No start on Jeep engine swap-Flexplate problem?

:helpme:

I put a 1990 4 liter in a 1992 cherokee. I have the 90' flexplate still on the motor. Was there a change in flexplates from 90' to 92' that would cause a no start situation? Could it be because of the windows are spaced differently causing the spark to be every other compression stroke? I changed everything in the electonics to the 92' system except the flexplate. I appreciate any input. I can't get this thing to start!

yes. 90 flexplate only works with renix(87-90) ecu.

Oh man! Thats it. Your help is much appreciated. Thank you. I knew you pro's would have the answer. Glad I joined up.

Hey, is it easier to convert the 92' to renix rather than pull the motor and change the flexplate?