STFT are oppposite of each other and seem to be doing a criss cross pattern. At times Bank 2 STFT flat lines at -13.3%. O2 readings don't seem to following each otherr either.
One would think there is an air leak somewhere.
Being cruise is the bulk of time logged which is in the 18-2200 rpm range, this is where I am noticing the behavior. Obiously , they go out of play in closed loop operation.
Thing tested:
Switch O2 sensor pins on ECU . made things worse
New Denso O2 sensors (4th gen Camaro in place of the Bosch 13444) units - no notable difference
WB readings are within 0.5 of each other on each bank
Performance is smooth, WB readings are seemingly accpetable. Still dialing things in however.
Havent checked sensor side vs ecu harness side of the connectors yets to confirm wires are not crossed.
Is this something others have expireneced? If so, what resolved it? Trying to search for ideas where/ what to tune/ address, ect.
A short scan is atached. Most scans logged have similar patterns in respect to the question.