Now that Nathan posted a PET pic, I'm quite sure my hose going from "disc" was blanked off with a small screw as my air-injection system was removed all together.
With that in mind, I would try to just block the hose going from a banjo alltogheter and concentrate on leaky parts. I bet all your CO and idle speed issues will go away once you fix the leaks and re-adjust the CO screw. Your turbo will have much easier life as well.
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Thank you for your time,
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