zx6rr33

It did have prochargers and the ECM's were remapped. I have the mefiburn software and have reloaded them with the E930 mercruiser 350 mag mpi map. I'm not sure about the MAP sensors though. How would I know if 2 bar sensors were in there instead of the factory ones? The bog happens in the last 1/4 of the throttle travel or about 4500-4600 rpm.

zx6rr33

The ECM's were tuned for prochargers. I have reprogrammed them with the MEFI burn software package and the now have E930 (stock) mercruiser maps loaded. I don't know if they have 2 bar MAP sensors. What would I look for to figure that out? The bog happens in the last 1/4 throttle travel and around 4500-4600 rpm.

Shag555

I have essentially the same boat and stock motors... My stat is 170. I would change that 120 deg one if i were you because supposedly the computer runs the engine rich if cold. 2ndly, stock props are Mirage 23P's... With a prior Procharger setup, i would think theres a set of 25P's on your boat.

What'd you do with the pro charger setup???

zx6rr33

Both procharger set ups are currently on the shelf. Props are 23P Mirage pluses currently. I can adjust the enrichenment circuit so that the cold choke turns off earlier but I don't think that would cause this bog.

tunertech

hook up scanner pro and look at the MAP KPA at idle or the voltage.. If it's the correct MAP sensor it should be reading about 60. You can change the bin file by simple checking the 2 BAR MAP variable in the stock tune. It doesn't care what you have on it so long as the program and the sensor type match.

zx6rr33

Pulled the MAP sensors tonight and had a look. For some reason both engines have GM 3 Bar map sensors. I ordered two 1 bar sensors. I presume this could cause the issue with a stock 350 Mag Mpi base map. I really hope that I haven't hurt the engines....

zx6rr33

Made a mistake on those MAP sensors. They were indeed 1 bar MAPs so I'm still searching for the problem. Should I take it to the dealer and have them check the fuel injectors? I'm running out of ideas.