So I'm not to fimiliar with the smog side of automotive. It WON'T pass the 15mph tests but PASSES the 25mph test no problem. It's to high on HC, CO and a GROSS POLLUTER on NO (Nox). The EGR valve was stuck closed but it freed itself when I manually pulled vacuum from it. I replaced the o2 sensor but what else should I be looking at? Should I be looking at timing?
PS. car is a 94 Honda Prelude VTEC OBD1
PS. car is a 94 Honda Prelude VTEC OBD1