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 2008 WR250R starting problems

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PostSubject: 2008 WR250R starting problems   Fri Sep 07, 2018 9:59 pm

I recently bought a 2008 WR250R. From the looks of it was probably kept outside for a long time as it had rust on the handlebars. It also only had about 1900 miles to when I got it and I've since put about 250 miles on it.

The bike is having problems starting while it's cold. It's taking multiple cranks to get it to start and this seems to be getting worse. Gradually a red light comes on, then check engine light and then it finally starts. Last time when it finally started and was warming up in neutral I pulled the throttle and it died several times until it fully warmed up. Once it's warmed up, it runs fine and restarts easily on the first crank.

So far I changes the battery, the spark plug and the injector coil assembly but no improvement. I refilled gas several times, always 93 octane. It came a FMF exhaust with programmer, and I added a gear indicator, which works fine.

Any ideas what may be causing this problem? Could it be air intake or air filter? Valves? Could it be a weird fuel map?

Any help would be appreciated!
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PostSubject: Re: 2008 WR250R starting problems   Sat Sep 08, 2018 3:49 am

Have you serviced the air filter?
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PostSubject: Re: 2008 WR250R starting problems   Sun Sep 09, 2018 1:02 pm

Air, fuel, spark...

Checking the air filter would be a good start..

I didn't see any mention of checking the fuel pump or injector. That may be something else to check next.
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PostSubject: Re: 2008 WR250R starting problems   Thu Sep 13, 2018 10:02 am

I changed the air filter, with no improvement.

Maybe the problem is the fuel pump or injectors. What would be the easiest way to check these? It does not have the typical fuel pump problem for this year which is shutting down in high temperatures.
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PostSubject: Re: 2008 WR250R starting problems   Thu Sep 13, 2018 10:46 pm

nyrider wrote:
Gradually a red light comes on, then check engine light and then it finally starts.

Sounds like the ECU is not aware that the engine is cold; could be the temperature sensor, or something similar.

If the check engine light came on, that means that the ECU posted an error code; what was the error code?
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PostSubject: Re: 2008 WR250R starting problems   Fri Sep 14, 2018 7:51 am

Yesterday after a short ride I turned off the bike while it was already warmed up, and it wouldn't restart at all, would die in a few seconds, and had to be towed home.

Then I went through the ECU diagnostic mode last night. The 2 error codes that are in the history are 30 and 41, both of which are lean angle sensor. The lean sensor was displaying correct voltage for the upright position, but I did not disconnect it. Perhaps the lean sensor codes are from a small drop the bike took a few weeks ago, not the current problem.

Also I checked the actuator operation through the diagnostic mode. I couldn't hear any sound for the air induction system solenoid (code 48) and for the intake solenoid (code 49), as the service manual says, which was suspicious. I guess if air induction is malfunctioning, it would explain the starting problem. All the other actuators seemed OK and the fuel pump definitely primes when the key is switched on.

My plan now is to remove the fuel pump and check it, try to clean the fuel filter and check the throttle bodies and injector. I also put Red Line 60102 Fuel System Cleaner in the tank few days ago. Air induction is also something to look at.


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PostSubject: Re: 2008 WR250R starting problems   Tue Oct 09, 2018 6:16 pm

Any updates on this?

I'm having hard start issues on my 2013 as well, specifically when cold.

I recently replaced the air filter and spark plug, which didn't make a difference.

Guess I need to start by checking engine codes, then go from there. Just curious what you found.
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