Greetings Dave- hope this issue gets resolved!

fwiw- I recall from a Hot Rod Forum post ~24 mos ago:
... of an E500 owner whom indicated that he was getting rid of his 124.036 and observed power/tq decrease over the life of his deemed healthy '94 E500.

I believe he also shared that he's owned 3 different 124.036's and was moving toward a 400HP Jag type R as his incoming replacement.

Have you had a detailed chat yet with Carl at Bergwerks, Donnie from MB Autowerks, M.B. Doc, Bruce Strauss in S Cal, Steve Brotherton of Continental Imports, or any techs here on this board regarding testing procedures and proper operation of the cam advance for your ''94?

-fad