EHA Valve original/factory adjustment(setting) - Mercedes-Benz Forum

Go Back   Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W126 S,SE,SEC,SEL,SD,SDL Class
New User? Register - Forgot Password

BenzWorld.org is the premier Mercedes-Benz Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 08-30-2012, 09:20 AM   #1 (permalink)
BenzWorld Junior Member
 
Raptor@'s Avatar
 
Date registered: Jun 2009
Vehicle: Mercedes-Benz w126 280s euro; 500sel euro
Location: Sofia City ,Bulgaria
Posts: 43
Send a message via Skype™ to Raptor@
Exclamation EHA Valve original/factory adjustment(setting)

Hi Guys !

Just spoke with my car's prev. owner about my fuel consumption and performance issue and he said that 2 years ago somebody maybe fake mechanic or idk ... tries to "fine tune" the CIS from this EHA valve!!!(i read some topics after this that is strongly not recomended action to do) So it seems that i've never know what is good adjusted CIS system So my question is does somebody knows the original(default/oem factory) adjustment/setting of the screw at the EHA valve body? So that should be the first point to start from...i searched the forum and found less about the original setting only for the "magic 1/4 turn" and someone says that the OEM adjustment is 6 and 1/5 or 5 and 3/4 turns but for me that seems impossible because mine now is 3 and 1/4 turns CCW from bottom .
The car is 86's 500sel M117.965 ECE

Thx in advance
__________________
AS I S8 V8 IS GR8

Last edited by Raptor@; 08-30-2012 at 10:06 AM.
Raptor@ is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-30-2012, 09:49 AM   #2 (permalink)
Premium Member
 
Date registered: Mar 2010
Vehicle: 560SEC, 190E, Frontier, 240Z
Location: Phoenix
Posts: 1,291
Premium Member
The settings on the EHA valve have to be fine-tuned for each car and Distributor.
It sets the difference in fuel pressure between upper and lower chambers.
As a rough, you could use fuel pressure gauges and get the pressure difference referenced in the manual.

Or, you can reference the Duty Cycle and see what the DC does at 2500rpm compared to idle. The DC needs to be very similar at 2500rpm vs idle and then your EHA is about right.

Remember to burp the FD each time you open the system and drive it some to normalize the changes in between.
__________________
Tom Johnson, Phoenix, Az
1988 560SEC
1993 190E-2.6
1973 240Z (Track only)
1970 240Z (Shell)
2006 Frontier DD
tjyak50 is offline   Reply With Quote
Old 08-30-2012, 10:12 AM   #3 (permalink)
BenzWorld Junior Member
 
Raptor@'s Avatar
 
Date registered: Jun 2009
Vehicle: Mercedes-Benz w126 280s euro; 500sel euro
Location: Sofia City ,Bulgaria
Posts: 43
Send a message via Skype™ to Raptor@
Quote:
Originally Posted by tjyak50 View Post
The settings on the EHA valve have to be fine-tuned for each car and Distributor.
It sets the difference in fuel pressure between upper and lower chambers.
As a rough, you could use fuel pressure gauges and get the pressure difference referenced in the manual.

Or, you can reference the Duty Cycle and see what the DC does at 2500rpm compared to idle. The DC needs to be very similar at 2500rpm vs idle and then your EHA is about right.

Remember to burp the FD each time you open the system and drive it some to normalize the changes in between.
Yep...i mean instead to purchase new EHA with the default setting to adjust this one by myself...
so...
-i know that the delta-P btw upper and lower should be 0.4bar??(didn't check it yet)
-about Duty cylce on idle ~600rpm is 6.83V and ~2.500rpm is 6.85V ( new...spark plugs ,cables,overhauled FD,fuel accu,pumps,fuel return,vlv,filterS,relays)
Raptor@ is offline   Reply With Quote
Old 08-31-2012, 12:37 AM   #4 (permalink)
BenzWorld Extremist
 
Dr. Sternschnuppe's Avatar
 
Date registered: Dec 2011
Vehicle: 600 (3.200 mm)
Location: CH
Posts: 869
Quote:
Originally Posted by Raptor@ View Post
-i know that the delta-P btw upper and lower should be 0.4bar??(didn't check it yet)
Yes, ΔP should be 0.4 bar.
__________________
Mercedes-Benz. Ihr guter Stern auf allen Strassen.

