502MagMPI conversion to Carb
#1
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502MagMPI conversion to Carb
I have a 1996 502MagMPI. The MPI (MEFI-1 with cool fuel) system has frustrated me all summer to the point where I’m just about ready to rip it off and bolt on a Carb.
My questions are can I use the existing engine wire harness and distributor without major modifications?
I would assume the IC module internal to the distributor can do the timing advance. What do I do with the ECU? Just unplug it?
What do I need to change on the engine wire harness?
I have the carb and intake off a 1996 454Mag and from what I can tell from the Merc manuals, they were the same for the 502Mag with just different jets and spacer.
I’m hoping I just need to buy an electric fuel pump to feed the carb and be good to go.
Help Please!
I know this has been done before…
Thanks,
My questions are can I use the existing engine wire harness and distributor without major modifications?
I would assume the IC module internal to the distributor can do the timing advance. What do I do with the ECU? Just unplug it?
What do I need to change on the engine wire harness?
I have the carb and intake off a 1996 454Mag and from what I can tell from the Merc manuals, they were the same for the 502Mag with just different jets and spacer.
I’m hoping I just need to buy an electric fuel pump to feed the carb and be good to go.
Help Please!
I know this has been done before…
Thanks,
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Patrick
Patrick
#5
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I rather not buy a new distributor this year; maybe next year.
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Patrick
Patrick
#6
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#8
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The distributer has no provisions for mechanical advance as this is done completely by the computer program,you will need a different distributer but its not the end of the world,just a std hei would work then set the advance curve,Smitty
#9
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thats what I was thinking as most EFI setups manage the advance curve as well, but your fuel pump runs way to much pressure for a carb, could add a regulator but the cost and the plumbing I would just by a std elec pump and be done with it...also if you need a dist I have complete marine setup, everything I'll sell for $100 if interested and a new holley 7 psi fuel pump as well $ 50 Rob [email protected]
#10
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Yes, the ECU controls when it's working right. My original ECU no longer will comunicate with the IC modual but will still control the injectors. F'n black box...
I know I'm being cheap guys, but I don't want to spend a bunch of cash on stuff to convert to a carb when I may just go back to EFI next year...
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Patrick
Patrick