He is an advanced question for all you folks pondering the mysteries of EHA/Lambda (for my 86 300E 5spd) I am wondering how the altitude correction takes place. I live at 6000ft and cannot find any official info on HOW the thing corrects, only that it takes place. Obviously, it has to correct for the lower o2 content of the air in the cylinder. Sooooo, 1) How is the correction made? a liner curve or just "steps" for certain altitude thresholds? 2) If I set my sytem up correctly, with altitude correction "in", how do I know it will work when I drive to a lower altitude? 3) Is there a way to bypass the altitude correction? Any thoughts, deep or otherwise, would be great! Thanks Scott