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Erratic temperature gauge

In message <> Jeff Witwer writes:

> Infrequently it still idles higher than it should (1100rpm), ...

There are several reasons why the idle controller will deliberately raise idle 
from 800 to 1100 or so.  Chief among them is low battery voltage - on some 
cars, vehicle motion is another.

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