General Category > Engine related issues
Poor engine performance - 2011 R1200GS
ErnieA:
Hello fellow enthusiasts:
I'm helping a friend with his 2011 R1200 GS. We are trying to get the engine performance back to a ride worthy state. We are perplexed, and perhaps you might have some ideas for us. There are a few posts here that are very similar, but there is no conclusions drawn from your suggestions. This seems the case in many forums, especially when the bike is finally sent into the dealer for repair. However this bike has a complex issue and there must be others that have had the same, so here goes:
The owner first noticed a problem 3 years ago on a trip to Alaska where he thought he bought bad fuel, however the riding partner pumped from the same station without problems. The symptoms were poor idling and backfire under load at slow speed and went away for the most part at higher speed. He added "Seafoam" to the gas and things seemed to improve over time.
The second time the symptom cropped up was after a fuel pump "service bulletin" came out and BMW requested he bring it in and have it changed out. While the bike was in the shop for the Fuel pump R&R they updated the software and changed the plugs (at about 50k miles). They told him they were fouled and that they flushed the tank and fuel lines. Performance was better for awhile but has steadily decreasing.
He embarked on a cross-country trip last summer he experienced the same problems as before and started the "Seafoam" treatment again with similar results, and made it home. And again this summer on a long trip he started getting symptoms that were worse to the point it the bike is unsafe to ride. The bike bucks and backfires. There is no low end power and the smell of raw fuel is evident from the muffler. The Cat is full of fuel and gets red hot and barks from the after-burn.
He, and a mutual friend started using the internet forums to try to fix it. They did the following up to the point I looked at it and hooked up my GS911:
* They replaced the spark plugs which were soot fouled
* They replaced the upper stick coils
* They followed the TPS reset procedure that is widely used (disconnect the battery, reconnect, twist throttle 3 times, etc
They could get the bike to idle smoothly and it looked good until he took it for a ride and about 1/2 mile later all of the symptoms were back.
We hooked it up to the GS911 and the bike, hardly running at idle, showed the O2 sensors throwing a constant 1+ volt and I thought it would be strange if both were bad at the same time. We tried the TPS reset and reset the stepper valves. We re-synced the cables using a manometer. The bike started right up and all was smooth and sweet! We rechecked the O2 sensors and they were all over the place. We called our local shop and there are none in the US (supposedly) and we went on the hunt for some locally sourced ones. WE found some Nipon Denso that fit and converted the wiring. The bike again started right up and the O2 sensors were operating as they should.
I took the bike for a test ride and I didn't make it a 1/4 mile and all of the symptoms returned. This is with fresh fuel and a cleaned air fllter too. I'm guessing I can try the TPS reset again and I'm going to find it doing the same thing over again for the 3rd time.
What would make it run so well stationary but once you run up the speed to +20 MPH the engine wants to dump raw fuel into it like you are at full throttle? Why is it doing this? Anyone have a clue?
Open to any ideas...
Thank you in advance,
Ernie Azevedo
Milwaukie Oregon
503-799-4026
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ErnieA:
Attached is the original auto-scan for the R1200GS I'm working on. Any help is appreciated.
schuppi:
Hello Ernie
Thank you for posting complete records :)
If you look for "engine load", it only displayed negativ datas.
So I think there is something wrong with the TPS sensor.
Hope to show you a way for troubleshooting
ErnieA:
--- Quote from: schuppi on October 12, 2016, 01:33:01 PM ---Hello Ernie
Thank you for posting complete records :)
If you look for "engine load", it only displayed negativ datas.
So I think there is something wrong with the TPS sensor.
Hope to show you a way for troubleshooting
--- End quote ---
I appreciate you responding. My friend and I are totally perplexed at the situation. I wish we had a list of appropriate values to compare to the readings, but that is a big wish. We decided to take it into the dealer and tell them what we have done so far and have them diagnose it then repair it. Hopefully they will disclose all of their findings. I will report back what the conclusions happen to be. The bike has not had any computer updates for 2 years anyway. So it is probably a good thing to have them look at it.
Thank you again!
Ernie Azevedo
Milwaukie, Oregon (USA)
schuppi:
Hi Ernie
here are the sampled datas from my R1200GS, just to compare :) 8)
RPM (TPS) Engine load
0 0,1 00:00 Ignition on
0 0,1 00:00
0 0,1 00:00
0 0,1 00:00
0 0,1 00:00
0 0,1 00:00
0 0,1 00:00
0 0,1 00:00
0 0,1 45,62 starting the engine
0 0,1 45,62
0 0,1 45,62
0 0,1 45,62
1490 0,1 00:00 engine at idle
1341 0,1 14,23
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