Pedro,
Here are a couple of good links. Adjust the valves first. Make sure
the fuel filters are new. Clean the tank strainer if you suspect it may
be clogged (like it runs poorly with less than ¼ tank in it).
http://www.serenitysys.com/MB/Service_Info/Turbo_Tweak/tweaking_the_merc
edes_617_turbo_.htm
http://business.baylor.edu/Richard_Easley/autofaqs/wgate.htm
And if you really want to get into trouble have a look at this last
link.
http://brandon.importtransmissionexchange.com/benz_files/ip_adjustment.h
tm
There is more than a weekends fun here. Also, do you have the EGR
valve blocked off?
Have fun!
David J. Carter
With 4 W123 diesels, two with Garrett and one with a KKK turbo.
