need help. i recently picked up a 91 crx si thats been d16y8 swapped. cylinder 3 is not working. compression was great at 190, new plugs, and injectors are working without issue. im running obd0 distributor, ecu, and injectors. any idea what the problem is?

 

190psi seems high. That's good though. How do you know the injector is working? Do you have spark on cyl 3?

 

How are you determining that #3 is not working? Are you getting spark on #3? If not, check the distributor cap and the plug wire resistance.

If there is spark, next thing I'd do is verify timing, and then a leak down test to rule out any valve issues. Has the valve lash been checked recently?