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  1. #1
    Resident electronics hacker UnityRacing's Avatar
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    GRRR! Bad MFD caused me to spend big $$ on a new EMM!

    So last weekend I was trying to finish up my project Virage, and I couldn't get the damn thing to start. Tried all the TS steps here to no avail, and was seeing low voltage on the injectors. I figured the EMM was toast since all the sensors were brand new. Bought another EMM + matched injectors since I didnt want to have the EMM repaired only to find I had a bad injector (Never ran this ski, so I didn't know what condition they were in). Got new EMM and injectors in and was the same exact symptoms. I was hot.
    Buddy was flipping through the service manual and asked if I checked the MFI, and I was like WTF is an MFI. Then it hit me, MFI = MFD as we all call it here. Swapped to another one I had sitting here, and sonofabitch it fired up. I was so freakin happy, then turned to anger, at myself - for not checking that last weekend. Project has been going on for 5 years now. A few more hours of clean up and I can hit the water and see how my PWC building skills are.

    Moral of the story - if your DFI won't start, try swapping MFD's or grounding the two wires listed in the manual. A bad MFD will cause a voltage drop while cranking, and low fluctuating voltage at the injectors.

    Stupid display. At least I have a spare EMM/Injectors here now.


  2. #2

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    good info right here

  3. #3
    Resident electronics hacker UnityRacing's Avatar
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    After rebuilding an entire DFI Virage, and troubleshooting the other one last year, I now proclaim myself a subject matter expert !

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