Mike I used this site for mine it really is very good. http://www.landiss.com/mixture.htm, There is also a very good article from Steve Brotherton about the injection systems http://www.peachparts.com/Wikka/EngineControls
http://www.slack.net/~thundt/mercedes/high_idle_hell.htm

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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)