[s-cars] Need Input from Group

[Varon H. Fugman]

I had the rotten egg smell with a recent POS failure.  Lots of unburned
hydrocarbons going into the catlytic converter.  However, the only code I
pulled was 4421 for driving a few miles with the #5 cylinder's injector
unplugged.  I was surprised I didn't throw a 2413, since I could smell the
rotten eggs, at least when stopped at idle.

Greg, is it consistantly running rough at idle?  Can you isolate the problem
to one cylinder by disconnecting injectors one at a time?  The one that
doesn't make it run even worse is your problem.  If you can locate a problem
cylinder, then it is time to swap the POS modules to see if the problem
moves to a different cylinder.  If it moves, it is POS, if not, it is coil
pack or something else.

In case you are not already familier with this fantastic write-up on
troubleshooting POS issues:
http://www.sjmautotechnik.com/trouble_shooting/S4_Ignition.htm

Varon
'95 S6 with *two* recent POS failures


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Gregory Wolters
Sent: Wednesday, September 01, 2004 11:42 AM
To: S-CAR-List
Subject: [s-cars] Need Input from Group


Hi S-Car Folks,

I had a problem develop last night and I really need
some guidance from the group.  The patient is a 94 S4
with just under 135 K on it.

Coming home last night after picking up a pizza, car
running fine.  Drive home, all city driving, get to
uphill driveway and car starts to stumble, push in the
clutch, seems to be better at higher revs, I get up
the driveway and can smell to rotten egg smell.  A
couple of hours later I drove it again a couple of
blocks and got the same smell along with the smell of
gas.

Pulled code 2413 this AM.  Michelin Man hose has been
replaced 18K ago when I pulled the same code on hard
acceleration.  New O2 sensor 23K ago.  New plugs and
boots 14K ago.

My thoughts are to check the POS, check/clean MAF
connections.  I also think the multi temp sensor thing
is original.

Any input would be great.  Luckily I was able to
borrow a car to take my Mom in for eye surgery this
morning.  I need to get the S4 running ASAP (as
usual!).

TIA.

Greg
94 S4
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