I just put a B16 in my 89 CRX Si a couple of weeks ago and it is failing its emissions check. Test/allowed/actual CO/15/64.30 HC/1.60/2.58 Installed new O2 sensors, dist cap, rotor and spark plug wires and ALMOST passed; Test/allowed/actual CO/15/16.42 HC/1.60/1.44 NOX/2.50/1.34 Compression is 190/210/205/210 and the ECU is/was not throwing any codes. No mods yet (no point in deliberately making it harder to pass ). Some of the other threads about emissions mention adjusting the air/fuel mixture, how is this accomplished? Also, I was wondering what the numbers for a properly running 1st gen B16 are supposed to look like (ie am I way off still)? Any help is really appreciated!