I just bought a 1998 integra gs and i noticed they had swaped the engine with a B18a1 which by my understanding comes from 1990-1993 integras.i dont now why but they did. My question is will a b18c (which again comes from 1998 and up i think) ecu work with this engine.

 

The B18A1 came in the '90-'93, and the B18B1 came in the '94-'01 Integras.

They most likely swapped it out because it the B1 was blown... Or maybe it was stolen and the motor was yanked and they replaced it with the A1.

Is/was the motor converted to OBD2 to match the car, or is it OBD1?

The B18C is the JDM GSR. The USDM GSR is the B18C1, that came in the '94-'01 GSR Integra. There is also a B17A1 that is VTEC equipped that came in the '92-'93 GSR's.

A B18C1 (GSR) ECU will work, but it's not needed. It's a VTEC ECU (P72 is the ECU code), and the B18A1 and B18B1 is non VTEC. If you were to get a P72, it won't do nothing, and it would have to be remapped to work properly with your non VTEC motor. You also can't remap an OBD2 ECU, just OBD1, which is found in the years from '92-'95, and before that was OBD0.

I hope that covers it for you.

 

Thanks , How would i know if it was converted to obd2. Cause i dont know if they but the A1 and replaced the ecu or just converted it. Can you help.

 

Your car is/was an OBD2 car. After 1995 all cars went to OBD2. The B18A1 they put in was an OBD1 motor.

What does your ECU say on the little tag? Usual ECU codes are like P72, P78, P75, P2P, ect..

 

Im not sure but what code is the obd1 and is the obd2 compatible with b18a1

 

Take the ECU out, unplug it, and take a picture where the harness plugs into the ECU.

 

Take a look at this to verify what ECU you have.