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  1. J

    MerCruiser MCM 5.0L MPI Randomly Shuts off at higher RPM

    Well, here we are a full year later and I finally have the answer to my problem. Posting just in case someone else ever runs into the same issue. Mercury issued a service bulletin back in 2003 (attached) pertaining to No Start, Engine Miss-Fire or Engine Shut-off Conditions. I shorted out the...
  2. J

    MerCruiser MCM 5.0L MPI Randomly Shuts off at higher RPM

    alldodge it was full and started pouring out as soon as I started tilting it to empty into a jar. Do I check that pressure while running at 3000+ RPM or at idle or both? Thanks for the tips!
  3. J

    MerCruiser MCM 5.0L MPI Randomly Shuts off at higher RPM

    I have a 2002 MerCruiser MCM 5.0L MPI. The serial number is 0M520231. When I bought the boat about three years ago from a dealer and it was having the same problem. It will idle and run at lower RPM without any issue. However, when I get to 3000 - 4000 RPM range it will randomly just shut...
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