Injector Problems? Clean Plugs

Discussion in 'Busa problems' started by Busa Sam, Apr 14, 2017.


  1. Busa Sam

    Busa Sam Registered

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    2002 hayabusa, 315 miles.

    Bike has been hard to start, run for a few seconds then die...run then die...then eventually stay running.
    Can ride it, just slow acceleration.
    So I started checking the injectors and while the bike is running...started unplugging them.
    No change at all when I unplugged the 2 outside injectors...but when I pulled either of the 2 center injectors, the bike stalled.
    Decided to pull the plugs and 2 are clean and 2 look normal.
    Checked power going to the injectors and all light up.
    What should I do next? Any help is appreciated, thanks!
    [​IMG]
     
  2. Busa Sam

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    Also, I haven't removed the injectors...im thinking they just pull straight out but didn't want to break them.
    Any way I could test them?
    Bike did sit untouched for 12 or 13 years and I did have to replace the tank, fuel pump assembly etc
     
  3. Driver1976

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    First check if there is spark on spark plugs if yes switch the 2 working injectors on other not working cylinder if still the same check the pistons pressure maybe valves need grind
     
  4. Busa Sam

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    My fuel rail just came apart in the middle and won't stay together, one thing after another
     
  5. Busa Sam

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    Any1 help with the fuel rail? There's 1 o ring on it but when I put it together...its really loose. Is there more than 1 o ring or something else that's supposed to be on it?
     
  6. David Offor

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    David offor
    Any luck with your problems?
     
  7. David Offor

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    David offor
    Weak spark caused by a faulty ckps (crank shaft position sensor) was causing all my problems, it gave similar symptoms to what you are experiencing, when they start playing up, they send bad signals to the Ecu, which then tells the injectors and coils to operate at the wrong time, injecting mixture when all valves are shut for e.g
    if it was fuel related, I'd guess your plugs would be fouled or at least signs of all cylinders firing, could try swapping coils and injectors between cylinders (once you sort out you fuel rail of course)
     
  8. Busa Sam

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    Just had the injectors cleaned yesterday, I'll put them back in today after work and see what happens
     
  9. Busa Sam

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    Thanks for the reply! I haven't actually checked the spark, but looking at the electrodes on the plugs, they have to be sparking.
    I had 2 injectors that were completely stopped up and I'm really hoping that is the problem lol.
    When I get them back in after work, I'll report back.
    Thanks again!
     
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  10. Busa Sam

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    Just got the injectors in and wow, what a difference...throttle response and how quickly it revs now is amazing.
    Letting it cool down now to re check the plugs. Not really revving passed 8-9k though, like it starts to bog... any ideas?
    I don't have the air box back on yet but I doubt that would cause an imaginary rev limiter
     
  11. Busa Sam

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    Got the air box back on, tank bolted down and took it for a ride.
    Regardless if it's in neutral or gear, between 8k and 9k rpm it just bogs...pulls hard then just falls on it's face.
    Any ideas anyone??
     
  12. David Offor

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    Can you check your fuel pressure?, could be a worn out fuel pump or partially blocked filter, that is located in the plastic housing, in the fuel tank, that could cause high rpm running issues.
     
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  13. Busa Sam

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    Won't have time until this weekend unfortunately, any more suggestions for other things to also check will be appreciated.
    Thanks !
     
  14. David Offor

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    Shove a screwdriver in the coils, one at a time and check the couloir of the spark when cranking, it should be blue and strong under cranking, if it's yellow, you have issues, it's a process of elimination but eliminate possible causes 100%, otherwise you might ignore something relevant.
     
  15. Busa Sam

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    I will do that Saturday, thanks!
     
  16. David Offor

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    Just noticed that those plugs are iridium, it's supposed to have cr9e plugs, I was told that you can't clean iridium plugs, are/were they new? An you try a set of stock plugs?
     
  17. Busa Sam

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    It's what they gave me at the parts store...yes they were new and 2 looked new when I pulled them, like u see in pic.
    I'll get some new plugs tomorrow and change them out Saturday
     
  18. David Offor

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    The stock plugs are much cheaper than iridium plugs, I've had ducatis before and I found that they actually run better on the stock/cheaper plugs than on the iridiums.
     
  19. Busa Sam

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    Ok thanks! I will try the regular plugs.
    I'm also going to pull the fuel pump assembly back out and clean the strainer and filter or whatever it is
     
  20. Busa Sam

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    I checked the plugs, all are getting a nice blue spark.
    I don't have a gauge to check fuel pressure so I decided to pull the tank off and check the pump.
    I had to buy another tank and full pump assembly since the one originally on the bike was extremely rusty.
    I wish now that I would have checked the pre screen before pumping in in the bike the 1st time lol...anyways, here's what I found...
    [​IMG]
    [​IMG]

    Pretty nasty.. I also picked up some new plugs, the regular non iridium ones and as soon as get the tank back on, I'll report back.
    Thanks for the help so far!
     

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