16 WR250R starts but dies after 1 min won’t idle

2016 WR250R.  Was riding trails. Check engine light came on but bike continued to run.  Stopped check oil and temp ok. Made it back and bike began to idle rough and died.  Bike has FMF header and Q4, AIS eliminator, Servo eliminator, and EJK programer. Ultimate airbox mod done.  Bike starts and runs fine when cold then after a min won’t idle and backfires.  When I hold throttle open just off idle bike RPMs rise and fall on their own. No check engine light on.

1). I disconnected battery for one hour.  No change.

2). I am about to empty tank and put fresh fuel and spark plug in it as well as bypass the EJK.

any guidance at this point is much appreciated 

Count the flash pattern of the CEL, it’s a diagnostic code that you can look up which will give you an idea of where to look for the problem.

I put new fuel in and took the EJK out of the loop and no change.  I reved the hell out of it and now it will idle but it’s hard to start when warm and the check engine light is on.  I’ve put the EJK back in the loop. I had a 13 & 30 fault codes present which I cleared.  I’m going to put a new spark plug in, but don’t believe that’s the problem.

I have watched the video on calling up the diagnostic mode and have done that.  All the parameters seemed in check other than the fault codes.

what is the CEL?

A vacuum sweep test is what confirmed my bad pressure sensor when I had Code 13 and symptoms like yours.  Use a hand vacuum pump and a guage to sweep the sensor and look out for sudden drops.

 

 

 

 

 

 

You can also do a throttle snap test like this.  Make sure the voltage does not go below 1.2 volts.

 

 

With the seat removed you can backprobe the ECU connector:

 

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Edited by BluePill

I’ve read go to diagnostic 3 and hit the start button.  If the value changes the sensor is good. But if it does not it’s bad.  It did not say if the kill switch was on or not.

on mine with kill switch on value is 100 and does not change.  With kill switch off engine turns over, does not start and value changes.

what do you think ?

Also read just unplug it and ride.  ECU will default to a base map and run fine.

this is an expensive part and bike is a little over a year old with only 2400 miles on it.

sucks

I have a 2017 WR250R with the FMF Q4 exhaust, servo eliminator, AIS eliminator, EJK fuel programmer and airbox mod....I have noticed as well, while riding in 5th or 6th gear around 95-105 km/h the bike will completely loose all power, almost stall.  I have to let go of the throttle and then open it up again to regain power.  The problem has been getting more frequent and worse.....anyone with any ideas as to the cause???

Step one always with any programmer: Bypass the programmer by returning all connections to stock. See if that cures the problem.

20 hours ago, woods-rider said:

Count the flash pattern of the CEL, it’s a diagnostic code that you can look up which will give you an idea of where to look for the problem.

CEL = Check Engine Light.

 

In the case of the WR250R it does not blink codes.  They are read out via the diagnostic display process (in the above video).

Check on the EJK Site .  They tell you what to change if your having this problem.  Mine did it twice .

Checked all I could . New IPS ordered.  Let’s hope the WR knows what it’s asking for

CEL = Check Engine Light.
 
In the case of the WR250R it does not blink codes.  They are read out via the diagnostic display process (in the above video).


My bad, I was thinking WR250F

Got the new IAP Sensor.  Put it in and success.  Bike runs fine.  While I had all apart I made the adjustment to the EJK mentioned above.  Found a used IAP  on eBay for $16.99 so let’s hope it holds up. $90+ for a new one is ridiculous!   May snag another one tonhave a spare.

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