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The AAV is easy to test. Remove it from the car and put it in the freezer. After 15 minutes or so the slide valve should be open. At room temp it should slowly close back up as it warms.
The AAV increases the idle during cold starts. It will never decrease the idle to less than the set speed. If you completely remove the unit and block off the hoses the car will still start and run due to the rich mixture of the WUR.
Try both of these methods and see what you find.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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