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Old 03-22-2013, 08:25 AM   #1 (permalink)
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Question EHV, W124

Strange EHV actions. This is my first post, although I have read many of the entries over the past 20 years. Right now I have a 1989 300 TE with 288,000K miles and have recently replaced the head gastket, water pump. The car set for 4 months b4 I finished it. The problem is that the car starts/runs perfectly until I connect the plug to the EHV, which immediately causes the motior to stall and the auxsillary radiator fans to start.
I checked the "all seasons temp sensor",, the EHV, neither made a difference. Another strange thing was that the interior light would not go out when the door was closed. ( yes, the light switch was fully forward. This has started working correctly. In fact the cars rins like a sewing machine at all speeds, only occasionally a very minor hunting at idle.
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Old 03-22-2013, 09:01 AM   #2 (permalink)
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Do you mean EHA?

I am probably the only person who does not know what the "EHV" is.
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Old 03-22-2013, 09:38 AM   #3 (permalink)
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Electro Hydraulic Valve, located on the firewall side of the FD (fuel distributor) As far as I know it works with the off-idle-contact switch, located on the fuel likage. It lowers the fuel pressure for a more precise idle ( I think.) All was working purfectly b/4 overhaul. Turns out it was a bad radiator, not a head gasket. Vlotage is good, new battery. . .
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Old 03-22-2013, 11:04 AM   #4 (permalink)
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There is no such thing as a EHV on a W124. The device on the side of the fuel distributor is the EHA (Electro Hydraulic Actuator).
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Old 03-22-2013, 04:29 PM   #5 (permalink)
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OK, Thanks! Any idea as to the connection between the EVA and the auxsillary radiator fan? (The fan in front of the radiator) or why the fan would activate when the EVA is plugged in. As I drive it more I noticed the Auxsillary fans will occasionally come on as the engine warms and then shut off again. I am thinking relay, or maybe the climate control regulator ( not the real name, but fuctional description) I tried turning on the bright lights, AC motor, put in gear; the idle did not vary. 14.2 volts maintained. Does not turnover a complete revolution before starting, Rarely take two tries to start when cold. More pep than when I bought it. (80,000k)
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Old 03-22-2013, 04:33 PM   #6 (permalink)
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You have a bad coolant sensor,top of head,center one,2 prong
only time the twin fans come on is when a/c on high speed max cooling,and when engine temp gets to 105F,bad sensor,mine did that same thing,$30 part
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Last edited by lowesguy; 03-22-2013 at 04:37 PM.
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Old 03-22-2013, 05:02 PM   #7 (permalink)
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Thanks, I will get another one tommorrow and let you know. I changed the two-prong plug at the end of the head, but not the center two-prong.
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Old 03-22-2013, 09:26 PM   #8 (permalink)
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You changed the green top one at the back of the head? That's the coolant temp sensor used for the injection system.
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Old 03-22-2013, 11:03 PM   #9 (permalink)
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EHA = Electro Hydraulic Actuator (MB terminology)

EVA = Extra Vehicular Activity (NASA terminology)
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Old 03-23-2013, 06:40 AM   #10 (permalink)
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Changed the green two-prong on end and now have replaced the two-prong in the center and, just for laughs, I changed the sender unit for the gauge. No change!! Started right up this morning! Any body know where I can get a eletric schematic for the injection system. I have tried the ones on the board, but the links do not work.
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