For the life of me I could not find anything remotely like the C O adjustment screw in the photos in my Clymer, or the illustration in my BMW repair manual. Man I looked real long and hard. Notta? I am guessing it has been superseded by technology in my 94 K11 and is adjusted by the computers in the motronic etc? Is there an adjustment screw, and if so, where is it? I am trying to lean out my mix to the cylinders.