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

[Paul Gailus]

It would check the O2 sensor output voltage at idle.
If the sensor and closed loop feedback are working properly,
the average voltage should be around 0.4 to 0.5 volts.
If a scope is available you can confirm that the voltage is
toggling back and forth a few times per second around this
average value.

Running the 4 gas analyzer on the output tap before the
cat would help determine whether the converter is
defective or it's just being overloaded by very high
HC input levels.

Paul

----- Original Message ----- 
From: Brian DeWyngaert <puter4m3 at yahoo.com>
To: Tom Mullane <tmullane at gmail.com>; <brian.dewyngaert.jr at gmail.com>
Cc: <S-CAR-List at audifans.com>
Sent: Wednesday, October 12, 2005 6:42 PM
Subject: Re: [s-cars] Looking for emmissions outputs and some help


> Tom, thanks for tips.
>  I had just changed the oil and added 15w-50 syn, I
> had to drive her about 35min on the highway to get to
> the place where she was tested, so she was good n hot
> and the crank breather system, I don't know about.  I
> need to see if there is a test for it.  The audi tech,
> changed my plugs cause he said they looked fouled,
> even though the plugs were only ~5mo old. The result
> was it  that it almost passed, but didnt.  So the audi
> tech took a look at the ECM and said hmm this isnt an
> audi chip and its labled high boost, so maybe the chip
> is causing your issue. His second recommendation was
> replace the O2 sensor, b/c the one I have in currently
> is rather new, but i soldered the wires, instead of
> crimping them.  The tech believes the solder "could"
> be increasing the resistance in the wire enough to
> throw off the ECU.  At this point I have accrued
> enough tech time to qualify me for the emmissions
> waiver here in VA.  But I am searching for a stock
> ECU, audi wanted 1800$ for a new one, and they wanted
> 195$ for a new O2 sensor.  Both of which I can find
> for cheaper, I just need to look for the ECU.  Again
> thanks for your thoughts.
> 
> Cheers,
> Brian 
> 94 S4
> --- Tom Mullane <tmullane at gmail.com> wrote:
> 
> > 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?
> > _______________________________________________
> > S-CAR-List mailing list
> > S-CAR-List at audifans.com
> > http://www.audifans.com/mailman/listinfo/s-car-list
> > 
> 
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