| Author |
Message |
    
Saltlick
| | Posted on Friday, April 16, 2010 - 05:28 pm: | 
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2003 XB9S once bike warms fully up, at stoplights RPM's will go crazy go up and down up and down by 500, if i give it the gas when its doing that the bike will bog out and die. If i sit there long enough it will eventually settle down to 1050 then i take off no problem. This is not a hanging throttle issue....this is RPM's going up when im in idle on thier own.
Ive done a TPS reset 3 times now, it will cure the problem for a few hours then it slowly creeps back.
This is driving me nuts. Anyone? |
Terrys1980
| | Posted on Friday, April 16, 2010 - 05:32 pm: |
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You might have your TPS set too high. Try lowering it and see if it stabilizes. |
Buellisticx1
| | Posted on Friday, April 16, 2010 - 05:58 pm: |
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I had exactly the same symptoms on my X1 for a long time and turned out be my intake seals were stiff and wear. I replaced them and solved.
I would test for intake manifold seal leaks.
it isn't uncommon for the leak to get worse as the engine warms up, the cylinders get taller, and tug on the manifold more than when cold. Check it by spraying stuff at the manifold/head joint once the problem starts.
You must to check an intake leak after the engine is thoroughly warmed up and hear/look if there is any significant change in idle.
That was mine, yours may be different.
Good luck and let us know the solution.
Regards. |
Blake
| | Posted on Friday, April 16, 2010 - 06:14 pm: |
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"You might have your TPS set too high. Try lowering it and see if it stabilizes."
Are you meaning that the TPS voltage at idle may be too high? |
Terrys1980
| | Posted on Friday, April 16, 2010 - 06:31 pm: |
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What I meant was try lowering the idle some. I have had problems with the idle climbing to 2k then dropping after a TPS reset. |
Saltlick
| | Posted on Friday, April 16, 2010 - 06:49 pm: |
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i tried lowering it to 900, no luck. Well, as much as i feared its probably the intake seals. I ordered the blue ones just in case a week ago. I tried the intake leak test but got no results but it wasnt completely warmed up. Ill try it again before i replace them, thanks guys. |
Buellisticx1
| | Posted on Saturday, April 17, 2010 - 03:18 am: |
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Good choice, I also put James blue ones.
Regards. |
Saltlick
| | Posted on Saturday, April 17, 2010 - 08:34 am: |
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I am going to take it to D&S cycle to have them replace the manifold seals, you guys think he can handle it? Ive had good work by them in the past, curious if they know how to work on buells. I sure dont. |
Saltlick
| | Posted on Saturday, April 17, 2010 - 06:54 pm: |
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Well this was all an intake leak. Took it to D&S cycle, he sprayed some carb cleaner in the intake by the seals and it killed the bike right away. Going to have it fixed next week. I am happy about that, at least i found the problem. |
Saltlick
| | Posted on Thursday, April 22, 2010 - 12:14 am: |
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All i can do is laugh.. Replaced the intake seals.. Problem is still there. So it did have an intake leak, the test proved it but that wasnt the problem? Ha ha ha okay so ive done three tps resets, replaced the seals, lubed up the throttle cables, adjusted the idle up and down. In the 9 months ive had this bike ive spent alot of money and time fixing it, i sure would like to actually ride it. Anyone have any other ideas what would cause this? Im ready to drive this thing off a cliff. |
Saltlick
| | Posted on Thursday, April 22, 2010 - 12:30 am: |
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Im almost on empty and fuel dripped out of my overflow tube after shutting off the bike today, is that related? |
Id073897
| | Posted on Thursday, April 22, 2010 - 01:35 am: |
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Problem is still there.
Adjust fuel.
