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Erratic temperature gauge

In message <E0xiIg3-0005nu-00@iglou.com> "Douglas Hurst Quebbeman" writes:

> > 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.
> When the engine is running, the alternator should be supplying the 
> electrical needs of the car, including the idle system. So why is it
> that battery voltage would play a role?

I didn't design the system - you'll have to ask Audi.  Perhaps Bosch told them 
that 800 rpm (times the pulley diameter ratio) isn't enough for the alternator 
to generate its full output?

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