Idle Problems

[Brett Dikeman]

At 12:08 AM +0200 6/16/02, Endr‘di Gábor wrote:
>Hi Audi Fans!
>I've a problems with my 20VQ
>Symptoms:
>After some really hard accelerations the idle speed falls down to 200
>rpm, -sometimes the engine stops- and after it the idle speed starts
>to raise up to 900.

The stalling is a dead giveaway for a toasted turbo bypass valve.

I would check both the control line(which runs from the valve at the
front of the car right in front of the turbo to the back of the
intake manifold) and the valve(remove from car, apply moderate
vacuum, make sure the valve holds the vacuum.)

I believe that control line failure does not cause the stalling, only
a leaking valve does...but I'm not sure.  In any case, the line is
probably shot too; it usually only lasts a few years tops because of
the heat from the exhaust..more specifically, it seems to fail right
around the wastegate area.

Brett
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