Adjust spark advance. |
Kalali
| | Posted on Thursday, April 22, 2010 - 11:04 am: |
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This may sound strange but did you check for intake leaks after they were replaced? I have seen/heard a number of cases where the seals were improperly installed and in fact made the leak worse. Did you also "visually" verify that the throttle butterfly was fully closed when you did a TPS reset? If both of these items are rued out, then I'd say you may have either a bad intake temp or engine temp sensor. I believe there are test procedures in the FSM for those, e.g., check resistance change vs. temperature change, etc. There has also been cases where the ECM was malfunctioning...All in all, you need to go through a process of elimination..And you probably already knew that...Sorry.. Maybe someone else can chime in and help you out. Keep us posted. |
Buellisticx1
| | Posted on Thursday, April 22, 2010 - 02:36 pm: |
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Are you running with a Race ECM or a Race Eeprom loaded in the original ECM? .....
I know of cases of guys who did a load of Race Eeprom in its original ECM and had the same symptoms as yours.... |
Saltlick
| | Posted on Thursday, April 22, 2010 - 03:35 pm: |
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I had the seals replaced by a local shop, he has never worked on a buell's intake seals but has done many harleys. Hmmm. I suppose another leak test is in order. He never mentioned if he retested it after he replaced the seals. It seemed like once it was warmed up the problem was worse than before but it could have been in my mind. One question, if there is still a leak from improper installation is it on thier dime to replace them again? I would think so, just checking. |
Saltlick
| | Posted on Friday, April 23, 2010 - 01:51 pm: |
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Well i found the problem. It did have an intake leak and that was fixed by the shop but that wasnt the problem. In the end all i had to do was clean off the intake air sensor. It had oil on it and was slightly bent sideways. I straightened it out, cleaned it with soap and water and it runs like new again! just in time for the nice weekend.
Man its awesome when you find out its something simple and you fix it yourself.
(Message edited by saltlick on April 23, 2010) |
Froggy
| | Posted on Friday, April 23, 2010 - 02:27 pm: |
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Don't you love it when its something so stupid?  |
Blake
| | Posted on Friday, April 23, 2010 - 02:39 pm: |
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I used to have to clean the IAT sensor in our Ford Exploder every Springtime after tree polen season. It would start to ping as it became coated with polen, causing a false increase in sensed intake air temperature. |
Kalali
| | Posted on Friday, April 23, 2010 - 02:44 pm: |
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Glad you found the culprit. Based on my experience in the FI bikes, if the engine speed starts fluctuating as it gets warmed up, the problem is either leaky intake seals, faulty engine temp sensor or dirty air intake sensor. I don't think I've heard of a case when the IAT actually went bad but it gets oily specially if your breather lines are routed back into the intake. |
Aptbldr
| | Posted on Friday, April 23, 2010 - 05:46 pm: |
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And, here's the beef!
Thanks for thread, Salty. |
Sparky
| | Posted on Sunday, April 25, 2010 - 09:33 pm: |
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So, you guys seem to think that the IAT sensor may become allergic to pollen and other airborne contaminants that evidently result in coughing, stuttering and poor performance with the right hand supposedly in control of the satisfaction parameter?  LOL, you guys crack me up!, jk, but you may be on to something... |
Id073897
| | Posted on Monday, April 26, 2010 - 02:03 am: |
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A dust covered IAT will never give a false reading, it will only be delayed when temperatures change. |
Sparky
| | Posted on Monday, April 26, 2010 - 02:19 pm: |
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Id, so you're saying that dust or other contaminant covering an IAT sensor doesn't change the electrical characteristics of the sensor but such contaminants can change the physical response to the environment?
That makes perfect sense. Think of a hand inside of an insulated glove on a winter ride. You don't feel the cold right away because of the insulation around the hand inside the glove. Eventually you may feel the cold but the cold response is delayed because of the insulation provided by the glove (dirt/contamination on the IAT sensor).
Bottom line - for better throttle response, keep your IAT sensor clean! |
Fordhotline
| | Posted on Saturday, September 01, 2012 - 10:24 am: |
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Anyone see this problem on a Uly yet? |
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Troubleshooting (Poor Starting/Running/Handling/Ride Issues) »
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Anyone know what would make my RPM's increase at idle?