I recently installed a b20 into my civic and converted the car from auto to manual. Currently I am running the car with a auto p75 obd2 ecu. Runs ok besides for a couple cels. Cel 54 and 70. When I try to convert to obd1 the car will idle rough and die. I don't get a cel with the obd1 ecu. I have checked and adjusted the tps swapped map sensors cleaned iacv and fitv. Not really sure what to try next. Any help would be appreciated.

 

what obd1 ecu are using

 

I've got 2 p75 and pr4. Does same thing with both.

 

You looked for vacuum leaks and checked all your grounds?

 

Yeah car runs good obd2 but once hook up conversion harness and ecu it will start and run but if let off the gas it will shut off. No cel lights

 

You should go over the wires near where you did the auto to 5 speed conversion. Maybe you pinched or cut something by accident.

Where did you get the jumper harness from to run the B20 swap?

You are OBD2a right?

B20 engine with Integra 5speed tranny, right?

So, the jumper harness goes from you stock civic ECU plugs (4) to integra

ECU/TCU , right?

Did you do the 3 to 2 wire IACV conversion?

Also, did you do the CKF bypass?