[W126 Coupe] EHA replacement

[Jonathan]

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


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1996 S600 Euro "Scharnhorst"
1991 560 SEC Full Euro ECE
1991 560 SEC 226Hp/271ft/lbs
1989 560 SEC AMG (N.A. Conversion 250/297)
1987 560 SEC 
1986 560 SEL 6.0L 32V AMG
1985 300 CD (for sale)
1980 280 SE Euro
1986 560 SEC (parts)