THANKS GUYS, for this interesting threadid.
I have a similar problem in my 190E, 2.6L, 1989.
I can't get perfect idle.
At morning is hard to start. We don't note the operation of the cold start valve. We messure zero volts in the socket going to the CSV.
We clean the idle valve, test and it works, but It don't increase the RPM when is cold or when the AC start. It does'nt compensate the RPM when the AC start.
The voltage of the line disconected going to the idle valve is the same that the battery (12.70 volts), but when it is connected to the idle valve we read only 1 volts.
Please, From where is coming the additional energy to active the idle valve?
Please, Can anybody to explain the wire operation diagram for the idle valve and cold start valve ?
The car lost 200 RPM when AC start, and 300 RPM when shift from P to Drive.
All the injectors and plug are new. I will try to get vacuum linkage with soapi solution.
Once changed the O2 sensor we get MAS calibration for 50%, using the allen 3 mm and messuring betwen pins 2 and 3 in the test socket.