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  1. #1
    Join Date
    May 2010

    Help.....502 mag

    I have a 502 mag EFI that runs great and has 47hrs on it. The last two times I've been out on the water and while at idle it will ramp up about 300 rpm and holds and wont come back down . When I shut it down and recycle the ignition it wont do it again for awhile. There are some days it does it several times and some days it dosent do it at all. Any Ideas???
    Last edited by Outlaw118; 05-06-2010 at 07:50 PM.

  2. #2
    Registered PhantomChaos's Avatar
    My Boats:
    Formula FASTech 382 Sunseeker Apache 45
    Join Date
    Dec 2000
    Bell Canyon, CA
    Welcome to the board! I have no idea.......

  3. #3
    Charter Member # 55 Charter Member Griff's Avatar
    My Boats:
    ..........32........... Active Thunder
    Join Date
    Oct 2000
    Probably the IAC going bad. You are best off to run a scan tool on the engine.

  4. #4
    Charter Member Charter Member Ted G's Avatar
    My Boats:
    Marlago 35 FS, 18 Neptune CC
    Join Date
    Jan 2001
    Edgerock Baby!!
    It is likely to be the Idle Air Control. It has a little plunger that gets carboned up and will stick. You might try taking it off and cleaning with carb cleaner. If that fixes it, buy a new one because the bild up will return. Also clean the port it goes into real well, build up there can cause an idle problem too. When you turn the engine off the IAC resets itself, which is why it seems to fix itself.
    Chesapeake Bay Powerboat Association

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