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Thread: Surging RPMs

  1. #1
    Join Date
    Jun 2013
    Location
    Lake Orion, MI
    Posts
    408

    Default Surging RPMs

    The other day we were out surfing and towards the end my boat began surging slightly while at a constant speed, fluctuating a few hundred RPM up and down at a pretty steady frequency. Almost seemed like it was running out of gas (it wasn't). I thought maybe it was PP related at first, and I don't remember now if I tried turning off the PP and going manual but pretty sure I did and it still did the same thing. I'm thinking possibly fuel filter, or God forbid a fuel pump. Anything else simple I'm overlooking that could cause this?
    2006 Mobius LSV
    Previous ride - 2000 Supra Launch

  2. #2
    Join Date
    Jun 2007
    Location
    Vancouver, WA
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    3,531

  3. #3
    Join Date
    Jul 2008
    Location
    Des Moines, IA
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    2,436

    Default

    If you haven't swapped the fuel filter lately that would be a good first step. Might be a good idea to mix in some fuel additives in case you have some water in the tank.

  4. #4
    Join Date
    Jan 2008
    Location
    Pensacola, FL
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    1,522

    Default

    check tranny oil level
    1997 MasterCraft 205

    2008 Moomba Outback
    1999 MasterCraft Sportstar OB
    1992 MasterCraft 205
    1999 Malibu Response LX
    1987 Marlin Magnum Skier

  5. #5
    Join Date
    Jun 2013
    Location
    Lake Orion, MI
    Posts
    408

    Default

    Hmmmm...no problems last night at all. I'm wondering if my gas gauge is off a little? I added 5 gallons and had no problem at all. I'd be shocked if it was only due to low fuel.

    Either way, I'll be going through everything during winterization in a few weeks and it'll have a new fuel filter regardless.
    2006 Mobius LSV
    Previous ride - 2000 Supra Launch

  6. #6
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    10,667

    Default

    Could be a load of sugar or some water dumped in there by those waterski guys you teed off.
    My Mom said I'm not allowed to get wet!
    2008 LSV
    Exile Tunes
    PWI
    LLTR!!!!!!!!



  7. #7
    Join Date
    Jun 2013
    Location
    Lake Orion, MI
    Posts
    408

    Default

    Quote Originally Posted by kaneboats View Post
    Could be a load of sugar or some water dumped in there by those waterski guys you teed off.
    That is a good point...foul play wasn't in my mind until now
    2006 Mobius LSV
    Previous ride - 2000 Supra Launch

  8. #8
    Join Date
    Jul 2002
    Location
    London Ontario Canada
    Posts
    1,815

    Default

    Actually at this time of the year with the change in humidity and the relative dew points , condensation may set up in your ecm and disrupt the electrical signals until the circuitry has dried out from heat dissipation of the current flow. Not uncommon in the early spring and late fall
    09 21v LAUNCH

    run your engine after you change your oil
    68 th Member. WS420,HSE Revolution, OJ 466, Acme1157,1100 sacs,Kicker HLCD's n IX500.4, Supra Coolies
    Doug

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