Engine swap

JoshBelton28

Member
:
mazda
I swapped an 08 mazda 3 2.0 L motor with a 07 mazda 5 2.3, I have one major problem, it won't crank or start...it is only firing on 2 cylinders out of 4. I kept the 2.3 ECU, expecting it would run the 2.0. What is the problem?
 
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