I have a 1987 TBI 350 with long tube headers. I bought a harness off Ebay and to upgrade from a 1 wire O2 sensor to 3 wire to help go into closed loop in the winter. The new sensor stays between about 440 and 460 mv and the truck won't go into closed loop. The sensor is heating up and its getting 12 volts. Anyone else have this issue? Any recalibration or "reset" needed? I am also running EBL Flash. When I put the 1 wire sensor in, the truck will run closed loop.

The 3 eire sensor is p/n 0258003077 Maybe I shoild use another?