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Recent content by SeaRayJosh

  1. S

    2004 4.3 MPI surging once warmed up. I don't know what else to try.

    Hope that solves your problem! Happy boating.
  2. S

    2004 4.3 MPI surging once warmed up. I don't know what else to try.

    Hey there sorry to hear about your issues. My problem turned out to be the crank sensor. It was intermittently bottoming out. I added a second o-ring and no problems since. For your issue, I would suggest plugs, wires, and cap/rotor. Good luck!
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    2004 4.3 MPI surging once warmed up. I don't know what else to try.

    I just looked back at it and you are correct. that is strange for sure. It shows voltage but not position. Since the problem had started, I had switched the TPS with the other motor, to no change, so I wonder if there is a connection issue, assuming if that could cause the problem. It could...
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    2004 4.3 MPI surging once warmed up. I don't know what else to try.

    Thanks AllDodge. I have attached 2 screenshots. I would think a vacuum leak would offer a consistent issue, vs one that appears and then disappears. I did try the stethoscope method with a piece of vacuum hose and could not identify any leaking areas around the intake or throttle body.
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    2004 4.3 MPI surging once warmed up. I don't know what else to try.

    Took the boat out this past weekend to finally put the remaining break-in hours on the motor after a very long process of fixing. Got out of the creek, started the stbd motor up and problem back. Unbelievable. Pulled back to the dock, and switched the thermostat housing with the port motor. Went...
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    2004 4.3 MPI surging once warmed up. I don't know what else to try.

    Finally! Problem fixed. After replacing or swapping every single sensor on the motor including the ecm itself, tried that twice by the way to no avail, I hired a local guy who came out with a heat gun, rpm gun, and timing light. Unfortunately he didn’t have a computer. After his tests he said...
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    2004 4.3 MPI surging once warmed up. I don't know what else to try.

    Hi Fun Times, thanks for the info. The replacement motor came from ATK. This is the second longblock I have ordered from them. first one last year. For the first motor replacement, I swapped out all existing electronics including the ECM and did not have any issues. I would expect the same on...
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    2004 4.3 MPI surging once warmed up. I don't know what else to try.

    Another day on the boat without resolution. This time I swapped alternators and crank sensors. Ohmed out all the sensor plugs back to the ecm plugs. Bypassed the anti-siphon solenoid. I can’t come up with anything else to try. Any advice or suggestions would be appreciated.
  9. S

    2004 4.3 MPI surging once warmed up. I don't know what else to try.

    Hi All, new to this forum, I have been scouring the internet for an answer to my unusual motor issue. Maybe someone here can shed some light on this. Here is what is going on. I have a 2004 Sea Ray w twin 4.3 Mercruiser mpi’s. Engine serial # is 0M662545. Problem is the engine is surging. It’s a...
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