Re: Boost gauge problems

["Fred Munro" <munrof@isys.ca>]

What does the gauge read with the engine off? Is it right on 0 or offset to
the vacuum side? If it is not on 0, you will have to re-zero the gauge.

Fred Munro
'94 S4  91k km

----- Original Message -----
From: TM <mizutanit@mindspring.com>
To: Quattro List <quattro@audifans.com>
Sent: Saturday, October 30, 1999 4:19 PM
Subject: Boost gauge problems


> Hi listers,
> I have a VDO boost gauge in my A4 1.8T. I recently removed the gauge to
> paint the gauge housing, unhooking the two electrical wires and unscrewing
> the vacuum line. Ever since doing that, I get a much lower reading.
>
> Is there a "recalibration" or some sort of reset necessary when
reinstalling
> the gauge? I checked for leaks, and I don't seem to find any leaks. The
> line has a threaded coupling that is sealed with Teflon tape.
>
> For whatever reason, I think the gauge is reading about 5 psi low- I get
> about 22 vacuum at idle when I used to read about 20, and max boost now
> only goes to 15 when it used to overboost to about 20 psi.
>
> Any help diagnosing/fixing this problem is greatly appreciated.
>
> Thanks,
> Taka Mizutani
> 99.5 A4 Avant 1.8TQMS
>
>