Thanks Stevebfl and Duke.

Will setting to 55%, using my reversed convention, result in a more lean mixture?

Also, one other point of note. When I monitored lambda with the O2 sensor disconnected, I saw a result of 49.9%, and it did not change.

Overall, the engine is running much better. I am still experiencing some roughness at idle. Also, low power and poor mileage was the primary reason I started down this path. I'm not sure if I am still experiencing low power, as I have only tested the car around the city. Acceleration from a start seems fine, but still not sure about hill climbing around the streets of San Francisco. I'll have to watch is for a few days and see what I experience.

Thanks again.

__________________
Steven
1989 260E (276K miles)
1995 E320 (50K miles)