Injectors not firing gt250

[Bertie]

Hi guys! I have search through the forum without any luck to my problem.

I recently acquired a 2010 gt250, after cleaning the tank and the fuel pump I tried starting the bike, and it just does a little cough at the first second but not signs of willing to start.

I checked the plugs, I got current, I got fuel at the injectors and not fi codes, checked also maintenance mode, no c codes. I test injectors resistance, they are at 12.7ohm, in specs as per manual. They receive 12v for the first 3 second of key on, checked at the injectors plugs, although the voltage changes polarity after that, for few second and then they are sitting at 5volts.I trigger them manually and they open, I spray with compressed air whilst open and the spray good.

Try to crank with the injectors connect but out of the block to see if they are opening and nothing happens, bike starts and run if I spray fuel in the intake. She’s not getting fuel.

I got no way to measure fuel pressure, do you know, if the fuel pump is not performing as it should, does it prevent to open the injectors? Is there a fuel pressure regulator? Do you think is the ecu that does let them open? Tia for any help

 

[♠️ MARCEL]

Hey , welcome . I just have to ask few questions to gather data from you.

• What ECU does it have ? Sentec? Daewoo? or Delphi  (Post a picture of it , if you can)
• Have when you turn kill switch red button ON (killed)  – Does the FI light come on or CHE error on the display?
  And if you turn the kill switch OFF (bike is good to go) – Does the fuel pump prime (huming noise) ?
• Is the Neutral light ON? KickStand switch is bypassed (the kickstand switch is that annoying it causes issues)
• CLutch Handle Bar Switch  (Temporarily bypass it and see what happens) = I would NOT bypass it forever as I’ve myself experience false starts when the bike was still in gear and it fell ,  this was years ago anyway, even the Kawasaki i had was no better! So i prefer the bike knows i’ve squeezed the clutch in before starting and slowly letting go incase of fake neutrals.

Drain fuel from the tank => Look to see if the fuel pump strainer is clogged up ? (although you cleaned it before, check one more time)

 

Do you get bright blue sparks from each coil ?

 

Ever did a cold compression test on the engine and tell us the PSI markings ? (It could help to know this especially)
– Both plugs out.  Injectors disconnected.
– Crank the bike for 5 seconds => Read each cylinder for compression readings and tell us.

 

I do hope its something small (that we have both missed) but all i have said above , is usually common causes.

// Meditation doesn't mean you have to sit still....

[Bertie]

Hi Marcel, thank you for your reply.

I have read the forum thoroughly before ask the question and went through all your suggestions. Compression test is 150psi on both cylinders, I have bypassed the clutch but not the stand, I’ll be trying that tonight. Neutral green light on no fi codes. Fuel pump is priming when turning the key, and I can hear it working during crank. Bright blue spark at both coils. Stop button does is job CHE code when in off position and try cracking..

Fuel pump strainer clean, although when I got the bike the fuel pump was cactus and not having a replacement for it, I have open the old one, she wasn’t turning at all, I have pulled it apart and free it. She works all right but I’m wondering if she doesn’t deliver the right fuel pressure hence why the injectors won’t open. Do you think it can be the case? I’ll be sourcing a new one anyway, I was just keen to start the bike.

[José María]

It may be the fuel pressure regulator that is locked in open position, it is located on the fuel pump housing and must be closed until 3,5 bar aprox. If it never closes, you will never got the right fuel pressure . I had that trouble with a gv250 EI that was stored for 11 years

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