Throttle switch

[Jens Knickmeyer]

Hi all!

In my Polo-G40, I found the idle throttle switch to open
_before_ the throttle plate moved. When I had a friend of
mine pressing down the accellerator pedal, I heared the
click of the switch and shortly after that, the throttle
started to open. I always thought it should be the other way
round: the throttle opens a bit and then the switch opens
its contacts?

The reason for my question is a problem during warm-up.
The engine starts perfectly, runs good during post-start
enrichment, but then suddenly acts a bit reluctantly.
When I press down the accellerator pedal only a little
bit, the engine revs 100rpm below its normal idle rpm.
Accelleration from idle rpms lets the engine tend to stall.
These effects vanish when the engine is warmed up.

I wonder if the idle switch is adjusted correctly. The
VW service men said yes, but it would not be the first
time they are wrong, so I thought I'd better ask the 
list members...

Any help is apprciated, thanks in advance.

Jens ('92 VW Polo-G40)

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           Jens Knickmeyer
Technische Universitaet Braunschweig
         Mikroprozessorlabor
 38106 Braunschweig near Wolfsburg
       knick at ibr.cs.tu-bs.de
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