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CIS mixture adjustment access hole?

In message <01BD3D04.1A08F4C0@gpowell.acacianet.com> glen powell writes:

> This adj access hole is empty on my ur-q.

> Should there be a plug in this hole?

035 133 465A
> Will a missing plug here result in a vacuum leak?

Yes.  Neither you or the car will notice.

> There is no observable problem that I am aware of,  just curious.

You can suck dust in.  Theoretically.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club