Heya all, wondering if anyone else has had a similar issue or knows whats going on here...

Engines recently been rebuilt and put back in (everything is running sweet, temps and pressure all good) however after the first run or 2 i noticed that ecutalk wasnt picking up a reading from the stock o2 sensor and the car is running rich. We have changed the sensor twice, then checked the wires for voltage signal which is spot on all the way up to the ecu pinout.

Equally no fault codes are showing and ecutalk did read a signal on the first few fire ups of the engine running so could this just be a coincidence that it happend right after the engine rebuild or could I have got an earth or something wrong and screwed something up?

Any advice or suggestions highly appreciated