EHV, W124 - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 03-22-2013, 08:25 AM
BenzWorld Junior Member
 
Date registered: Mar 2013
Vehicle: 1989 300 TE 280,000♪ previously♪ 1978 450 SEL 6.9♪1980 500 SE (Super Steel)♪
Location: Suncoast, Florida
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
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.
Docatari is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 03-22-2013, 09:01 AM
BenzWorld Veteran
 
Date registered: Jul 2007
Posts: 687
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Do you mean EHA?

I am probably the only person who does not know what the "EHV" is.
ds190 is offline  
#3 (permalink) Old 03-22-2013, 09:38 AM
BenzWorld Junior Member
 
Date registered: Mar 2013
Vehicle: 1989 300 TE 280,000♪ previously♪ 1978 450 SEL 6.9♪1980 500 SE (Super Steel)♪
Location: Suncoast, Florida
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
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. . .
Docatari is offline  
#4 (permalink) Old 03-22-2013, 11:04 AM
BenzWorld Elite
 
sbaert's Avatar
 
Date registered: Jun 2007
Vehicle: '94 E320 T, '95 E320 T,'95 E300 DIESEL, '95 E250 DIESEL
Location: San Diego
Posts: 9,708
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
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).
sbaert is offline  
#5 (permalink) Old 03-22-2013, 04:29 PM
BenzWorld Junior Member
 
Date registered: Mar 2013
Vehicle: 1989 300 TE 280,000♪ previously♪ 1978 450 SEL 6.9♪1980 500 SE (Super Steel)♪
Location: Suncoast, Florida
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
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)
Docatari is offline  
#6 (permalink) Old 03-22-2013, 04:33 PM
BenzWorld Elite
 
lowesguy's Avatar
 
Date registered: Feb 2011
Vehicle: 91 500SL ,90 300SE, 91 300E sold , 92 300E ,02 Kia Sedona starship cruiser
Location: Temecula Ca
Posts: 5,595
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
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

John

Last edited by lowesguy; 03-22-2013 at 04:37 PM.
lowesguy is offline  
#7 (permalink) Old 03-22-2013, 05:02 PM
BenzWorld Junior Member
 
Date registered: Mar 2013
Vehicle: 1989 300 TE 280,000♪ previously♪ 1978 450 SEL 6.9♪1980 500 SE (Super Steel)♪
Location: Suncoast, Florida
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
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.
Docatari is offline  
#8 (permalink) Old 03-22-2013, 09:26 PM
Lifetime Premium Member
 
augapfel's Avatar
 
Date registered: Jan 2006
Vehicle: About a dozen 1988, 1989, 1990, and 1991 sedans, wagons, and 4Matics; drivers, projects, and parts
Location: Just west of Philly
Posts: 5,281
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Lifetime Premium Member
You changed the green top one at the back of the head? That's the coolant temp sensor used for the injection system.
augapfel is offline  
#9 (permalink) Old 03-22-2013, 11:03 PM
BenzWorld Elite
 
sbaert's Avatar
 
Date registered: Jun 2007
Vehicle: '94 E320 T, '95 E320 T,'95 E300 DIESEL, '95 E250 DIESEL
Location: San Diego
Posts: 9,708
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
EHA = Electro Hydraulic Actuator (MB terminology)

EVA = Extra Vehicular Activity (NASA terminology)
sbaert is offline  
#10 (permalink) Old 03-23-2013, 06:40 AM
BenzWorld Junior Member
 
Date registered: Mar 2013
Vehicle: 1989 300 TE 280,000♪ previously♪ 1978 450 SEL 6.9♪1980 500 SE (Super Steel)♪
Location: Suncoast, Florida
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
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.
Docatari is offline  
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W124 E,CE,D,TD Class


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome