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  1. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    The boat still had more power with the TMAP disconnected. When I had the 6.2 ECM on the boat and disconnected the TMAP it had more power all the time. Now I have the 5.7 ECM and when I disconnect the TMAP, most of the times it has more power but I have noticed that other times it POPs alot...
  2. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    Yes the fuel pressure stays at 40 pounds at idle end at wide-open throttle. I am pretty much grasping at straws right now
  3. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    do you think I should check the fuel system to confirm that nothing is being blocked? I was going to have someone test the injectors. i was thinking to start at the injectors and work my way back to the tank.
  4. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    what does RTN 5V mean in the diagram?
  5. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    i just spoke with my mechanic about the reading on the TMAP and he said that is a normal reading. He said it is accounting for the air intake temp & the block temp.
  6. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    Correct.
  7. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    Just so you know, those readings where taken after we took the boat for a ride. Not sure if that makes a difference.
  8. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    I needed that good laugh. would this be the map sensor giving this reading or another sensor?
  9. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    Just so I know, what would be a correct temp for the manifold air temp?
  10. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    why not, it is hot in NY. LOL it is a dry heat.
  11. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    should they at least be close if not the same?
  12. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    yeah I was just looking at that also. I saw him take the screen shot while the boat was at idle. I guess another well qualified mechanic. OMG!!
  13. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    Yes the mechanic that came down had the software on the laptop and we took the boat for a ride. He did not see anything abnormal. He only gave me 2 screenshots.
  14. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    I really have to say thank you for all your help. I am not giving up yet. I have a call out to the original owner to see if he can shed some light.
  15. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    I meant to say Knock Sensor. As you can see this is just beating me up.
  16. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    Question: Can any of these sensors limit power on my motor? 1: NOC Sensor 2: Gear Indicator I reached out to the Mechanic that looked at the motor last week and he pretty much told me there is nothing wrong with the motor and he would not even know where to look next. He just did not want to be...
  17. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    I would need to take the motor out correct?
  18. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    Update: I went back to the prop dealer and they are saying that with these props and motor the boat should jump out of the water. He also mentioned something else is going on with the motor that I am 1k RPMs off. I can only make about 3600 when I should at least be 4600. Well back to the...
  19. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    I measured the stroke and it is 3 1/2” which is probably 3.48
  20. W

    Mercrusier 350 MAG MPI - RPM issue under a load

    How can I tell if the original motor was a 6.2L? I still have the old block.
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