Hello I recently swapped in a b16a2 swap out of a 2000 em1 into my auto 97 civic dx im having some problems with my ecu..

At the time I had to order a obd2a to obd2b jumper harness so I ran a obd2a p72 (gsr) ecu which I got the car on the road running good besides running a little rich I finally recieved my jumper harness which I plugged into the p2t (si) ecu and now the car runs like total crap!! Low idle, bad acceleration, bogs, backfires, no power, almost wants to die when I shift into second gear I thought it might be bad ecu so I tried a obd2a ctr ecu and car runs the same with that ecu too. But once I plug in the p72 ecu it runs great! Is there something I did wrong in the harness??

I used stock auto harness repinned 3 wire to 2 wire iacv, added vtec wiring, added knock sensor plug, also converted 3 wire to 2 wire cfk plug
im missing the secondary o2 sensor and iat sensor would that affect anything??

Im stuck and have no idea why the car would hate the b16 ecu's but like the gsr ecu lol

 

Does the car throw any CELs with the SI ECU?

 

Cel is on but havent ran the codes I figured it was because of missing secondary o2 and iat

 

The missing IAT could make the car run poorly. There could also be other codes stored - you need to pull all of them and actually fix them if you want to accomplish anything.

 

Ya thats what im gonna have to do next is either drive it to autozone or find someone to come over with a scanner. One question. . Why would it run good with gsr and not original ecu? Does gsr not have an iat sensor?

 

I don't know, and you won't know until you pull the codes.

You don't need a scanner. Check the FAQ's sticky - you can do it with a paperclip.

 

Ive tried the paperclip trick on obd1 cars ill try it on this car Thank you for the help!

 

Scanned CEL last night I got: no secondary o2, no iat, 1337 (csf sensor) so I did the "ckf trick" from ff squad http://ff-squad.com/wp/?p=309

Now the car doesnt bog but it does idle pretty low ive tried adjusting the idle screw and it really doesnt do much could it be that im missing o2 and iat?

 

yes

 

Just fix those 2 items first and go from there.

 

Fix the two CELs then see what happens.

 

Anyone have a IAT sensor for sale?

 

Hit up your local junk yard - they should be abundant.