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8.1s 496 MAP HI fault code

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by Searay45, Sep 21, 2020.

  1. Searay45

    Searay45 New Member

    Sep 10, 2018
    North East, MD
    2007 Sea Ray Sedan Bridge 360 Dual 8.1 Horizon Engines, Raymarine E120 Chartplotter
    Dual 8.1 S Horizon

    I'm starting a new thread as the other one I made got lost with the hydro lock issue.

    I just installed all new risers, manifolds, plugs and wires. Took the boat out for a run and it ran awesome for 20-30 min. As soon as I took it above 3,600rpms, then a loud beep and both engines shutoff. I lost all power to the dash everything went blank for a quick second. Then I toggled the start switch and they both fired up. The alarm was still present and smart craft showed Port fault MAP Hi. Engine Guardian enabled. I ran the boat back to the dock, everything seems great but the code is still there and active. I shut the batteries off at the dock. Then I turned them back on and turned the ignition to on without starting the boat and the code appeared active. The engines started right up. Boat seems to run perfect and does not shutoff if I stay under 3,600rpms?

    What issues have you seen cause MAP Hi fault? I did order a new IAC Valve and MAP sensor but I think something else may have caused it.

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