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2009 KX450 Intermittent Stall At Idle

By bajarcr,
in KX450F/X

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bajarcr

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My 09 has close to 200 hours now and in the last 15-20 hours I have had 3 or 4 occurances of this. Basically the bike will be idling normally and start to sound like it is loading up and idling rough and will then usually stall. It always restarts within a couple kicks and will do the same thing soon after. Some days the problem will not exist, other days it will happen again and again. It always runs perfect reguardless of whether or not the problem is happening that day.

Twice I thought that I had it fixed by resetting the TPS to .62 volts (output voltage) but the problem has since reoccured. In my last attempt to fix it, I found that unplugging the TPS seemed to fix the problem by presumably putting the FI into some sort of fail-safe mode. However the TPS resistance and input/output voltage are in spec.

Any suggestions?

To avoid any silly comments...............

My valve clearance is perfect (never gone out of spec)

Cam timing is correct

My piston/rings/cam chain have been changed recently

It is not the fuel pump (replaced at 130 hrs and current pressure is good)

I have tried a new fuel injector (suspected it was leaking)

Throttle body has been properly cleaned recently

There are no intake or exhaust leaks

There are no FI codes

Bike is 100% stock except for FMF exhaust and Moose air filter

Has stock map (never played with it)

Thanks.

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pellett22

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Does this happen cold?

My '09 will stall sometimes if it's not warmed up properly. Lately, I let it sit for 2 mins before taking it off the stand and taking it to the track.

What kind of fuel? Spark Plug been checked? replaced? Have you tried to the turn the idle up? Should be @ 2000rpm.

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XtremeDuners

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Sounds to me like you just have a connector that's not getting a good connection 100% of the time. Which is a pain, cuz you have to figure out where it's coming from. To me if it was ever a part, like the injector or a pump it would do it all the time no matter what. I may very well be wrong, I know I'm going to go nuts the first time my 09 has issues like this.

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VETMX808

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I would definitely go through all your wires. Check the connection next to your airbox especially since this regulates air flow mixture. Sounds like your bike is getting "lean" with the high idle, then the bike sensor is shutting things down. The sensor inside could be covered in dirt (Wouldn't take much). This wouldn't show an error because the bike isn't running and can't diagnose the problem...just my 2 cents.

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VETMX808

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I would definitely go through all your wires. Check the connection next to your airbox especially since this regulates air flow mixture. Sounds like your bike is getting "lean" with the high idle, then the bike sensor is shutting things down. The sensor inside could be covered in dirt (Wouldn't take much). This wouldn't show an error because the bike isn't running and can't diagnose the problem...just my 2 cents.

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bajarcr

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Does this happen cold? Hot or Cold when its acting up

My '09 will stall sometimes if it's not warmed up properly. Lately, I let it sit for 2 mins before taking it off the stand and taking it to the track. I warm up my bike

What kind of fuel? 91 pumpSpark Plug been checked? replaced? of courseHave you tried to the turn the idle up? Should be @ 2000rpm. yes i know

There is a bigger problem at hand than what you suggest.

Edited by bajarcr
took it down a notch
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bajarcr

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Sounds to me like you just have a connector that's not getting a good connection 100% of the time. Which is a pain, cuz you have to figure out where it's coming from. To me if it was ever a part, like the injector or a pump it would do it all the time no matter what. I may very well be wrong, I know I'm going to go nuts the first time my 09 has issues like this.

You may be right but I can't find it and yes it will drive you nuts. All connectors are clean and coated with dielectric grease. FI is great until you have a problem with it.

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bajarcr

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I would definitely go through all your wires. Check the connection next to your airbox especially since this regulates air flow mixture. Sounds like your bike is getting "lean" with the high idlere-read my post, then the bike sensor is shutting things down. The sensor inside could be covered in dirt (Wouldn't take much). This wouldn't show an error because the bike isn't running and can't diagnose the problem...just my 2 cents.

So tell me, what exactly do you call a "bike sensor". ?

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jw44024

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listen you know it is not mechanical otherwise it would be doing it all the time. It is related to something electrical. the wiring or a component. With EF the troubleshooting process is very diffuclut when the problem comes and goes. Don't disconnect the advice.

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bajarcr

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Maybe technology, wit, and common sense have not made it to Ohio and Montana yet but for the record there is no such component as an "air flow sensor" and closed loop FI sytems work with a O2 sensor which dirtbikes do not have therefore making them an open loop. Also what you do not seem to be able to comprehend is that for the most part I do know what I am doing and problems such as loose or dirty connectors have certainly been eliminated as possible problems so lets not get confused and think that I am disreguarding your "advice". I am much farther into the diagnosis than I think your mechanical ability will ever take you so lets all stop suggesting to check things that even a blind monkey would check and eliminate right off the bat. My intentions here were simply that someone may have experienced the same problem and knew what it was or someone possibly could share their vast knowlegde of Kawasaki's FI system. That being said you really have no place to comment on this topic so I am done with you and this thread at least until someone can make a logical and specific statement as to why they think that they know what I am missing. Out.

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numroe

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bajacr, Your original question post is perhaps the best I've ever seen here. Impressive. But you have a lot to learn about people skills and probably life in general. People here have been trying to help. Yet you come back saying you dont want guesses, and you also sound nothing but angry after your first reply. Real built in anger comes across. Like you are trying to quit dope or whatever. I dont think I've ever commented on a discussion which has got personal, but you're just so wrong in your approach here. You just dont seem to get how TT works. You could get 50 replies and 49 wont help, but maybe one could give you a clue. But no. You prefer to shoot people down for commenting. Does it really hurt you so bad to read a reply that doesn't help? Sad if so.

jw44 might be stating what you think is obvious, but obviously you dont know it all else your precious bike would be running great. Why do you trust ECU diagnostic codes? Do you really understand the ways in which transistors can fail? There are other things you've overlooked, but you'll work it out. Your the mechanic remember.

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bajarcr

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bajacr, Your original question post is perhaps the best I've ever seen here. Impressive. But you have a lot to learn about people skills and probably life in general. People here have been trying to help. Yet you come back saying you dont want guesses, and you also sound nothing but angry after your first reply. Real built in anger comes across. Like you are trying to quit dope or whatever. I dont think I've ever commented on a discussion which has got personal, but you're just so wrong in your approach here. You just dont seem to get how TT works. You could get 50 replies and 49 wont help, but maybe one could give you a clue. But no. You prefer to shoot people down for commenting. Does it really hurt you so bad to read a reply that doesn't help? Sad if so.

jw44 might be stating what you think is obvious, but obviously you dont know it all else your precious bike would be running great. Why do you trust ECU diagnostic codes? Do you really understand the ways in which transistors can fail? There are other things you've overlooked, but you'll work it out. Your the mechanic remember.

numroe, you are spot on. It was a well written post and yes I do lack the skills necessary to deal with what I will call typical motorcyclists. Yeah I'm a pretty angry person but generally motorcyclists are really poor mechanics and incredibly stupid.

TT doesn't work. Rarely is there quality information here. Reading worthless posts does get old. You seem to be able to tolerate it though since you practically live on here but lets cut the personal BS.

I never said I knew it all. The bike does run great it just has a minor inconvenient idling issue once in a while. When did I say I was trusting a ECU code? There are none. No I do not fully understand some electrical components.

Thanks for a quality reply. I can take it.

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