What is this for?

[Brian Devlin]

>Hello,
>
>I got my hands on a Bently for my Audi 4000S.  Nice
>book, so so so much more helpful then the Haynes
>version.  I recommend it to everyone except for its
>price.  LOL

Being better than haynes isn't saying much. Maybe I should write a
book myself...

>Anyways, I was doing the CONTROL UNITC continuity
>check as per say in the book.  Well, I've found out
>that my throttle switch doesn't work.
>Continuity test results:
>Open when no throttle -> good.
>Open with throttle ->bad, supposed to be short.
>
>What does the throttle switch do?  I haven't replaced
>it yet.  But, my car seems to work great without it.
>So that is why I am writing this message, what's it
>for?

I assume you're refering to the wide-open-throttle switch (AKA "WOT
switch"). It causes the mixture to go rich when you floor it, for a
bit more power.

>Similarly, what is the purpose of the idle switch?

Turns on the idle stabilizer and also tells the ECU it can shut off
the fuel if RPMs are above 2000 (better engine braking and saves a
bit of gas).

>
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