Date registered: Apr 2009
Vehicle: Current: 1987 560 SEC US, former factory trained MB tech 10 years, owner of 14 others.
Location: Spokane, WA.
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Well it is adjusted two ways, first the idle speed then the CO readings. I would get a vacuum gauge and adjust the mixture to the highest reading, then adjust the idle. That is the simple way. They typical idle speed IIRC is about 650 rpm in drive. BTW, you need to do these adjustments in drive, so make sure your emergency brake works and you have something to chock the wheels.