I have a 1991 crx si, it had a obd2 gsr in it, it ran great and drove fine. Well one night it blew up, so I got a replacement engine (obd1 gsr) , hooked everything up and swapped it in, now runs like it has a huge miss fire and has code 22 and 5, vtec pressure and map, I don't see why it could be the map, it worked fine on the old engine. Any ideas on where to start looking? changed wires, timing is all good too

 

is the MAP sensor firewall mounted or throttle body mounted? its possible the vtec pressure switch is bad on the new motor. try swapping in your old one.

 

It's a TB mounted map and the new vtec solenoid doesnt have the spot for the vtec pressure switch so its just unplugged

 

thats why your CEL is on for you vtec oil pressure switch. all you have to do is splice the pressure switch wire (stock color is blue/black on engine side) to the vtec solenoid. this will bypass the oil pressure switch.

 

Thanks I'll try that, but i need to fix the idle, ill post a video, but its running rich, shooting flames even

 

then after it runs for 30s the idle climbs very high and i shut it off before it get to high