S6 "sputtering" puzzle

[Tigran Varosyan]

This sounds to me like classic spark plug blowout. 

Change out your plugs, if that does not help, it is likely that the ignition
system on your car is getting tired. Wires, coil, distributor, PTU (if you
have one)... 

You can often bandaid the problem by gapping down your plugs .02-.06 from
whatever the stock recommendation are. I am not very familiar with your
motor and its particular quirks - but I am a pretty versed Turbo guy and
based on your description, I would bet my $0.02 that spark blowout is your
issue.

Tyson Varosyan
Technical Manager, Uptime Technical Solutions LLC.
tyson at up-times.com
www.up-times.com 
206-715-TECH (8324)
UpTime/OnTime/AnyTime 

-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
Behalf Of DGraber460 at aol.com
Sent: Sunday, March 11, 2007 3:27 PM
To: s-car-list at audifans.com
Cc: quattro at audifans.com
Subject: S6 "sputtering" puzzle

My 95 URS6 has been demonstrating some strange behavior that I cannot  
diagnose.
Back in December my Inter-cooler sprung a leak. It was relatively easy to  
find the problem with a pressure test and I replaced it thinking I had cured
its 
 ills.
About then we started to accumulate snow that finally stopped  somewhere 
between 70-80 inches total. The roads were so packed and rough that we
broke the 
oil pan on our A6 dropping on all the unavoidable holes  etc.
Anyway, now that the roads are passable I find the car  still "sputters" at 
WOT and full boost. It doesn't buck or cut out it just  sputters. If I
peddle 
it to maintain below 17 it pulls like a train. Go to  WOT and 20 or above
PSI 
and she sputters badly. Prior to all this it was  running 27 full boost very

nicely.
I have pressure checked it twice with a stethoscope very methodically  and
it 
holds pressure even after I take the regulator off. It also  blinks no
codes.
Any usual culprits for such misbehavior?
Any advice greatly appreciated.
TIA  
 
Dennis
Denver
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