My 240D is scoot'n like it's supposed to now, thanks to Steve. That rod and spring did the trick. I was wondering how the modulator works, and now I do. MB should include that rod and spring with every modulator. The info about the throttle valve linkage, I haven't seen that anywhere else; so I think that's a first. But one thing I noticed was when I turn the key clockwise, I get a harsher shift; and when I turn it counter-clockwise, I get a smoother shift. This is different from what I've read elsewhere. But, again, thanks Steve for sharing your great knowledge.

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'80 240D (sold) wish I didn't.
'85 300D (240K miles)