[GRUF78]

For the tuning gurus out there....Datalogged the car for about 10 mins briefly.

Tuner had the following comments:

Bank 1 (Drivers side) is showing signs of over fueling on decel. When the engine goes into decel both banks go rich briefly followed by bank 2 going back to normal while bank 1 stays in an enrichment state.

You can see bank 1 (circled in yellow) is adding 14.8% fuel while bank 2 (circled in red) is subtracting 0.8%. These should really be following each other. You can see this in the graph section (circled in pink). Bank 1 (purple) flatlines at 908 millivolts while bank 2 (light blue) falls back into the closed loop oscillation sequence.

I can't really put my finger on what causes this but I can say it's not normal. I tune 5-6 of these weekly and never see this type of behaviour.

Thoughts?