| Author | Message | ||
     Xbkris |
Started my own thread so that I did not piggy back on the 2009 uly owner with similar problem. If the bike has sat for a hour or longer when you start it, it will start then die. The longer it sits the longer it will do this. I have to play with the throttle while I let it warm up. Once warm it runs GREAT and no engine light etc. I had a 2006 xb that started first thing every time and never died so this cant be normal. Plus I have read others say theirs runs great cold. Cleaned the throttle body port with the butterfly open and removed the IAC and cleaned it and its hole as well today. Very dirty but did not help. TPS reset several times. This is getting annoying as my other riders at work get on their Harleys start them and go while I'm there for several minutes just trying to keep mine running. It has done this since I have owned it.(2 months? From reading other posts.... Check intake leaks, Plugs maybe fouled, fuel filter, Thanks in advance Back to the garage. | ||
| Hughlysses |
Random thoughts- -Let it get completely warmed up and then try the TPS reset. -I guess it's possible you have a bad or sticky IAC. Maybe give it a shot of WD-40 or something similar inside and see if that helps? If all else fails, replace it. -Intake leaks would be easy to check and seals are fairly easy to replace. -I can't see it being spark plugs but that's not too hard to check. -Fuel filter wouldn't seem to fit the symptoms. Plugged fuel filter would show up under WOT, not at idle. Good luck... | ||
| Xbkris |
did the tps reset on a cold motor. Remember reading that the engine needs to be warm since u said that. doing it now. | ||
| Xbkris |
No way to check the iac huh? Just got her hot and did the tps reset again. Will be a hour or so before knowing if that helped. Will search iac and see what i come up with next. Thanks ulyman | ||
| Froggy |
TPS really won't matter much on an 08+ bike, as the IAC is the thing that controls the idle. The throttle body is closed on your bike, not opened a crack like the older bikes, where setting the TPS and adjusting the idle were more crucial. To oversimplify things, the only is only controlled by two things, the IAC and ECM. The IAC is a stepper motor that controls a valve that opens and closes to allow air into the throttlebody and motor. The ECM monitors the IAC, how open the valve is, RPM, and clutch state, and then automatically opens and closes the valve as needed. It sounds like your valve isn't opening enough, but it is also possible you have an ECM issue, or injector issue too. Given that your issue only happens when cold, I am also suspecting your head temperature sensor, as if it thinks the bike is warm when its not, it won't "choke" correctly. | ||
| Xbkris |
Is the headtemp something that I can see if I had the ecm spy. Like would it show hot for example when the bike was cold? | ||
| Hughlysses |
Good point, Froggy. Temperature sensor may not be telling the ECM that the engine is cold, so it is not enrichening the mixture to compensate. Therefore, bike runs like dog until it gets hot, at which point ECM is providing correct amount of fuel. | ||
| Natexlh1000 |
With ecmspy, you can hook up to your bike's brain first thing in the morning and ask it what temperature the intake air and engine are. They should both be the same as each other and also the same with the ambient temp. I don't know how tight the tolerances are though. | ||
| Froggy |
Use Tunerpro instead of ECMspy, but yes it will show you exactly what the ECM thinks is going on with all the sensors. | ||
| Electraglider_1997 |
Better in every way, right froggy? | ||
| Xbkris |
Hughlysses, Well I warmed the bike and did the tps reset on a hot engine. Started it up this morning and the rpms climbed and held. The engine warmed up by itself and it never died. Was pumped. Hopefully that was not just a fluke thing. Thanks guys. update in a couple days. | ||
| Hughlysses |
Kris- Glad it worked out- hopefully that's it. | ||
| Xbkris |
I love a easy fix like this but they always make me hang my head in shame for getting all worried. | ||
| Xbkris |
Well, thats odd. Its right back to doing the same thing again. Man that urks me. Even more so when my coworkers are standing around watching me constantly restart it over and over again. If I dont get this fixed I may end up in a fist fight! I guess once back from this trip I will have to look into getting the tunerpro and the connector to hook to my laptop to fix this issue. Weird how a tps reset fixed it for a couple weeks...... | ||
| Hughlysses |
It seems like that'd be a clue to the real problem. Maybe you have a bad TPS? Say it's got a bad spot near the fully closed position, and every so often when the ECM resets the TPS it's based on a faulty reading. Total guess on my part... | ||
| Buellmeister57 |
I've been having similar problems with my 09 Uly. The first 14,000 miles my bike started and ran perfect. Then it started stalling, erratic idle, etc. I ordered an EBR ecm and cleaned the IAC. It does better but it's still not right. I ordered an IAC, 179 f@%?ing dollars! Hopefully this will take care of my problem. | ||
| Bikelit |
A year ago, my 2008 ran like crap when cold and perfect when warm. A new Throttle Position Sensor and it's been fine since. One thing I learned, it could be any one of 20 things, so be patient. | ||
| Bpt |
Am I correct that there are no codes stored and the check engine light is not on? I thought if a sensor was out of range or at fault, there would be a code stored for that sensor. | ||
| Xbkris |
Bpt, there is no check engine on, nor does one come on when it is being restarted. I'm sure with the tuner pro, and help from this forum I will get it figured out in time. Bikelitm were you able to check your tps? Buellmeiste57, let me know if you think about it if it fixes your problem. Hugly, so the computer does a automatic tps reset of its own some times? Thanks guys, | ||
| Buellmeister57 |
Shop just called, IAC is in. I hope to install it this weekend. I'll let you know if it helps. | ||
| Bikelit |
Bikelit were you able to check your tps? Yes, I checked voltage throughout the throttle range. The readings looked correct to me, but a little jumpy off idle. Now sure it was the IAC, I replaced it, but nothing changed. I then replaced the TPS and the problem was gone. It took a while to get to that point. I had checked grounds, plugs, wires, coil, fuel pressure, bad gas, injectors, intake gaskets, compression, and I'm sure other stuff. That's why I wrote to be patient. The secondary sensors(iat, head temp, O2), I could unplug them all and the bike ran crappy when cold in default mode. It now runs fine when cold with them unplugged. The head temp sensor could be reading warm all the time. That could screw it up. Unplug it when cold and see what happens? |
