I don’t know about the Mighty Max MPI, but what makes you think is bad?, is the clicking noise coming out of the Mpi relay?
Do you have run an overall test to see what is getting or what not, like fuel or spark, I know it was running before but things can happen while working on it.
Does the fuel pump turns on right after turning the switch to the on position.
Let us know what makes you think the sensor is no good.
I have new ptu sparkplugs wire coils new battery rebuilt ecu from ecm new rc engineering injector's 440cc new fuel pump and filter new pressure regulator and the only the left would be the mpi
It started and died but then just cranks
Plus the mighty Max did have a 4g63 and 3000 variant had one also but I also saw the mpis for them and appear to be the same externally but interanl different or not but would mitsu make one type and run with it
Ok this is how things gets easier to find.
Check to see if you have fuel, you can hear the fuel pump kicking in when you turn the key to the on position (no cranking) it will turn on for 3,5 seconds, then it will turn off, if you don’t here this noise, then Something is wrong with the fuel system, even if it was working correctly before.
Maybe you have done this before, but because you have a new problem, you have to start all over again.
There is frustration to start all over again , I know, believe me I being there many times, and the only easier thing to find the problem is go through all over again.
Check for fuel,
Check for spark,
There is more to check but that’s one of the things that can cause your problem.
I always have carburetor cleaner, that’s very handy to check for fuel, I just spray a bit in the intake and rank it, if it starts, I know for sure is fuel related.
So the mpi is same as 3000 Galant and mighty Max
But I have yet to get it till Tuesday
So I decided to toss back the sacricial 255 walbro pump back on and it started right up no delay and was running fine