Ya, I guess I should clarify... my SDL does use the ELR to keep the idle speed constant (and it changes the idle speed based on temp too), but there is no adjustable knob like the early 603's.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000).

Tesla Model 3. 136,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.