Fwd: Acceleration problem? (For Damien Gaboury or anyone who knew that)

[Audi Fans]

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Note: forwarded message attached.


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Date: Tue, 6 Aug 2002 17:22:43 -0700 (PDT)
From: Audi Fans <oooo_90q at yahoo.com>
Subject: Acceleration problem?
To: damien_gaboury at 40uqac.uquebec.ca
Cc: oooo_90q at yahoo.com

Hi Damien,

I read the your email listed below from audifan.com.
Since I have a similar acceleration problem as you
described, would you tell what is the temperature
sensor that you mentioned? What's its location? Is it
related to O2 sensor?

Best Regards,
Steven
'93 90CSQ / 120K miles

Hi V6-12v owners

I hope that this time it is true.
I solved my one year problem of engine acceleration
while running at =
normal temperature. The problem (see my numerous posts
since one year) =
was hesitation during acceleration at full or part
throttle but only =
when the temperature of the engine was above 90 C
(100C  normal engine =
temperature). So during the winter there is no
problem.

That is the mystery of 150 ohms. I have changed my
temperature sensor. =
In fact, the problem was that resistance specification
was out at high =
temperature. As measured, old one was at 350 ohms at
100 C (measured as =
heated in boiling water) while the new one is at < 200
ohms. =
Specification from the Bentley is 330 ohm at 80 C. So,
you can imagine =
that the ECM had to deal with false measurements from
the temperature =
sensor. Since that device is the most important for
controlling air-fuel =
mixture and ignition timing, the engine ran rich at
the normal =
temperature. I interpret that the hesitation was
related to the action =
of the Ox sensors trying to change the rich-mixture
during acceleration. =
So it cost 46 $ Can to solve that problem.

For those interested to test their sensor, you need a
long 19 mm socket =
to remove it. It is quite easy. Waite for engine
cooling before removing =
it and expect some fluid escape from the hole (not too
much). You can =
test it by measuring in-situ resistance. Start the
engine, disconnects =
the wire (check engine light will be on), and measure
the resistance at =
normal engine temperature. Resistance should be close
to 200 ohms.

 A happy Audi driver

_____________________________________________________

Damien Gaboury, PhD
Scientifique de recherche
Consortium de Recherche en Exploration Min=E9rale
(CONSOREM)
Universit=E9 du Qu=E9bec =E0 Chicoutimi




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