[s-cars] Looking for emmissions outputs and some help

[Tom Mullane]

Brian,
 Fresh oil, a hot engine and a working crank breather system are a "must" to
pass HC at idle, but I would imagine that your tech has already BTDT. If the
car is stock other than the chip, see if someone nearby will loan you a
stock ECU for the test. A new oxygen sensor is a good thing too, if you
haven't done that yet. The last stop would be the cats; you'll find the you
need a second mortgage to afford them, or you can have them rebuilt (CT Cat
outside Hartford will do them for $250 each), or use it as a good excuse to
get a Stromung. If you do the Stromung and you still don't pass, at least
the car will sound cool. :-/
 Tom
  Date: Tue, 11 Oct 2005 22:36:05 -0400
From: Brian DeWyngaert Jr <brian.dewyngaert.jr at gmail.com>
Subject: [s-cars] Looking for emmissions outputs and some help
To: s-car-list at audifans.com
Message-ID:
<30350e3d0510111936r68bc9d98r58061277bc8dba56 at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

All I am curious to know what other UrS4s are getting on their emissions.
1.I am looking for in particular your amount of HC in ppm and your % of CO.
2.Please list which engine speed these numbers came from, idle or 2500.
3.If you could please advise if your ECU is stock or rechipped (and if
so who chipped it).

I ask because after a bit of frustration and 8 months now of replacing
parts that had gone south, I am still failing my emissions here in VA,
but only for the idle test. My results have been sitting at 186ppm for
about 4months now and they need to be below 125ppm @ idle. When run @
2500rpm my ppm is ~ 68ppm and the legal limit is 125ppm. My CO is
.10% for both tests. I have run out of ideas on what could be wrong,
and the audi tech at HBL is still scratching his head. So I am
turning to the collective brain of the list to see if some answer
might be scratched together. The only real mods to the engine (that I
am aware of) are ECS stage 1 ECU flash, a Forge DV valve, and the
adjustable wastegate mod (although I have never played with its
settings, this was done by the previous owner). One other thing to
note the dilutions determined by a 4 gas analyzer were as follows: @
idle. 14.1 @ 2500rpm 14.7
I am open to all thoughts on this, I am in the process of delving
through the archives on this list to see if something similar has come
up before.
The 2 thoughts I have,
1. did the previous owner do something to the precats or cat itself?
2. is it possible that this is a by-product of the ECS tune?