Mercedes KE-Jetronic - The EHA (Electro-Hydraulic Actuator)

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The part that receives the output signal as current signal from the ECU so that it can fine tune fuel to air ratio in any moment depending on the condition whether it's normal driving, start up, warming up, idling, cutoff, accelerating, full throttle driving or the lambda phase. Based on the working principle nozzle/baffle plate with a permanent magnet and an electromagnet that is activated as it receives current from ECU magnetic fluxes are being created so that they moves the baffle plate which closes fuel flow and increases or decreases the pressure on the differential valves. The part as such can very very rarely fail. It has also an adjustment screw hidden by a brass screw(allen screw 2mm). This screw increases or decreases the difference in pressures(0.4bar). Usually it comes to that either you have a leaky EHA(2 green O-rings in the distributor to be replaced), no current flowing to the EHA(if the diagnosis gives 9 pulses) or bad wiring harness. In the video you will see the specifications for the EHA how to measure it with a multimeter.
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Timecodes
0:00 - Intro
0:04 - 0:36 Joking at the beginning
0:37 - 0:44 The Electro hydraulic Actuator
0:46 – 0:56 About the video
0:57 – 1:41 The basics about the EHA
1:42 – 3:15 Detail explanation
3:16 – 4:15 About the differential pressure adjustment
4:16 – 5:13 Different ways of setting the differential pressure
5:14 – 7:49 The EHA components
7:50 – 8:28 Does the EHA go bad
8:29 - 9:48 The issues with EHA
9:49 – 13:10 The importance of the EHA
13:11 – 14:06 The 7 phases of the engine
14:07 – 14:32 A video about driving uphill
14:33 – 15:25 About driving downhill
15:26 – 17:14 Two videos on the cut-off phase
17:15 – 19:17 About the full throttle driving
19:18 – 20:16 The conclusion and the specifications
20:17 – 20:53 Like, share, comment, subscribe
20:54 – 21:29 A smiling girl

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"