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Re: Boost gauge problems

A word of caution here.  The manifold pressure of the engine while not
running will be some fairly close approximation of 1 atmosphere or 1 bar
(it depends on the barometric pressure at that particular time and
location).  Whether the gauge might need re-zeroing or re-oneing [:-)]
depends on the actual gauge and whether it reads in bar (absolute) or psig
or whatever.

At 07:56 PM 10/30/1999 -0400, Fred Munro wrote:
>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
>> 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
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