Ecu questions

So i own a 90 hf crx, the guy who had ti before put a 90 si engine in it im tryin to roubleshoot whats wrong with it, it throws the code 20 which is electric load, but i was wondering would the hf ecu run correctly with the si engine?

Yeah the hf ecu should run your engine. However, it is not going to be run optimally.

5500 rpm rev limit sucks :(

you need a 88-91 PM6 or 88-89 PG7