[200q20v] hesitation, hiccup revisited...new clues

[Paul Waterloo]

Could it be the honeycomb in the cats is breaking loose and causing a
significant restriction? Seen in before on many cars, but I don't know if
your symptoms match that....
_____________________________________________________
Paul Waterloo
Applied Energy Services
Phone 708-524-9464
Fax 708-524-0079
Cell 312-961-2523
pwaterloo at compuserve.com


----- Original Message -----
From: <Tresturbos at aol.com>
To: <200q20v at audifans.com>
Sent: Monday, June 04, 2001 3:30 PM
Subject: [200q20v] hesitation, hiccup revisited...new clues


>
> Hi list,
>
> A couple of months ago I wrote about some hesitation or jerkiness under
> medium to low throttle at no particular point along the rpm band (not just
> down low, I ain't no lugger :-)
>
> While away on vacation, I left it with an Audi/Porsche mechanic.  All they
> could come up with is that the roughness was typical for a manual
> transmission Audi, especially at low revs.  When I told them that it was
not
> at low revs, but rather during 3-5k rpms, they didn't have an answer.
They
> had checked the O2 sensor and the plugs.  Nothing looked fouled-up.
>
> Over the past few weeks, I've paid close attention to the conditions under
> which the hesitation occurs, and have noticed that it is accompanied by a
> muffled metallic sound emanating from the rear of the car.  I believe it
is
> at the rear passenger side.  It's almost like light metal on metal contact
> that sort of flutters when the hesitation occurs.  There's definitely a
loss
> of power that accompanies the sound.  It seems to happen anywhere between
> 3-5k rpm, yet doesn't seem to correlate directly with rpm as do many
exhaust
> buzzes.  It does not occur under wot or near wot.
>
> Under load and throttle, I hear another sound that two mechanics have
> suggested to be due to a worn center load bearing.  The drive shaft
touches
> the exhaust.  Apparently a new bearing would lift the drive shaft up and
away
> from the exhaust.  I'm planning on saving this replacement for when I
> eventually replace the exhaust.
>
> Anyhoo, any ideas about the source of the hiccup would be greatly
> appreciated.  Maybe it would help in directing the mechanics to the
problem.
>
> TIA,
>
> Mitch Frey
> '91 200tq IA Stage 3
> '00 A6 2.7T
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