I have been reading a good book on Bosch Fuel injection by Charles O Probst and Bentley publishers. I am at the chapter on KE injection that my 1992 Mercedes 300-E has. One of my questions is they show two air flow sensors one is a down draft and one is updraft. Can some one tell me which one I have?

Second question is it seems the fuel mixture adjustment has been sealed by the factory so you can not make adjustments. I have read several places were the small ball inserted in this adjustment is drilled out. what is the opinion of other owners who found this ?

Bob Geco