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  1. J

    5.0l MPI Single Alarm at 2000 RPMs and higher

    The mechanic checked the wiring and replaced the sensor first thing. I was told that the ECU was the same build as mine. SmartCraft water pressure builds normally while in gear from about 1psi at idle to about 4psi around 2000 RPM from what I remember. I have not run it this year yet.
  2. J

    5.0l MPI Single Alarm at 2000 RPMs and higher

    Standard cooling. Thermostat was replaced, and I assume the mechanic checked the housing while he had it open. Exhaust check valves have both been replaced. One of them was sticking causing a high temperature on the riser. This has been corrected.
  3. J

    5.0l MPI Single Alarm at 2000 RPMs and higher

    I have owned the boat since new. The only wiring mod I did was to pull power for the Lowrance that I added. How do I start the process of reopening the thread?
  4. J

    5.0l MPI Single Alarm at 2000 RPMs and higher

    It is definitely low water pressure. The Smart Craft gauge shows the pressure drop just before alarming and displaying the code for low water pressure. Additionally, my marina hooked the laptop up to it and confirmed the ECU is seeing the low water pressure to. I think I forgot to mention in...
  5. J

    5.0l MPI Single Alarm at 2000 RPMs and higher

    Engine temperature never rises, and no overheat codes. Inlet water hose was not reused. Original hose was black. New hose is a black nylon reinforced hose. The original hose did have a quick disconnect fitting in the middle. I have the same theory about the inlet hose collapsing. I have a...
  6. J

    5.0l MPI Single Alarm at 2000 RPMs and higher

    yes, they are original. I have taken the outlets off and the internals look good from the back. It was at that point that I found a lot of corrosion debris and opted to perform the citric acid flush.
  7. J

    5.0l MPI Single Alarm at 2000 RPMs and higher

    5 years of salt water, then freshwater ever since. That was why we went down the path of abandoning the drive water pickup early on in the troubleshooting. With everything that has been replaced and done, I have good water pressure at low idle to about 3000 RPM (develops about 5 psi at this...
  8. J

    5.0l MPI Single Alarm at 2000 RPMs and higher

    @Nord2903, I just found and read this entire thread. Were you able to find and fix the problem? https://forums.iboats.com/threads/4-3l-mpi-2007-searay-sport-185-single-alarm-at-20-rpms-and-higher.755100/ I have a 2013 Sea Ray with 5.0l MPI Bravo III and Smart Craft gauge package and the exact...
  9. J

    Transmission Failure?

    I have a 5.7L Mercruiser with Alpha I outdrive. Here's my problem. While towing one of my kids on the tube, I heard/felt gears "clunking". Initially I though I was hitting bottom, but as I pulled the throttle back to neutral the engine died. A quick look at the outdrive showed no strikes. I...
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