Quote:
Originally Posted by Graham
I read somewhere that it was idle speed, but can't find the link. Perhaps only on 85 W123 and W124's? Perhaps it is used to calibrate the tach? Couldn't find anything in 123 manual.
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I read idle speed as well, however there is nothing that connects to the IP that would do the job. You've got 3 sensors - rack position, coolant temp, and RPM; and controllers - switchover valve and vacuum converter. Since the only thing you could trim would be the two controllers, that's obviously what's going on. And since you have nothing to control (its been removed) you can ignore the trimming plug.