| Author | Message | ||
     Rkutzner |
This has happened to me twice, not a big issue but if I'm riding on a hot day and I stop for 10-20 minutes (ROUGH estimate) it won't start and if it does it's very rough running. If I let it sit for a half hour or stop for something quick like gas, no problem. I ride to work mostly so this doesn't happen much but in the summer I can't take it for quick errands for fear this will happen ! ANY IDEAS ? I thought vapor lock but once I tried to ride it and run it and after 5 minutes of very rough running it never cleared out...... (Message edited by rkutzner on July 11, 2009) | ||
| Akbuell |
First guess would be that the engine temp sensor is going out of calibration, or the wire from it is rubbing or chafing somewhere. And remember, this guess is worth exactly what you paid for it, LOL!! It would seem this is an issue that should be easy to duplicate, so you really should consider using the warranty. Please let us know what you find. Dave | ||
| Fullcircle |
Leaking fuel injector could cause the same type of thing. | ||
| Rkutzner |
Those are interesting ideas, I definitely can check out the temp sensor wires. Thing is, it's only happened twice and on hot days after making not so quick stops of around 15 minutes. I went to Arbys the one day, got a burger and drink and then went out and she started. That's why I thought vapor lock. Maybe it is and gets the computer all screwy to where it won't recover. | ||
| Kowpow225 |
I'd take a look at your battery/charging system as well especially if it is a few years old. Heat can destroy a battery very quickly. | ||
| Rkutzner |
It actually cranks strong and pretty long, it's just that it won't start and idle easy without touching the throttle. If I force it with a little throttle it will fire up but run real rough and stall easy. | ||
| Hoverjocki |
Been having the same problem with mine....sitting here in Vegas at over 105 now, fires up good most of the time then go to start again and it runs for about 30 sec and dies...start it up again and run the throttle a little and its good. There was talk on another forum about starting it on the stand might do that but not sure about that myself. Been told that high temps might bring this on plus i have had mine re-mapped a couple of times with •••••• so not sure if that has something to do with it too. | ||
| Rkutzner |
When it runs does it run good ? Mine runs real bad and it's an effort to keep it going. After about 30 minutes it starts smooth like nothing happened and runs like a TOP ! | ||
| Metalstorm |
Plugged tank vent tube? Stuck vent pressure valve? | ||
| Mickd |
Leaking fuel injector could cause the same type of thing. I agree. Sounds like a leaking injector. | ||
| Rkutzner |
So in the injector scenario, the injector leaks out the pressure after I turn the bike off and this floods that cylinder, right? Or is it messing up a sensor with the wet feul? After it starts and runs a couple seconds wouldn't everything clear up just like when you flood a dirt bike or car? Does this condition mess the computer up in some way that it keeps running bad even after a few minutes? That's the part I don't get. My last tankful I got 56 mpg, so I'd say it's running really efficiently. Might I be able to see stains in the throttle tube if it's leaking? Just trying to understand, I've got many years experience with everything mechanical but this has me stumped, like there's one thing in each theory that just doesn't add up ! | ||
| Sifo |
Any mods done to your bike? I get a bit of stumble when I restart after 15-20 minutes down time since I put the baffle into my Jardine can. I had everything dialed in but the baffle changed things quite a bit. I've got the basic fuel mapping dialed in again, I just haven't gotten to playing with the cold start enrichment yet. My stumbling is pretty minor and goes away pretty fast though. I have my doubts that this is your problem, but who knows? Are you set up to do some data logging with ECMSpy? It might give some hints as to what's going on. If it's still stock and in warranty then get started with the dealer. At least get the problem documented while it's under warranty. Who knows, there may be an ECM reflash that will fix the problem. | ||
| Mickd |
So in the injector scenario, the injector leaks out the pressure after I turn the bike off and this floods that cylinder, right? Or is it messing up a sensor with the wet feul? After it starts and runs a couple seconds wouldn't everything clear up just like when you flood a dirt bike or car? Does this condition mess the computer up in some way that it keeps running bad even after a few minutes? That's the part I don't get. My last tankful I got 56 mpg, so I'd say it's running really efficiently. Might I be able to see stains in the throttle tube if it's leaking? Just trying to understand, I've got many years experience with everything mechanical but this has me stumped, like there's one thing in each theory that just doesn't add up ! Good point. You do have it right. When you shut down the fuel line is still under pressure. A leaky injector will slowly seep fuel into the cylinder and the residual fuel pressure will fall off. The drop in fuel pressure is usually not an issue as the fuel pump restores pressure within a second or so of start up. The problem comes from all the fuel in the cylinder. Within the first 20 minutes to a couple of hours the bike will act like it's flooded. If the bike is parked long enough the fuel pressure falls off, and fuel in the cylinder eventually evaporates and the bike can start normally. Anytime I've seen a leaky injector issue the plugs usually foul fairly quickly due to the very rich start ups. If your bike is running well otherwise this may not be the case. | ||
| Hermit |
I think that the intake air sensor in the airbox gets heated up from the motor when stopped for the 10-20 minutes causing a lean condition when restarted until it cools back to the actual intake air temperature. | ||
| Rkutzner |
Thanks guys! The bike is stock except for a K&N. I'll just have to wait until it becomes a bigger problem. Like I said, it happened once last Aug and just the other day. That's the only problem I've ever had with the bike and it's not a show stopper. It runs so dang strong any other time that I can't imagine it's a problem that will get worse...and that only because if it starts bad it stays bad way past the amount of time it would take to get vapor locked feul out or a flooded cylinder. Though at almost 56 mpg in the summer maybe 5 minutes isn't long enough to get the cool feul back to the injectors. Hmmmm.....in my 455 Olds it doesn't take long at all ! |
