Quote:
Originally Posted by joan1094
The gas analyser is a good idea, thanks, but i would like to know if can be done more precisely.
I am pretty sure the car was produced without the sensor, i've checked others W201 and w124 and mostly dont have pin 3.
Frank, what is the other way to calibrate it?
Thanks!
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The pic of the FD/airmeter is quite interesting; the package is for KE-Jetronic (aka, CIS-E). On the side of the FD is an EHA (the black plastic rectangle), which is the device that varies the mixture in response to changes in the oxygen content of the exhaust stream. The EHA receives a signal from the engine control unit (ECU), and the primary input to the ECU is the signal from the O2 sensor.
When an O2 sensor is present, and the engine is started from cold, the KE-jet system operates with a fixed current to the EHA (Open-loop mode) until the O2 sensor comes up to operating temperature and is sending a reliable signal.
If there really is no O2 sensor installed, then the system has been configured to operate permanently in Open-loop.
With all respect, after seeing the pic of the FD, there is a question in my mind about past work on the system: the injection pipes have been treated quite roughly; the bends are not as they were from the factory.
If you can access the ECU, look for a connection at pin #23; that is the source of the signal that would be seen at pin3/x11.