Cruising datalog shows BLM's mostly flatlined at 108 with INT mostly in the 118-128 range but the Wide Band is reading way lean ... if I lean it out by fuel pressure adjustment the WB goes leaner ... light throttle application drives the WB to 1.25 - 1.45 range .... the NB O2S is heated and new with same readouts as the old ... no exhaust leaks and the plugs look good .... changed wires too thinking mis-fire on the NB side ........

 

What are the narrow band o2 sensor offsets in the bin? It could be trying to command a much leaner air fuel due to milivolt offsets, but lambda 1.25-1.45 is extremely lean. Is the wideband calibrated properly?

 

Where to pick up O2S offsets in the bin ? I'm using 32B / Tuner Pro ... Wide Band was re-calibrated on Saturday ...

 

there are only a few o2 sensor tables but I dont see it in the 32B xdf file. I use 6E mostly and the expanded 6E xdf. There are some high and low o2 offset tables you can adjust the swing point to target a different air fuel ratio.