Cold running problem

[astroboy]

Hey guys, I just bought a 90 civic and it is in need of a bit of help. It had a mini me swap which blew up and was swapped for a d16z6 (and appropriate p28 ecu). The harness has been re-wired a bit by rywire to run obd1 (has a resistor box) but does not control vtec. The problem comes in on cold start...car idles well and a rev via wot the car will rev to red line no problem. When I give it partial throttle it will sputter and the rpm's will drop to between 200-500 rpm's. This happens below 2200 rpm's, above 2200 rpm's car will rev fine at partial throttle. When the car is warmed up (about 7 minutes and the temp is around 1/4 of full scale) everything works pretty well. there is still a very small amount of hesititaion but it is pretty much non-existant. I gave the car a tuneup when I swapped the new engine in (new plugs, wires, cap, rotor, pcv, and filters). I was thinking the 4 wire O2 sensor is not wired up properly/faulty or the tps is failing/has failed. Also the car is running rich...not sure why but I am thinking it could be related. Thanks in advance for the help! O yeah, also it isn't throwing any cel's/codes

[doitpropa]

i'd check the voltage at ur tps its .5 closed nd 4.5 open i believe if not adjust it to that nd try it

[wankel88]

when dpfi to mpfi you have to swap the 2 outside wires with eachother. Sounds like that might be you problem. Not sure tho.

[astroboy]

I just picked up the old engine so I am going to try to swap the tps to the new block. I don't think it is a matter of swapped wires because the car only runs crappy at partial throttle and it gets better as the car warms up.