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Old 07-31-2012, 09:05 AM   #1
ronandkat OP
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Question regarding low speed stutter buell ulysses

Decided to start another thread.. Previously I had stated my idle was about 900 RPM, whih was said to be too low.
The PO said it was low because it wouldnt idle right at the suggested rpm of 1050-1150 or so.

I Understand this to be true, because under VERY I mean EXTREMELY light throttle application, as in 1/4 of a 1/4, of a 1/4.. (you get the picture) it misses and sputters. If I open the throttle "just enough" to raise the rpms to the 1050 range, it sputters bad, a little more throttle to say 1300 rpm on up, it behaves perfectly. Doesnt really affect my riding much since im rarely in a throttle position that close to closed.. However it has me wondering if maybe the TPS may need reset as its the only thing I could think of? Cant stress enough it runs great and strong every where else.
The PO gave me ECMspy and the connector cabel, I am supposed to be able to use that to reset the TPS.. Does this fit the symptoms? Still not in the know on this bike. Thanks!
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Old 07-31-2012, 10:09 AM   #2
JTucker
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I would reset the tps. Yes you can do it with ecmspy.
Expect the bike to run bad for a few minutes until it relearns.
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Old 07-31-2012, 10:56 AM   #3
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It sure sounds to me like the TPS needs to be reset. There are tutorials everywhere, I used this one and it got me through http://www.youtube.com/watch?v=i33__Qkvhn4

After you reset it, like JTucker said it might run bad right after you do it. Take it for a nice easy 15-20minute steady-speed ride on the highway so the ECM can relearn the zero'd out TPS and it should run much nicer.
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Old 08-01-2012, 01:06 AM   #4
Petrus
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And you might try a breather reroute, that will solve also a lot of low end stutter problems. I did mine 2 years ago or so and never had any problems when starting and driving anymore.
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Old 08-01-2012, 03:40 AM   #5
madeouttaglass
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Don't know what year your bike is, but this may help:
http://www.badweatherbikers.com/buel...tml?1285617127
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Old 08-01-2012, 04:51 AM   #6
ronandkat OP
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Ill have to look at the breather reroute as well. I think I may leave it alone for a month or so and get used to the bike, and its quirks, then maybe look at doing a TPS reset.
The fans on these things, mine comes on as soon as I turn off the key, doe sit ever come on while running?
I mean literally if the fan is running and I turn the switch back on , it cuts off the fan? Is this proper, with the assumption that while its running the oil is circulating and air flowing, but at shut off all of that stops?
Just curious. Longest ride I have been on so far is about 40 minutes, and in all reality I cant tell if the fan runs or not while riding because of noise, etc..

Ahh Some research and the 2010 on up have fans that come on above 12 MPH.. Mines a 2007, does it come on at all while running, even if the temps get high?

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Old 08-01-2012, 07:38 AM   #7
JTucker
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Yes it will come on when running if the engine temp gets high enough. Every time I spend a while at high speed it comes on. It cuts off when you turn the key back on, all the older ones do that. I really don't know why.
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Old 08-01-2012, 12:47 PM   #8
unlucky1
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Quote:
Originally Posted by ronandkat View Post
Ill have to look at the breather reroute as well. I think I may leave it alone for a month or so and get used to the bike, and its quirks, then maybe look at doing a TPS reset.
I'd do it ASAP since you have the software and link cable already. If it's off, your ECM is not fueling the engine properly and the wonky idle at proper speed isn't a quirk, it's out of tune. You'll like riding it a lot more with it set right and it only takes a half hour or so to do.
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Old 08-01-2012, 03:32 PM   #9
Murf2
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I hope you get along with your Uly. I love mine. AFAIK the fans logic differs by year plus there were program "upgrades" from time to time. My 06+ fan will run fairly often while moving in hot weather. My wife's 07 never runs when moving AFAIK but runs longer after when stopped. Rider heat is less on the 06 than on the 07. I believe the 06 fan acts differently now after an ECM "update" than it did when I first got it.

