If the ZC block has PM7 stamped all over it and on the cam gears and everything can you still use a PM6 Si ECU? Could this be causing my code 4 or do I just need to break down and buy a distributor?

 

how did you wire the dist? Code 4 is for the CYL/crank sensor. Might just be a wiring criss-cross.
You can use either ECU, mines run off of both, but the Teg one feels better. It has more revs to it for the occasional race.

 

i have the pm6 which is the crx si ecu....failed emissions with it so i'm not sure how much of a difference it makes to have the right ecu.

 

You can use a PM6 (88-91 Si ecu)

You can use a 88-89 PG7 (88-89 teg ecu )

And if you can get one imported from Japan a PM7 ecu

re-check your distributor wiring for the code problem.

-Joel