[W126 Coupe] EHA replacement

[Jonathan]

The EHA is the small black box screwed to the side of your fuel distributor.

It controls the differntial pressure b/w the upper and lower chambers in 
your fuel distributor.  The difference in pressure corresponds directly 
to how much fuel will be sent to your injectors.

It receives it's signal from the KE control unit in Milivolts, said 
signal being a figured on signals like temp, O2, RPM etc..

Jonathan

Hovsep Dovlatian wrote:

> Im sorry im stupid whats an EHA?

>

> */Jonathan <jhodgman at gmail.com>/* wrote:

>

>     Richard Hesek wrote:

>     > Hello,

>     > Last week I was faced with the replacement of my EHA unit in my

>     87 560

>     > SEC.

>     >

>     > The initial symptom was leaking fuel but after replacing the

>     device I

>     > realized I had been living with a poor performance.

>     > Nice smooth run now.

>     >

>     > Before replacing the EHA, however, I searched the archives for any

>     > additional info that might help.

>     > One post, from last year, indicated an adjustment within the EHA to

>     > increase fuel pressure for older (100k miles +) engines.

>     >

>     > Does anybody here have experiance with this adjustment?

>     >

>     > Thanks,

>     >

>     > Rick Hesek

>     >

>     >

>     > The MB Coupes Website!

>     > W126 SEC Mailing List

>     > Postings remain property of MB Coupes, L.L.C.

>     >

>     >

>     Yes, I typically find you can fatten up the EHA just a hair for

>     better

>     peak torque/HP...the cars usually come a touch lean from the factory.

>

>     Ideally you want to be able to tune w/ a wideband O2 so you know

>     you're

>     not going too far.. However, that aside you can usually pull the

>     screw

>     off the back of the EHA and give the 2.5mm hex a 1 flat turn to

>     the right.

>

>     Jonathan

>

>

>     -- 

>     Blue Ridge Mercedes

>     Offering Enthusiast Service, Restoration and Modification.

>     Providing quality parts to discriminating customers in all parts

>     of the world.

>     Located in the Greater Atlanta area.

>     http://www.blueridgemb.com

>

>



-- 
Blue Ridge Mercedes
Offering Enthusiast Service, Restoration and Modification.
Providing quality parts to discriminating customers in all parts of the world.
Located in the Greater Atlanta area.
http://www.blueridgemb.com

1996 S600 Euro "Scharnhorst"
1991 560 SEC Full Euro ECE
1991 560 SEC 226Hp/271ft/lbs TT/MS II conversion in progress
1989 560 SEC AMG Undergoing Mech. lifter/radical cam conversion
1986 560 SEL 6.0L 32V AMG
1980 280 SE Euro
06 Z4 3.0Si 6sp, Porsche Cayman S conversion in progress

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