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Author Topic: GT250R EFI stall when cold  (Read 3443 times)

r052tg

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GT250R EFI stall when cold
« on: December 05, 2011, 11:31:36 AM »

Hi everyone, i got a GT250R EFI ,It stalls much when the engine is cold.

I had replace a new air filter,

New engine oil

New spark

New Pick up coil

And my bike 's FI lamp is not on.

I did check the Front and rear Ignition Coil , they are fine,the resistent is good, and the spark can fire as well.


The bike can start well ,but it just keep stall when cold.

I can restart the engine immediately after it stall .

It's ok if the engine is hot.

Did anyone have anyidea about this?

It's drive my crazy..

Thank you
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SippiHyo

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Re: GT250R EFI stall when cold
« Reply #1 on: December 05, 2011, 01:37:39 PM »

Are you giving the bike the proper warm up time?
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r052tg

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Re: GT250R EFI stall when cold
« Reply #2 on: December 05, 2011, 02:46:43 PM »

the bike stand right there, i have not ride it...

It's just ideling...

It will stall after start 5 seconds, 10 sec.... just any time it like.

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Solar Fire

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Re: GT250R EFI stall when cold
« Reply #3 on: December 05, 2011, 02:51:33 PM »

Basically, you can try these two options:

1. Change spark plugs from the the standard CR8E Plugs to either the CR7E Hot type of the CR9E Cold type.

2. You can also re-adjust the idle of the throttle body (just slightly... try it by 1/2 turns)

but if I were you I start with the plugs, it should do just fine, it heats up faster and auto adjusts idle automatically
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GT250

r052tg

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Re: GT250R EFI stall when cold
« Reply #4 on: December 05, 2011, 02:58:18 PM »

Hi, i had try them,not work :'(
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Solar Fire

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Re: GT250R EFI stall when cold
« Reply #5 on: December 05, 2011, 03:27:56 PM »

Have you checked the sensor in the throttle body for dirt? I had a similar prob on mine it seems that one of the sensors got a bit loose and the bike was stalling a couple of times. Carefully dusted it off placed it back on and no problems. Also there were other times were I had to calibrate the idle speed, but that's about it. The bike is not that complicated.
Hope this was of help
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GT250

r052tg

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Re: GT250R EFI stall when cold
« Reply #6 on: December 05, 2011, 03:47:58 PM »

Hi, Which sensor is that?

Do you have a picture?

Thank you very much.
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Solar Fire

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Re: GT250R EFI stall when cold
« Reply #7 on: December 09, 2011, 11:06:16 AM »

Hi, I cant seem to manage in uploading an image, sry mate. but you will find a sensor on the bottom of each throttle body next to the heat sensor. Also I forgot to mention, try to take out the lambda sensor which is sitting on the rear exhaust pipe and see if its all clogged up with carbon. If its dirty it might lead to giving an incorrect feedback to the ecu. ;)
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GT250

jake1093

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Re: GT250R EFI stall when cold
« Reply #8 on: December 09, 2011, 12:24:13 PM »

try uploading the image to third party site like http://www.tinypic.com and post the link to the image here... Sry i don't have an FI version otherwise i could have helped you out with it. :) Carby's are much more reliable.;)
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Solar Fire

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Re: GT250R EFI stall when cold
« Reply #9 on: December 10, 2011, 12:01:36 AM »

thanks for the suggestion, lets see if I managed this...   http://i42.tinypic.com/153sish.jpg

The system work like this: fuel sensor sends fuel when starting the engine, the vacuum sensor picks up the reading from the pressure induced within the throttle body, it then varies the flow of how much fuel it should be delivering when it gets a feedback from the lambda sensor which is then corrected by the other sensors in the air box and the ECU regulates all this while varying the timing of the ignition accordingly.... and all this is done before you could say oh snap engine stalled again... hah.... you cold say carbs are easier.... but if all's well ECU's are far more effective

If this sounds confusing you either check with a meter if any sensor within the wiring is out of range Voltage and resistance (or you could just grab some pliers and cut off the wires which bother you...joking :P XD)
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GT250

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