Last edited by Dr. Sternschnuppe; 08-31-2012 at 01:20 AM.
Dr. Sternschnuppe is offline   Reply With Quote
Old 08-31-2012, 12:55 AM   #5 (permalink)
BenzWorld Extremist
 
Dr. Sternschnuppe's Avatar
 
Date registered: Dec 2011
Vehicle: 600 (3.200 mm)
Location: CH
Posts: 869
Quote:
Originally Posted by Raptor@ View Post
So that should be the first point to start from...i searched the forum and found less about the original setting

N.B. Adjustment of the KE-Jetronic, and in particular EHA - is very difficult process. Which demands the attentiveness and the presence of the certain knowledges.

Original setting (on new EHA):
depth from EHA body to adjusting screw is 6.6 mm

Current at actuator (only ECE/RÜF):
ignition "ON" = + 70 mA
idle, coolant temp. +20 C = 2.6 mA
idle, coolant temp. +80 C = 3-4 mA
post-start enrichment, +20 C coolant temp. = 7-13 mA
acceleration enrichment at +20 C and blipping throttle = >20 mA
full load enrichment at approx 5000 rpm = 4-6 mA
part load mixture adaptation = from -9 to 0 mA
decel fuel cutoff = approx -60 mA


Salut!

Last edited by Dr. Sternschnuppe; 09-04-2012 at 05:15 AM.
Dr. Sternschnuppe is offline   Reply With Quote
Old 09-01-2012, 11:30 PM   #6 (permalink)
BenzWorld Junior Member
 
Raptor@'s Avatar
 
Date registered: Jun 2009
Vehicle: Mercedes-Benz w126 280s euro; 500sel euro
Location: Sofia City ,Bulgaria
Posts: 43
Send a message via Skype™ to Raptor@
Dr. Sternschnuppe Thank You ,but i can't figure out this 6.6mm are axial from the body to the groove of the screw or ?
Raptor@ is offline   Reply With Quote
Old 09-03-2012, 09:30 AM   #7 (permalink)
BenzWorld Extremist
 
Dr. Sternschnuppe's Avatar
 
Date registered: Dec 2011
Vehicle: 600 (3.200 mm)
Location: CH
Posts: 869
Attached Images
 
Dr. Sternschnuppe is offline   Reply With Quote
Old 09-03-2012, 10:26 AM   #8 (permalink)
BenzWorld Junior Member
 
Raptor@'s Avatar
 
Date registered: Jun 2009
Vehicle: Mercedes-Benz w126 280s euro; 500sel euro
Location: Sofia City ,Bulgaria
Posts: 43
Send a message via Skype™ to Raptor@
Thx Alot :P and Cheers from Bulgaria!!!
Raptor@ is offline   Reply With Quote
Old 09-03-2012, 04:02 PM   #9 (permalink)
Premium Member
 
trooper6's Avatar
 
Date registered: May 2009
Vehicle: 1989 560SEC
Location: Ladera Ranch, CA
Posts: 1,728
Premium Member
Quote:
Originally Posted by Dr. Sternschnuppe View Post
Excellent graphic and info!


Sent from my iPhone using Autoguide
__________________
1989 560SEC (US spec) 040 Black/Black, 17" Aero I's, H&R springs, Bilstein HD shocks, Euro Headlights,Tri Y's, First Gear Start Module, AMG (clone) Heads Solid Lifter Conversion and AMG Gen II US Body Kit
2014 ML350 (Wife's Car)
trooper6 is offline   Reply With Quote
Old 09-04-2012, 04:59 AM   #10 (permalink)
BenzWorld Extremist
 
Dr. Sternschnuppe's Avatar
 
Date registered: Dec 2011
Vehicle: 600 (3.200 mm)
Location: CH
Posts: 869
But we should remember necessarily, that adjustment of work of the KE-Jetronic must be carried out only as adjusting of a whole system, including each component.
Therefore as, each separately taken component defines work of all system.

Salutte!
Dr. Sternschnuppe is offline   Reply With Quote
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W126 S,SE,SEC,SEL,SD,SDL Class

Bookmarks



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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



All times are GMT -7. The time now is 08:44 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.1

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.