Thank you all,

<<"When looking at this properly a lean compensation for a rich mixture has the duty cycle oscillating lower than 50% say 35 -40%">>

So my control system is compensating for a rich mixture. Does this mean something is not working properly. It stays at 36%, hardly any fluctuating at idle.

When I turn the lambda adjusting device screw CW the duty cycle on my digital meter goes down. When I turn the screw CCW the displayed duty cycle goes up. When i raise the duty cycle above 36% the engine stalls. This part does not confuse me. What does is that I'm told to target around 50% but the engine stalls if i try to adjust higher than 36% (by turning screw a little more CCW). Any suggestions?

With KOEO, duty cycle is 0% and the voltage on term 3 is battery +.

Exhaust smells fine.

Does the fact that I can't adjust the base setting higher than 36% at idle indicate a problem that should be explored? If I can't adjust higher than 36% what should i adjust it too?

Raymr, what does 30/70 mean? Are those target duty cycles or something?

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1972 450SL
1982 300D Turbo