I've turned the 1-7 dial behind the fuse box up all the way to 7 to test it and had the same problem. Right now it's set to 4 where the service manual recommends - and if the tachometer can be believed, it's holding the factory rpm recommendation.

Thanks...

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL