; it made no difference, either to the rough running or the difference between the two lambda sensor outputs. I also checked the TPS, which is fine – 0% on closed throttle, immediately registering any movement, and going up to 100%. Just running it on the drive, I got it up to temperature; it would then idle pretty happily at 1,200. I noticed that if I then gave it just a little throttle – enough to take it to 1,500 – it was then very rough, fluctuating to below 1,000 as it came close to stalling. Given more throttle, it seemed okay.
He found a slightly tight exhaust valve clearance, but even after correct adjustment, the bike still runs rough.
The bike has a full Remus exhaust system and no exhaust flap fitted,
Adaptations have been reset.
I have attached his initial .CSV file (M BUCK 1) with limited sensors. The file is a log of – TPS, RPM, injection time, lambda sensors – running it on the drive, including steady idle, steady at 2,00 and above, and the stumbling/rough running between the two.
He also sent me a file with all sensors shown, but it is in XLSX format, which I can't load on the forum.
I still think it could be a faulty Throttle position sensor.
All suggestions gratefully accepted.
Thanks
Mike