[s-cars] S6 pinging woes - the continuation

[djdawson2 at aol.com]

 You need to check your compression.? My money is on a blown headgasket between 2 adjacent cylinders.? The cylinder firing first is preigniting the second cylinder... resulting in the heavy pinging sound even at idle.

Start at cylinder number 5... seems likely to me that it is blown between 4 and 5.

Good luck,
Dave




 


 

-----Original Message-----
From: Bares, Vittorio <Vittorio.Bares at nuance.com>
To: s-car-list at audifans.com
Sent: Mon, Jul 27, 2009 7:29 pm
Subject: [s-cars] S6 pinging woes - the continuation










Hi all - so here's what I've done since the last call for help:

 

Changed Stage 3 chips out of ECU

Backed out wastegate spring to stock

Replaced O2 sensor

Replaced FPR

Replaced TPS

Replaced RS2 injectors w/stock injectors (used)

Replaced sparkplugs (NGK BKR7E gapped @ 0.025)

Was informed that the fuel pump is already relayed

 

Sparkplugs are consistent in color - they look like the car is running
rich.

I peered down into the cylinders via the sparkplug holes - all cylinders
had the same color (grayish green) and I saw no signs of damage.

 

Car pings just revving in the driveway - if I get on it, as soon as I
can hear the turbo spool, all pinging goes away - but on the way there,
there's lots of loud pinging :o!

 

The car idles slightly rough - and I *think* I can hear some noise
coming from the bottom end - very light, sounds like, I dunno, sounds
like something is just slightly loose.

 

I've thought about the coils - but I don't think this would be the
result of a bad coil would it?

 

Anything else I should check?

 

Vittorio -

 

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