This morning, from cold... well 70 deg here in the OC, it did start, but ran very roughly.
So, I will connect the meter as you say, and see what it says.... then I will turn it to push it back to at least 85%, to start with.... but is 85% rich or lean relative to where it should be at 50%?
So if its reading say 95%... to bring it back to 85% do I go richer or leaner?
If that makes sense?

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2009 Mercedes ML320 Bluetec