[s-cars] dropped a coil -> Ignition problems

[Ben Swann]

Similarly, I have been chasing a miss problem for some time.  The overall outcome was a
combination of things, starting with leaking cam cover gasket.

I replaced plugs - new Denso IK22 Iridium (not cheap) ; checked wires, new cap & rotor.
Ealier I had obious mis on cyl #1 and # 3 caused definatatively by the oil leaking into
the plug wells.  Replacing the Cam Cover Gasket resoled it , but only breifly and came
back intermittantly then continuaously.  I was considering fuel pressure, since I am
running 3 bar and the problem is more pronounced under boost.  However, more and more
rough running appeared at startup, so I pulled plug wires again.  This time it seemed #2
was not dropping RPM like the others.  Checked wire and plug 0 they wer sparking and put
the Denso back again.  Still it missed.  Pulled the DENSO and put back an old BOCSH.
That was it and I can boost to high heaven at nauseum
at least until something else
degrades.

The DENSO plugs are only a few months new!  I think one was defective out off the box -
you cant tell by looking and passes test, but fails under boost.

Ignition problems can result from a number of  reasonbs are general cause of bad running
especially under load/boost. They are first suspect when car was running well with no
other obvious changes.

Ben

[Date: Wed, 01 Sep 2010 10:40:34 -0400
From: Robert Myers <bob at chips-ur-s.com>
Subject: [s-cars] dropped a coil
To: "S-CAR list" <s-car-list at audifans.com>
Message-ID: <auto-000000811430 at chips-ur-s.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

*This message was transferred with a trial version of CommuniGate(r) Pro*

Hi Y'all,

It is seldom that one gets to report a simple repair.  I had to run 
an errand this morning and just for kicks I drove the RS2ed 
urS6.  (With the 1.8t coil mod.)  On the way back home came the 
unmistakable single cylinder miss of a dropped coil.  Pulled into the 
garage and checked to find the dead coil at cylinder #4.  Unplugged 
the coil, got into the box of spare coils in the trunk and plugged in 
a new coil.  Bingo!  The miss is fixed.  So simple.

This report is probably a big mistake.  The Audi gods are likely to 
come after me now.

Bob

]