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  1. #1
    Join Date
    May 2017
    Posts
    6

    Default idle to wide open throttle boat stalls at about 3000 rpm's

    need help
    from idle to WOT my boat stalls at about 3000 rpm's for 1 to 2 seconds but recovers and runs fine, also runs fine
    the rest of the time.

    drained tank refueled with high octane non ethanol
    replaced fuel filter
    replaced water fuel filter
    replaced TPS sensor

    1998 MOOMBA OUTBACK
    515 HOURS
    INDMAR 350 GEN 1 PLUS EDL MPI ENGINE

  2. #2
    Join Date
    May 2009
    Location
    North End Lake Lanier GA
    Posts
    7,941

    Default

    When your below 3k is it smooth and responsive?

    When is the last time you changed plugs, wire, cap and rotor?


    Sent from my iPhone using Tapatalk
    Malo <--- Means--Evil or Mean One. This explains a lot.
    2013 Mojo 2.5 Skylon Tower. Bestia < Beast >

    https://vimeo.com/59208513?from=outro-local

  3. #3
    Join Date
    May 2017
    Posts
    6

    Default

    runs smooth and responsive other then when idling for long periods it
    will surge sometimes.
    haven't changed plugs, wires or cap and rotor

  4. #4
    Join Date
    May 2009
    Location
    North End Lake Lanier GA
    Posts
    7,941

    Default

    I would start with those items

    After that your prolly having issues on your carb secondary jets or plates

    If you can have someone drive so you can see if the secondary butterflies are opening on your carb

    You might be running super rich over 3k

    Black or wet spark plugs will show that as well.

    If butterflies are opening you might be having jet issues. At WOT you should see fuel spraying.


    Sent from my iPhone using Tapatalk
    Malo <--- Means--Evil or Mean One. This explains a lot.
    2013 Mojo 2.5 Skylon Tower. Bestia < Beast >

    https://vimeo.com/59208513?from=outro-local

  5. #5
    Join Date
    May 2017
    Posts
    6

    Default

    the 350 MPI is efi, but my next step was to change those items thanks

  6. #6
    Join Date
    Mar 2003
    Location
    s.e. washington state
    Posts
    2,670

    Default

    First I learned Moomba used EFI in the 98s. I knew they offered both PCM which I have and the Indmar engines and that may be the reason. Besides what Mike mentioned, I would recommend running Seafoam through the fuel system.
    1998 Mobius
    310 HP PCM

  7. #7
    Join Date
    May 2009
    Location
    North End Lake Lanier GA
    Posts
    7,941

    Default

    Sorry missed you had EFI lol


    Sent from my iPhone using Tapatalk
    Malo <--- Means--Evil or Mean One. This explains a lot.
    2013 Mojo 2.5 Skylon Tower. Bestia < Beast >

    https://vimeo.com/59208513?from=outro-local

  8. #8
    Join Date
    May 2017
    Posts
    6

    Default

    any body??????

    need help
    from idle to WOT my boat stalls at about 3000 rpm's for 1 to 2 seconds but recovers and runs fine, also runs fine
    the rest of the time.

    drained tank refueled with high octane non ethanol
    replaced fuel filter
    replaced water fuel filter
    replaced TPS sensor
    replaced spark plugs, cap and rotor

    1998 MOOMBA OUTBACK
    515 HOURS
    INDMAR 350 GEN 1 PLUS EDL MPI ENGINE

  9. #9
    Join Date
    Mar 2014
    Location
    Park City, Utah
    Posts
    1,071

    Default

    WOT on the three boats i have owned is higher than 3,000 rpm. What does it do at 4,000?

    Other thought was fuel, but you're already using what I would recommend, have you burnt through a full tank of the good stuff yet? Maybe second full tank will be better?
    2013 Supra SA450
    2006 Mobius LSV - Sold
    2004 Stingray 190LS - Sold
    2016 Nissan Titan XD - Tow Rig
    www.tffor.org

  10. #10
    Join Date
    Aug 2016
    Posts
    6

    Default

    I m thinking if the system uses a mass air flow sensor then as you accelerate it will not know the correct air flow and not provide spark and fuel properly

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