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    Gen 1 Hayabusa, cylinders 2 and 4 dead
    #1
    Senior Member
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    OK so it you recal, my last issue was engine running smooth at idle, will rev without load but falls on it's face under load, anything over 1/8 to 1/4 throttle, turned out to be a fuel pump issue, clogged strainer, replaced the whole system with an 044 pump, pre-filter and external regulator, seemed to be the fix.

    new issue, as stated in the subject, now cylinders 2 and 4 are pretty much dead, parked the car after a Thursday ride, gassed up Friday morning and when I started it, it was running bad, I'll go through the list of what I checked:
    fuel pressure, good
    pulled air filter, started the engine and pulled coils off one by one, cylinder 1, engine dies
    Pulled coil from cylinder 2, no audible change.
    Pulled coil from cylinder 3, engine dies.
    pulled coil from cylinder 4, no audible change.

    When I pulled the coils I verified that they were all sparking.

    Swapped coil 1 and coil 2 and swapped coil 3 and coil 4, repeat the above operation, no change.
    swapped out spark plugs same as above, no change.

    Pulled fuel rail and injectors, crank it over, all injectors appear to be squirting.
    Checked compression, though not great, all cylinders at 150 +/-5psi

    That's where I'm at actually nowhere, at least I didn't dive in and pull the head and cylinder.

    The next thing I can try is to actually swap injectors, same as I did with the coils just to verify that they are not the cause.

    accepting any and all comments and suggestions
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    Re: Gen 1 Hayabusa, cylinders 2 and 4 dead
    #2
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    Do a compression test.
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    Re: Gen 1 Hayabusa, cylinders 2 and 4 dead
    #3
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    Reading. I should do it more.
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    Re: Gen 1 Hayabusa, cylinders 2 and 4 dead
    #4
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    Clean injectors again. Jammed with thread tape?
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    Re: Gen 1 Hayabusa, cylinders 2 and 4 dead
    #5
    Millenium Member plkracer's Avatar
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    Take an eye dropper and squirt some fuel down the throttle bodies. I found a lame injector pretty quick that way.

    Hopefully it isn't the injector driver in the ecu.
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    Re: Gen 1 Hayabusa, cylinders 2 and 4 dead
    #6
    Millenium Member plkracer's Avatar
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    One of those little #193 automotive bulbs works good as a noid light to test the injector signal.
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    Re: Gen 1 Hayabusa, cylinders 2 and 4 dead
    #7
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    I'll do the injector swap Saturday, if it is injectors then I see them on ebay for new ones for less than $40 for 4, has anyone used those before, any issues?
    https://www.ebay.com/itm/4-X-Fuel-In...53.m1438.l2649
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    Re: Gen 1 Hayabusa, cylinders 2 and 4 dead
    #8
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    So, I swapped injectors and the dead cylinders followed the injectors so that appears to be it!
    anyone try the cheap injectors found on ebay?
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    Re: Gen 1 Hayabusa, cylinders 2 and 4 dead
    #9
    The Wizard bdkw1's Avatar
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    2 and 4 are probably firing at the same time, wasted spark system. Check the pick-up. Also, was the comp check done with the throttle wide open? If not, you will get funny low readings.
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    Re: Gen 1 Hayabusa, cylinders 2 and 4 dead
    #10
    Millenium Member plkracer's Avatar
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    The busa uses a reluctor wheel, and a cam position pickup (No wasted spark) not a hall effect pickup, so the ecu either triggers all to fire, or none.

    If the dead cylinders follow the injector, it must be the injector. Pop them off, and take a look. I have a hard time believing those ebay injectors are anything close to genuine for that price.
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