S6 "sputtering" puzzle

[Tigran Varosyan]

You may find a better explanation on google. As I understand it, compression
makes it harder for a spark to jump the gap of the plug. It is an
exponential ratio - more compression makes it harder to jump the gap. Hence
it is common on turbo cars to reach a certain boost level where ignition
just simply does not happen as soon as you reach a certain pressure. 


The solution is to either make the spark stronger so that it can make the
jump, or to reduce the distance that it has to jump.

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 Vittorio Bares
Sent: Sunday, March 18, 2007 6:56 AM
To: quattro at audifans.com
Subject: RE: S6 "sputtering" puzzle

What exactly is spark blow out? Just that? Like a candle in the wind?
Not sufficient spark to cause ignition of gasses?

-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com]
On Behalf Of Tigran Varosyan
Sent: Sunday, March 18, 2007 4:02 AM
To: quattro at audifans.com
Subject: RE: S6 "sputtering" puzzle

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
<BR><BR><BR>**************************************<BR> AOL now offers
free 
email to everyone.  Find out more about what's free from AOL at 
http://www.aol.com.
_______________________________________________
quattro mailing list
quattro at audifans.com
http://www.audifans.com/mailman/listinfo/quattro
---
Watch this space for ads :)

_______________________________________________
quattro mailing list
quattro at audifans.com
http://www.audifans.com/mailman/listinfo/quattro
---
Watch this space for ads :)
_______________________________________________
quattro mailing list
quattro at audifans.com
http://www.audifans.com/mailman/listinfo/quattro
---
Watch this space for ads :)