| Author | Message | ||
     Lovematt |
Hello guys and gals, I have recently had something occur where I am slowing down to a stop and once I am stopped, the throttle doesn't respond momentarily. It does not seem to matter how long the bike has been ridden but when I am stopped and ready to take off again, turning the throttle has no response for a few seconds...I mean like a 1/8 of a turn after the throttle cables are tight. The bike does not seem to want to die or stop running...it just won't come up in revs. I had the TPS reset about 3000 miles ago and didn't have a problem until a couple of days ago. The idle has been sticking a little bit where it stays at 2000 so I have been lowering the idle slightly the last few days as it is warranted. Otherwise the bike runs great...it only does this from a stop or at idle and there is no consistent patter at this point. I am thinking possibly TPS Reset is needed again or could the slightly high idle cause this? Oh yeah this is a 2003 XB9R with K&N, 12 Airbox, DRUMMER, and stock ECM (soon to be Race ECM). (Message edited by lovematt on March 10, 2005) | ||
| Glitch |
I am thinking possibly TPS Reset is needed again or could the slightly high idle cause this? I'm not thinkin' it's in need of a TPS reset, but we all know the idle is a bit touchy. After the bike is fully warmed up, check and adjust your idle. Also make sure all cables leading to and from your throttle are nice, and where they should be. Then if it's still a mystery check the TPS. I've forgotten something I'm sure... | ||
| M1combat |
Are you rolling on the throttle mildly or just whacking it open abruptly? | ||
| Lovematt |
When I check the idle I ride for at least 15-20 minutes, stop, let it idle for about a minute, then adjust it. I am rolling the throttle slowly...like if I were to open the throttle all the way it would take at least a second. I never quickly open the throttle...that is not good from what my mechanic tells me (won't hurt the bike but it is not a good idea). The one time I tried it (so I know what it does to recognize it) the bike was "unsettled" for a few seconds...kind of disrupted itself and then sorted itself out after about 5-10 seconds. Overall I tend to be very smooth with the throttle....several track days and high speed turning has taught me this is the best thing. | ||
| Ingemar |
So you are in a gear, closed throttle slowing down on the engine, right? What happens in that situation is that while the revs are above a certain rpm range, there is no fuel delivered to the engine. If the revs get below that range it starts the fuel injection again. This is a basic knowledge for fuel injected engines, I'm not sure how Buell has implemented it but I'd be damned if they did not do that. What you can try is pull the clutch while closing the throttle before coming to a stop, let it idle and use your brakes. Then coming to a stop, put it in neutral and after a few secs, try revving it. See what happens. That way fuel injection continues to flow and is not interupted while you slow down. Now if your bike then revs normally, it might be the fuel pump or the control thereof. I dunno really, just a guess. Keep us posted oke? I'm very interested to see what might be causing this. | ||
| Lovematt |
Ingemar, I see...this is my first fuel injection vehicle...ever. That makes sense...if the bike is at an above idle RPM, there is no throttle input, and the computer shuts off/slows down fuel flow to bring the bike's RPM down. I think it is the idle...yesterday it hung at about 2500 "sometimes" when coming down from speed with no throttle...pulled in the clutch and it took about 3-4 seconds to start coming back down to idle. Adjusted it down and today it hung at about 1800 and I just adjusted it down again (not a lower RPM...set to 1050 RPM). Hopefully later today will make this problem go away. Thanks for that info on how fuel injection works in that situation. Looks like I have another research project to do...I like learning about stuff I don't know so that I understand it better. | ||
| M1combat |
My idle is set JUST under 1000... I find it works best about there, and it's only JUST above 1000 when the bike is very warm from being ridden hard. | ||
| Ingemar |
The idle is an experiment. Mine bounces between 1000-1050. Never over. Setting a 9 below 1000 never worked for me but maybe this differs per bike. My idle has been off in both directions but I have never experienced Lovematt's problem. Not to say that the idle is not the cause of the problem, just saying I haven't heard about it or experienced it myself so far. Interesting stuff ... M1, normally the idle is set lower than that on a 12, right? | ||
| M1combat |
I think both manuals call for a 1050 idle... I could be wrong  . | ||
| Jerseyguy |
If the idle is just a bit too high, like 1150 or more, my 9 will hang at 2000 or so for quite a while then meander its way back down to idle speed. It could take maybe 5 seconds. If the idle is set at 1000 to 1100 then it will drop right back to idle when the throttle is closed. Its pretty finicky about the idle setting. | ||
| Kowpow225 |
Hmm.... I'm wingin' it here but I think a TPS adjustment will cure it. I think, essentially, that your TPS is so far out of whack, the ECM doesn't recognize the throttle being open until your close to that 1/8 turn mark. Then it gets sent a value from the tps. | ||
| Lovematt |
But the thing is this is not a consistent thing. The bike runs beautifully under a load...even in first gear and rolling the throttle about the same. This only happens with the clutch in and the RPMs about 1100-1200 and starting to throttle. I have been setting my idle so it kisses 1100 once in a while....might be too high still. I will set it right at 1000 tonight after riding for a while and see if that does it. Odd I just had the TPS Reset just about a month ago though...maybe I will have them do it again and explain it needs to be done RIGHT in about a month or so (racking up the miles ever since I got my DRUMMER!). | ||
| Lovematt |
I think I will get the TPS reset anyways and explain the situation (again) to see what happens. I need to bring it in for something in about a month when I get back from some business trips. Come to think about it I will need to do that anyways since I will be putting in the Race ECM at that time. (Message edited by lovematt on March 11, 2005) | ||
| Lovematt |
I set my idle a bit lower so the "average" is about 1000...it dances above and below that tickmark pretty regularly. I had it dancing around the 1050-1100 mark before. This seems to have been the problem...it has been happening since I got the Drummer and I guess with the increased airflow the idle doesn't need to be quite as high. I actually tried to mess with the throttle a bit to make the problem occur and since the idle is coming down faster I can't get it to do it anymore. COOL! | ||
| Jerseyguy |
Sweet! I love it when a plan comes together. | ||
| Lovematt |
Jerseyguy, You were absolutely right about the Drummer...it is everything I could hope for and more. Absolutely amazing how much simply changing one component did for the performance of my bike. | ||
| Ingemar |
Cool. Good thing you got it resolved. | ||
| Hkwan |
So to solve it, you just lowered the idle? |
