Quote:
Originally Posted by W109Driver
To previous point.
I've squeezed rubber hose next to AAV and the revs drop down. So this makes me think it is definitely AAV fault.
Have not ever put it on a COmeter, but how would you be able to adjust the mixture, lean it off if needed?
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You can try soaking the AAV in both solvent and detergent. Then use a heat gun and cold water and try and cycle the valve from hot to cold and back several times. It should close completely at about 150F.
However, the piston does get rough from grit entering with the air. It is possible to dismantle the AAV and then clean and polish the working parts properly.
Covered in this thread (read whole thing 
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If you can find a reliable CO meter (or a wideband air-fuel ratio meter) then you can adjust mixture. There are two adjustments. Main adjustment is a small screw on the Manifold Pressure Sensor. Very sensitive and should not be done unless someone has been there before and removed the seal on the screw. There is a knob on the ECU that only adjusts idle mixture. You can mess with that to your hearts content
Set in middle of range and move to each side of that to achieve best idle.
Other thing that affects mixture, is fuel pressure. Higher than 2bar standard pressure, richer mixture. Lower pressure, likely hot start problems.
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Graham
85 300D
,72 350SL, 98 E320, Outback 2.5