Quote:
Originally Posted by Jeremy5848
I agree, at least as regards the OM603 engine in the W124 chassis (my car). The 300SDL should be the same. There is a base idle speed (about 500 RPM) set by a screw in the IP and the ELR holds the idle a bit above that (about 650 RPM).
This is sounding like there could be more than one cause. If there was something wrong with the mechanical idle and then ELR failed . . . this is something you can test for, as the hypothetical mechanical idle failure should be there all the time. To test: With the engine warmed up and idling normally, remove the 2-pin plug from the ELR controller at the rear of the IP. The idle should slow to about 500 RPM. If the engine immediately dies then the mechanical idle is not working.
Jeremy
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A question about this test: I was assuming that the ELR lost power with the rest of the car when the ignition switch goes off. Although the tachometer goes off too, when I was shutting the ignition off with the shutoff disconnected and then getting out to kill the engine, it was DEFINITELY idling at what sounded like about 500 - very reliably. I'll pull the plug to check but I'm pretty sure the ELR was shutting itself down anyway with the key.