I did put a meter on pins 2-3 and all i get is a constant 13.5 volts - so that either is battery voltage or lambda controller is shot.
Again my car is 1984 380SL and don't have the diagnostic manual.
Unfortunately the adjustment screw on my fuel distributor is sealed so not sure I am going to have the nerve to cut open the adjusting tower to get to the adjusting screw.
I am going to try a new O ring in the used WUR that I will rebuild.
Buying a new O2 sensor and also a new OVP relay - hopefully that may get some results.
Running out of other options other than a rebuilt lambda controller??