Date registered: May 2007
Vehicle: 2003 Mercedes Benz E500
Location: San Francisco Bay Area
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
I am not sure on those issues...
I would think that a governor issue could cause a loss in performance; that makes sense; however, I am not a bona-fide "diesel dood". My familiarity with mechanical injection primarily comes from the gasoline engine side of things, and those systems are much more forgiving of timing issues, etc.
I would suggest a post in the W123 forum, as there are still a great number of diesels in that chassis floating around, and someone more qualified than I am may be able to give you a hand...