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Loosen that little nut on the stud sticking out in your top pic and turn the stud slightly (slotted end?), I can't recall which way but one direction will make it open. Careful re tightening the jam nut or you'll need a new AAR for sure.Is the plastic thing on the end where the plug goes in loose?, if it turns the unit is toast.
Here is one from my spare 2.0 motor taken at 23deg C. an hour ago. Never messed with, adjusted - nothing. Did you check the resistance at the plug as per the Bentley. Should be 30 ohms. Mine is 30.9. Best one ever. Most I have had (probably 10 or so) are in the 40's or 50's. This engine starts right up idles fast and slows down to 900 or so. Higher fast idle in the cold. Just as it should.Maybe you should try one from a FI Rabbit/ early Golf or Jetta. The don't stay open as long but the initial air flow is similar. I have looked at them all. They all fail or work poorly at some point and the rebuilds are junk.