Good Luck

Murf

P.S. Lots of good help here http://badweatherbikers.com/
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Old 08-02-2012, 05:19 AM   #10
ronandkat OP
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Originally Posted by unlucky1 View Post
I'd do it ASAP since you have the software and link cable already. If it's off, your ECM is not fueling the engine properly and the wonky idle at proper speed isn't a quirk, it's out of tune. You'll like riding it a lot more with it set right and it only takes a half hour or so to do.
Does the TPS reset affect the ECM in anyway? Im just worried to do it, because with my luck, it will run worse..L
It really doesn run great pretty much everywhere except that tiny little point.. Its not even really noticable riding, even on city streets in slow traffic I have to actually mkae it happen on order for it to occur.
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Old 08-02-2012, 05:21 AM   #11
ronandkat OP
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Quote:
Originally Posted by Murf2 View Post
I hope you get along with your Uly. I love mine. AFAIK the fans logic differs by year plus there were program "upgrades" from time to time. My 06+ fan will run fairly often while moving in hot weather. My wife's 07 never runs when moving AFAIK but runs longer after when stopped. Rider heat is less on the 06 than on the 07. I believe the 06 fan acts differently now after an ECM "update" than it did when I first got it.

Good Luck

Murf

P.S. Lots of good help here http://badweatherbikers.com/
Murf, I am really enjoying it.. The heat not as much.. But 95 degrees in city traffic is not a fair test.. Its certainly tolerable on the back roads and such.. Maybe Ill wrap the headers.. Thats my only real complaint so far. Dont really want to do the comfort kit.
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Old 08-03-2012, 07:55 AM   #12
unlucky1
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Quote:
Originally Posted by ronandkat View Post
Does the TPS reset affect the ECM in anyway? Im just worried to do it, because with my luck, it will run worse..L
It really doesn run great pretty much everywhere except that tiny little point.. Its not even really noticable riding, even on city streets in slow traffic I have to actually mkae it happen on order for it to occur.
Yes, sort of indirectly. Technical discussion alert!

When you run at a steady speed with light load/throttle, the ECM goes into "learn mode" where it pays attention to the O2 sensor's output. If it's too rich in this state, it leans out the WHOLE map - too lean, it richens the map. Again, the whole map - it has no ability to make fine dynamic adjustments.

So there's that. Then when your TPS is out of wack, it's basically telling your ECM you're at a different throttle position than you really are, and it will fuel it incorrectly. From here, if you're fueling incorrectly the O2 sensor is going to give bogus output to the ECM and the ECM will richen/lean the whole map based on that bogus information. That can cause bucking, rough running, misses, and can even foul plugs over time.
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Old 08-03-2012, 10:55 AM   #13
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The ECM learning only takes place when revs are steady for a period of time (5 minutes?) above 3,000 RPM.

on the fan, people kept complaining about how noisy they were, so a firmware update was put out that between 0 and (i think) 25 mph, the fan is off, above that it should be running as necessary but everything else is too loud to hear it. so if you're putting around town, the rear head gets really hot, and when you shut off the bike, it turns the fan on HIGH.
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Old 08-03-2012, 11:13 AM   #14
ronandkat OP
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Originally Posted by unlucky1 View Post
Yes, sort of indirectly. Technical discussion alert!

When you run at a steady speed with light load/throttle, the ECM goes into "learn mode" where it pays attention to the O2 sensor's output. If it's too rich in this state, it leans out the WHOLE map - too lean, it richens the map. Again, the whole map - it has no ability to make fine dynamic adjustments.

So there's that. Then when your TPS is out of wack, it's basically telling your ECM you're at a different throttle position than you really are, and it will fuel it incorrectly. From here, if you're fueling incorrectly the O2 sensor is going to give bogus output to the ECM and the ECM will richen/lean the whole map based on that bogus information. That can cause bucking, rough running, misses, and can even foul plugs over time.
Based on this, its sounds like id need to do a reset every time I got on the highway for more than 5 minutes at a time? If Im understanding it correctly?

Ill see about learning this software and maybe doing a reset this weekend, if for nothing else, just to learn the process.

I know the previous owner went on a 1200 mile round trip ride to NH with no issues 2 weeks before I bought the bike.
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Old 08-03-2012, 11:32 AM   #15
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Not every time you ride it. Normal throttle cable stretch will put it off over time. Maybe like once a season or if it's exhibiting symptoms of an off-TPS (like you're seeing) or before every time you make adjustments to the fuel mapping (so that you don't map it off).

I used this tutorial to do mine http://www.youtube.com/watch?v=i33__Qkvhn4
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