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  1. #1
    Cadet
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    Default 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 at 09:16 PM. Reason: spellig check

  2. #2
    Supreme Mariner
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    Sep 2003
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    Kitty Hawk NC
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    Default 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.

  3. #3
    Cadet
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    Thumbs up 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. #4
    Senior Chief Petty Officer cousinabe's Avatar
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    Nov 2001
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    Federal Hill - Baltimore City, MD
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    Default Re: 2003 Yamaha HPDI problems

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

  5. #5
    Cadet
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    Default Re: 2003 Yamaha HPDI problems

    Will Do Thanks

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