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  1. #11
    martincom's Avatar
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    Be sure to keep track of which injector came from which cylinder. The injectors are mass produced and once built, their flow characteristics are measured and that information is used to calculate calibration values referred to as "coefficients". These are, in turn, programmed into the EMM, so it can generate the correct ignition pulse.

    If you didn't keep them straight, you 'll need to read the EMM and it will report which serial number injector is assigned to a specific cylinder.

  2. #12
    DrChuck's Avatar
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    Hello MSX140 fans,

    I did keep track of the injectors but ty for the reminder for all the other MSX140 users.

    After swapping the injectors the same issue. Starts but stumbles upon throttle. Taking the plugs out I rechecked for spark. And middle cylinder had no spark. Moved the plugs around and the no spark followed the one plug. Odd cause I know I checked them. Must have been tired. Yep going with that. So going to put the injectors back in there proper place and buy a new set of plugs and see what happens.

    Chuck

  3. #13
    martincom's Avatar
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    I have found the Champion QC10PEP to be superior to the NGK. I've beenutilizng them for 15+ years without a foul or issue.

  4. #14
    DrChuck's Avatar
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    Update
    So I replaced the spark plugs with NGK PZFR6H. Got spark back to all cylinders. Ran it in the yard and everything worked. Took it to the lake it worked great for 3 laps around the lake full throttle about 10-15 min.
    I'm thinking once the ski warmed up then same issue as before. Ran perfect low to mid throttle but as soon as I went from mid to full throttle motor fell flat. I've checked the throttle position sensor and it tested good.
    I'v attached pictures of the plugs. Left plug is PTO right is front. For some reason the PTO plug looks much worse than the middle and front plug.

    Any suggestions????
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  5. #15
    Moderator HiPeRcO's Avatar
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    What is your fuel pressure? Have you measured it under load?

  6. #16
    radio-active's Avatar
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    Your boat is missing the fuel hose protection update. And you should probably replace that ancient fuel hose. Brittle and hard as a rock.

  7. #17
    martincom's Avatar
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    It is time to perform the compression test queried in post #2.

  8. +1 by:


  9. #18
    DrChuck's Avatar
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    yes 28-30 psi
    as I work on the fuel lines the hard ones get replaced.
    compression 130, 130, 128


  10. #19
    DrChuck's Avatar
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    Also replaced the coil for PTO and middle cylinder. Tested it this weekend and same issue. Fired right up ran around the lake 2x (10ish min) Once engine warmed up couldn't give gas over mid throttle.
    Brought it home and PTO cylinder spark plug was still the issue

    Only thing I can think that is left is the computer or the injector.

    Any thoughts?
    Chuck

  11. #20
    martincom's Avatar
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    Spark plug wire? Swap with another cylinder.

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