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Erratic temperature gauge
In message <E0xiIg3email@example.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?
Committee Member, UK Audi [ur-]quattro Owners Club