The 1980 model was the first with lambda control. Be sure the frequency valve is buzzing. If not check the overvoltage protection relay (or whatever they called the power relay in a 116 chassis).

Without the drop in lower chamber pressure the car has no power even though it runs smoothly.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician