Mercedes Ke-Jetronic - Airflow meter explained in details(for those who want to know more)

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What am I talking about?
My topic is the KE-Jetronic injection system which I try to demystify as much as I can.
For all of you to understand the system in brief - Developed in 1973 and being mounted into cars up to 1993 as it went in history. But why these to letters!?(KE) K(from German "kontinuierlich" meaning continuos, without interruption) the MECHANICAL injection system on which the fuel starts flowing from the fuel tank sucked by the FUEL PUMP and delivered to the FUEL DISTRIBUTOR which sends fuel to the INJECTORS while the majority of it flows through the FUEL PRESSURE REGULATOR through its return line back to the fuel tank again. The letter E(electronic) has to mark the electronic sensors (the developement starting from early eighties) which had to inform the ECU about the current state of the engine so that the ECU(Electronic Control Unit) then could create current signal in mAmp(miliampers) and send it to four crucial components for the system - the EHA(the electro-hydraulic actuator,a unit consisting of a magnet, an electromagnet and a baffle plate) which had to fine tune the engine in each of its phases, the ICV(the idle control valve), the unit which was predicted for the engines perfect idle, the X11(the diagnostic socket) where the duty cycle(the ideal mixture) was adjusted and the X11/4(the code reader) - the socket which from any codes were read if present using an OBD1 scanner.
An extraordinary injection system which could be fully repaired in your own garage using a multimeter and a pressure gauge only for its fine tuning, together with some common tools.
"Happy Mercedesing"

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In this video watch everything about the airflow meter. I will be answering some doubts which I got as questions. Find out what is an airflow meter, what it consists of as a whole unit, what the mixture screw does, how it's readjusted, does is have to be readjusted at all if it has never been touched before and if yes what should you do and how do you have to adjust it properly, if it comes to detonations what you should do, what happens actually as you screw the 3mm allen in or out and how does it look like, in fact why is it that the lever becomes stiffer or why it gets more gap when deflected. For how much you should be turning the mixture screw in or out and if the car starts shaking should you turn the mixture screw or there are some other priorities instead of turning the mixture screw. You will see then why the K(E)-Jetronic is so reliable system. In fact if any issue happens with the electronic, the KE starts behaving as a fully mechanical K-Jetronic system - it needs no ECU, lambda, EHA or potentiometer to run. The car won't let you down, it's just going to have a higher fuel consumption and won't work as steady as if the E components were there but the engine won't stall - it is going to drive you to your home. If out of any reasons you have to make adjustments here on your airflow meter you are going to do it once and never again. The only downside on this system is the potentiometer which has to be checked/readjusted each 90k miles/150 km. Once set as it has to be the KE-Jetronic is a system you won't have to touch anything on for at least 10-15 years(depending on the mileage you make).
One happy reliable system, one happy owner make it - HAPPY MERCEDESING!!!!!!