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Originally Posted by mctwin2kman
I did this because I have a rough idle and EHA is the last thing to check.
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Well if what the EHA is doing means anything to one, it is the first thing to check. It establishes closed loop control and basic mixture setting.
An EHA current of zero means it is DEAD, doing nothing, zippo, kaput. Removing the OVP assures that it is dead, zippo, kaput. And when you pull the wire from the dead, zippo, kaput EHA, it will still be dead, zippo kaput.
MB designed the system such that a properly adjusted warm car will limp home just fine with the electronic control dead, zippo, kaput.