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--- articles:cis-e_fuel_adjustment [2021/08/22 09:35] – [Notes and Exceptions] john5788
+++ articles:cis-e_fuel_adjustment [2021/12/04 03:51] (current) – [Adjusting EHA Valve] john5788
@@ Line 34: / Line 34: @@
 At this point, the control unit should be in the diagnostic mode for outputting the fuel trim as an on/off ratio. After this, when the engine is started, the CHECK ENGINE LIGHT should be illuminated.
-==== Notes and Exceptions ====
+**Note:** Some ECUs do not require being put into a diagnostic mode and will begin outputting a duty cycle reading after 30 seconds of idle time after the engine has been started.
-  * 1986 190E 2.3-16 - This ECU does not need to be switched into a special mode. The on/off ratio will be available after the engine has been running for 30 seconds.
-  * 1993 190E 2.6 - This ECU does not need to be switched into a special mode. The on/off ratio will be available after the engine has been running for 30 seconds.
 ===== Reading the on/off ratio =====
@@ Line 72: / Line 69: @@
 ==== Adjusting EHA Valve ====
+<grid>
+<col sm="6">
+  - Remove EHA valve from fuel distributor
+    - Unplug wire connector
+    - Remove 2 screws holding EHA valve to fuel distributor while covering the EHA valve with a rag to catch fuel that will squirt at your face
+    - Pull EHA valve off fuel distributor, noting the 2 green rubber sealing rings.
+  - Remove the screw cover with a flathead screw driver
+  - Use a 2mm allen key to turn the adjustment screw inside the EHA valve with small adjustments (1/4 turn at a time)
+    - Turn clockwise to **enrichen the fuel mixture**. This **decreases the duty cycle** or **increases the voltage**, depending on whatever method you are using.
+    - Turn counter-clockwise to **lean the fuel mixture**. This **increases the duty cycle** or **decreases the voltage**, depending on whatever method you are using.
+  - Reinstall EHA valve
+</col>
+<col sm="6">
+<grid>
+<col sm="6">
+<thumbnail>
+{{ articles:eha_valve_screws.png?300 }}
+<caption>EHA valve screws</caption>
+</thumbnail>
+</col>
+<col sm="6">
+<thumbnail>
+{{ articles:eha_valve_seals.png?300 }}
+<caption>EHA valve seals</caption>
+</thumbnail>
+</col>
+<col sm="6">
+<thumbnail>
+{{ articles:eha_valve_backside.jpg?300 }}
+<caption>EHA valve screw cover</caption>
+</thumbnail>
+</col>
+</grid>
+</col>
+</grid>
 ==== Adjusting Fuel Distributor Screw ====
-If there is a steel plug  present, it needs to be drilled out first.
+If there is a steel plug  present, it needs to be drilled out first. Engine must be idling for this adjustment.
 <grid>