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2003 Yamaha HPDI problems

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  • 2003 Yamaha HPDI problems

    I have 2 plugs that don't fire top left and middle right I switched out the coils and the problem stays in place. The coils are good. Is it the engin control unit? The wires check good to the cannon plug on the control unit and back to the fuse box also.
    Last edited by bigdawg6391; June 11th, 2009, 09:16 PM. Reason: spellig check

  • #2
    Re: 2003 Yamaha HPDI problems

    are you testing this in nuetral on the muffs?
    is it left and right while standing on the dock barking at the moon?
    HPDI in nuetral wont spark cylinders 2 and 3.
    cyl 3 is the middle on the starbord bank and 2 is top on the port bank.
    if your testing it in gear and get the same results test your shift position switch.
    or your cable adjustments.
    no tech questions by PM, they wont get answered.
    you have to be trusted by the people that you lie to .


    • #3
      Re: 2003 Yamaha HPDI problems

      Thanks for the info I was having the surging problems that all the other HPDI owners were asking about and did not know about the 2 not fireing in neutral. I went ahead and changed the filter attached to pump in the VST tank and all is well for me. Again thanks


      • #4
        Re: 2003 Yamaha HPDI problems

        along with the annual VST screen cleaning, the medium pressure filter/strainer needs replacement too.


        • #5
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          Re: 2003 Yamaha HPDI problems

          Will Do Thanks