I have a book on Bosch Fuel injection, and in the section on CIS it lists procedure (generic) for adjusting air fuel mixture on K-jet systems. It says to take a dwell meter or multimeter and connect it to the lambda control unit and measure the duty cycle of the frequency valve. 1st with the oxygen sensor unplugged(to determine 50%) and then with the oxygen sensor plugged back in. I understand this part, but even with Alldata, I am unsure where to plug the multimeter in or where exactly the lambda control unit on an 86 300E is. If someone could tell me, I would be quite appreciative.