Strokedluxury

I have a 1996 impala ss with a 6.0 LS swap. The ECU is from a 2004 Sierra. It is a blue green model ECU. However, the shop used a white square O2 sensor harness and sensors. But I see the Denso sensors for that car is a black triangular sensor. How do I fix this? Because my car stalls in closed loop and running rich. My Short Term Fuel Trims are Maxed out at 25%. I dont know much about datalogging but it seems my car is adding a ton of fuel. Please weigh in on your thoughts.
https://youtu.be/GYSsh-UiioY

1964SS

iTrader: (1)

Sounds like they used the downstream o2 sensors. Did they do the harness? I would make them fix it. Hopefully they didn't remove the wiring for the upstream sensors which are the ones you want to keep.

Strokedluxury

Current performance did the harness, but im sure they must have told them the harness was for an older 6.0 vehicle. Bc it makes no sense for the connectors to be incorrect otherwise. It seems this is going to be a huge pain to fix, and im sure it isn't as easy as cutting the connector off and soldering a new one on. Considering they are grounded different.

ss454327

iTrader: (10)

You can't swap to the o2's that plug into the harness?