switching from a mefi3 to mefi4
10-24-2006, 08:18 PM
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switching from a mefi3 to mefi4
Hello everyone
Just wanted to check if someone could help me out here
I repowered my ebbtide deck boat from a 5.0 to a 5.7 last winter
Also went from using a mefi 3 tbi fuel injection for mercruiser to a mutiport fuel injection mefi4 from marine power
The 5.0 was a 1999 with a mefi 3 computer mercruiser
the marine power is a 2000 with a mefi 4
The problem I'm having is going into reverse after being in forward.If I shut off the engine it works fine, but is very hard to get in reverse running.I never hooked up the shift switch on the shift plate when I made the change over.Come to find out this is what kills the engine quickly to let it shift.Problem is the harness I got with the marine power injection didnt have a place to plug the switch in.Does anyone know if one of the wires on a mefi4 marine power computer for a 5.7 is for the shift interrupt switch
Other than that the boat runs great, but it sure is hard to dock
Thanks in advance
Just wanted to check if someone could help me out here
I repowered my ebbtide deck boat from a 5.0 to a 5.7 last winter
Also went from using a mefi 3 tbi fuel injection for mercruiser to a mutiport fuel injection mefi4 from marine power
The 5.0 was a 1999 with a mefi 3 computer mercruiser
the marine power is a 2000 with a mefi 4
The problem I'm having is going into reverse after being in forward.If I shut off the engine it works fine, but is very hard to get in reverse running.I never hooked up the shift switch on the shift plate when I made the change over.Come to find out this is what kills the engine quickly to let it shift.Problem is the harness I got with the marine power injection didnt have a place to plug the switch in.Does anyone know if one of the wires on a mefi4 marine power computer for a 5.7 is for the shift interrupt switch
Other than that the boat runs great, but it sure is hard to dock
Thanks in advance
10-25-2006, 12:02 PM
#2
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Re: switching from a mefi3 to mefi4
I don't have a service manual for Marine Power engines, but I have on for Indmar engines which I believe are the same. It does not show a shift interrupt input to the ECM on a MEFI4 system.
I believe that your engine uses a Delco EST distributor. If that is the case you could use a normally closed interrupt switch wired to open the Ignition Control circuit (pin J2-31 at the ECM) when activated. That's how Mercruiser did it on some Alpha/EFI engines.
Dave
I believe that your engine uses a Delco EST distributor. If that is the case you could use a normally closed interrupt switch wired to open the Ignition Control circuit (pin J2-31 at the ECM) when activated. That's how Mercruiser did it on some Alpha/EFI engines.
Dave
