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Inside in the AFM there is a spring actuated arm. It is adustable by position. I think I remember and I may be incorrect here, but counter clockwise is leaner. Clockwise is richer. My 951 came from a state without emissions testing, and it was way out of spec. I needed to move my AFM three clicks lean to get it to pass. This adjustment is directly proportional to the DME air/fuel mixture control. The screw that is covered by the plate on the AFM is a fine mix adjust screw. It can get you .5 .1 adjustment. But for major adjustment the cover must be removed and dialed in. I put my 951 on a three gas anylyzer that I have and adjusted from there. Some members on this list can do it just by smell! I am not that good.
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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