[V6-12v] Almost stall at start

[Lino M. Valadas]

Hi,

My wife's 93 90cs has for a long time experience the following at start up
time:  The engine starts always very well with no gas, revs up and then
within a few seconds the revs come to almost stalling.  At that point some
other mechanism kicks in and bring the engine back up to normal idling
speed.  The engine never really stalls.  Once it does this hiccup, it never
does it again until the next cold start.  I have cleaned the ISV to no
avail.  Has anybody experience this?  Is there a sensor sending the ECU the
wrong input? Any suggestions would be welcome.

TIA
Lino


----- Original Message ----- 
From: "Rob" <beattyr2003 at cox.net>
To: <V6-12v at audifans.com>
Sent: Saturday, January 28, 2006 7:11 PM
Subject: [V6-12v] New A6 with some minor issues and some questions


> So I made the leap from 200 tq to the A6Q.  I love the car, but certainly
> miss the acceleration of the 200.  Have some minor things to work out
> though.
>
>
>
> Car is a 1995 A6 Quattro sedan with manual transmission.  The AC head fan
> speed display light is blown out.  I also am not getting airflow through
the
> footwell vents.  I haven't run the diagnostics yet, have to read through
> them, and its from an online tech site, not from the factory manual, so it
> takes some reading and re-reading to be sure of what they mean.  It also
> looks like I can diagnose those problems without a Vag 1551, at least I
> think so.
>
>
>
> Also having come from the 200 platform up to the A6, this is my first
> exploration of OBD and OBD II.  I know one needs either the Vag 1551 or
Vag
> Com or another variant of the software for diagnosing fault codes.  How
hard
> is it to make the adapter cable for the serial port?  I am skilled in
> electronics and have plenty of experience fabricating cables, I just need
to
> know what I am connecting to.  Anyone have a pinout of the DB9 (serial
port)
> connector to the connections for the diagnostics?
>
>
>
> Other issues the car is having is intermittent check engine light under
> partial throttle.  EGR system is suspect, I need to run the test of that
> system and clean it out also, probably its just carbon build up.
>
>
>
> Otherwise, I love the car, and the wife loves her 95 A6 wagon that we
bought
> about a month earlier, though I'm still jonesing for the S6 instead heh.
>
>
>
> Thanks,
>
>
>
> Rob
>
>
>
>
>
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