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Originally Posted by raymr
The O2 sensor is new. I haven't done anything with the ECU since my dad had it replaced several years ago. The car passed emissions a few months ago and mileage is decent, so the equipment is mostly working.
I just checked the braingears manual. For my year car there is no specific on/off ratio, but the ratio at idle should be close to what it is at 2500 rpm. I guess I'll check that next.
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50% is what mercedes calls for in the manuals, i adjust to the rich side for better idle quality and to compensate for engine wear and possible vacuum leaks. seeting it where i do does not have negative impact on emissions. so try 50% and see what happens, be sure to rev the engine to get the oil hot, on the side of the engine near the oil filter housing there is an oil temp sensor that only enables lambda when the oil is good and hot.