Mercruiser 7.4l Horizons ECM

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by jzanthony, May 22, 2021.

  1. jzanthony

    jzanthony Active Member

    276
    Aug 17, 2015
    Port Lambton, ON Lake St Clair
    400 Sedan bridge 2000 , 2019 SeaDoo RXT230
    Cummins CTA 8.3 diesels
    Any help appreciated need replacement ECM mine died day of sale, started for water test ran great. Now ECM is dead. Removed port and installed on Starboard and its good so believe 100% ECM issue.

    I did find one for 5.7L and apparently they can be flashed for different maps. Would love to find direct replacement

    If anyone has a lead on where to locate would be greatly appreciated

    Thanks Jamie
     
  2. bfernald0

    bfernald0 Active Member

    227
    May 18, 2020
    Marina del Rey, California
    340 Sundancer 2001
    8.2L Mercruiser ECT Horizons
  3. msballin

    msballin Member

    251
    May 30, 2008
    Islip Terrace, Long Island
    2000 340 Sundancer
    Twin 7.4L Horizons w/ Hurth V-Drives
    Dealing w this currently. I've been told they're the only reputable one in the country. https://obd2allinone.com/ecmrepair.asp
     
  4. jzanthony

    jzanthony Active Member

    276
    Aug 17, 2015
    Port Lambton, ON Lake St Clair
    400 Sedan bridge 2000 , 2019 SeaDoo RXT230
    Cummins CTA 8.3 diesels
    Yes told the same by Mercury, I did have a small problem where I gave engine serial numbers and told them they were 7.4 merc horizons but ECM was flashed for something else.
    ECM sent back and is programmed fingers crossed correct and will be back in boat tomorrow. This Boat is Sold to honestly the most patient and understanding buyer I've ever met so hopefully its all done tomorrow and boat is on way to new home.
     

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