1990 10vt avant - falls on its face at 4k rpm

[Paul Caouette]

Folks,

We're heading out to sea....literally...and liquidating a whole bunch of
stuff.

I'll be post on the Audifans later this week.

Professionally Rebuilt 20v NA head

Rear light panel for 1983 urq coupe

Misc injectors for 5000 series turbos

Instrument panel from 1989 Audi 5000 Avant

1990 90 20 valve in pearl ....Colorado car.... 212,000 miles

Still later I'll be parting with Veronica....a 1991 20v Turbo Avant in
pearl........with a left rear quarter panel that is completely gone...she
was mugged by a bus. ....


We're really doing it......sailing away for as long as the money lasts......


On Sun, Feb 22, 2009 at 9:45 AM, Bares, Vittorio
<Vittorio.Bares at nuance.com>wrote:

> Thanks, and also to the listers that responded off list.
>
>
>
> I checked the WG solenoid hose - it was indeed occluded - which would
> explain the over boost. The old rubber hose had collapsed on its self
> and was blocking the passage of most of the air.
>
>
>
> That is now taken care of :-) Gauge shows 1.9, and never gets to fuel
> cut.
>
>
>
> However, the 4k rpm problem persists.
>
>
>
> I looked for boost leaks, basically looking for oil as I would imagine
> that oil vapors would accumulate and exit in any spot where there is a
> leak. Nothing of any significance.
>
>
>
> Then I thought, ok, what if the recirc valve is toast? I have one of the
> plastic ones (bosch I believe), plumbed into the IC just below the exit
> tube to the TB.
>
> *       I believe boost is measured there, at the exit of the IC
>
> *       I'm theorizing that if the recirc is always open, that boost
> would actually still be ok, since the recirc dumps into the hose that
> goes to the turbo inlet (not sure about this though).
>
> *       What I did as a test is pull the hose that is used to dump
> pressure, blocked the hose its self and the inlet on the pipe that goes
> to the turbo. Started the car, then unblocked the hose going to the
> recirc valve - motor died.
>
>
>
> If my understanding of how the recirc valve works, it should be sealed
> at idle and only open up to dump pressure when you come off the throttle
> (activated by a vacuum line that goes from the IM to the recirc valve).
>
>
>
> Do I have this all sideways? Or does this make sense?
>
>
>
> Vittorio -
>
>
>
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-- 
Paul Caouette