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-   BMW R1100S / R1200S Tech Forum (http://forums.pelicanparts.com/bmw-r1100s-r1200s-tech-forum/)
-   -   Cut black wire, runs worse (http://forums.pelicanparts.com/bmw-r1100s-r1200s-tech-forum/352924-cut-black-wire-runs-worse.html)

wcmach 06-19-2007 03:17 PM

Cut black wire, runs worse
 
I cut the black wire on the O2 sensor because of what I had read about the computer using the sensor to lean the mixture at steady throttle. What I found is that it starts to surge and buck at steady throttle on the highway. I have reconnected it an all seems fine again. It is possible that a chip was installed by the previous owner and that's whats causing the problem. I purchased my 2004 BCR from a dealer used with the Ztecnic exhaust already installed and got no info about weather a chip was installed and have not taken it apart to see. I really runs well the way it is but I like to play around.

JonyRR 06-19-2007 03:26 PM

disconnect the 02 sensor under the tank.
Pull the CCP (cat code plug)
when the CCP is yanked and the 02 sensor disconnected, the CPU runs strictly off the mapped chip.
do a search for '0=0' tps adjust and follow accordingly.

fred gassit 06-24-2007 06:23 AM

I am new to this site, having just purchased a 2001 R1100RS with 5000 real miles. It surges terribly at all throttle opening, need help to sort out what the problem is......
It still has the cannister mounted on the side under the bags but I have no clue as to whether anything is connected or disconnected.
I am moderately mechanically minded and dont mind having a go at something, if someone can give me some direction PLEASE....
Thanks
Fred Gassit

roger albert 06-24-2007 06:31 AM

Jesus.

Why would leaning the mixture at steady state be a problem or a bad thing? Just not able to burn enough gas to keep your wallet thin enough to sit on? The problem is not some chip, but rather the horrible hack on the harness. If it runs really well, then leave it be, and find something else to do your tinkering on if you must. (maintenance, suspension etc etc)

As for the surging, there are many many many threads on the board. Search the archives and there will be all you ever wanted to know.

island_dude 06-24-2007 06:45 AM

I too have been fighting a problem with rough running. This is something that started back in Nov last year. There were a couple of major issues to deal with. As it turned out, my throttle cables were shot and I had a bad throttle body on the left side. Even after these problems were resolved, there were still problems. The throttle body syncs would not hold for more than a couple of days, and there was/is a persistent buzz or vibration to deal with. They managed to improve this problem considerably. The main thing that they did was reset the computer a few times while "training" it to run properly. The maps are adaptive and changing anything big will throw it into a state. The rough running problem is still there on occasion, but under most circumstances, it runs fine.

Its possible that the computer reset option could make a difference for you as well. I should note that I had a 99 that had zero surge ever. I even tried to find a way to make it surge, but could not. It seems that some bikes surge, and others don't. I am sure there are others here who might have a good explanation for this, but it would not be me.

wcmach 06-25-2007 02:30 AM

Quote:

Originally posted by roger albert
Jesus.

Why would leaning the mixture at steady state be a problem or a bad thing? Just not able to burn enough gas to keep your wallet thin enough to sit on? The problem is not some chip, but rather the horrible hack on the harness. If it runs really well, then leave it be, and find something else to do your tinkering on if you must. (maintenance, suspension etc etc)

As for the surging, there are many many many threads on the board. Search the archives and there will be all you ever wanted to know.

WOW, with the reaming you just gave me , I think I'll be able to fit my wallet up my ass now.http://www.pelicanparts.com/support/...s/pukeface.gif

ckcarr 06-25-2007 03:48 AM

http://www.pelicanparts.com/support/smileys/drummer.gif

Ba-da-boom!

jduke 06-25-2007 05:17 AM

http://www.ibmwr.org/r-tech/oilheads/index.shtml
This site will show you how to do just about all the minor maintenace work you need to do.

roger albert 06-25-2007 06:34 AM

Sorry,

Just blindly chomping wires w/o at all understanding what you're doing or what to expect is just beyond comprehension to me.
Wasn't meant to be a reaming. The good thing is that you got it reversed/fixed. Not something all can manage. Jduke's link above should help you the rest of the way. It's good info. Good luck.

wcmach 06-25-2007 12:36 PM

Quote:

Originally posted by roger albert
Sorry,

Just blindly chomping wires w/o at all understanding what you're doing or what to expect is just beyond comprehension to me.
Wasn't meant to be a reaming. The good thing is that you got it reversed/fixed. Not something all can manage. Jduke's link above should help you the rest of the way. It's good info. Good luck.

No problem, Not exactly "Just blindly chomping wires w/o at all understanding" I did actually do some reading on the subject and have a good understanding of the reason for disconnecting the black wire, thought I would give it a try. I only did the cutting knowing I could put it back the way it was.


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