[s-cars] Emissions and O2 sensor musings

[Tom Mullane]

Mark,

My money's on the oil change.  BTDT in the Coupe Q.  Now I always change my
oil immediately (5 minutes) before going to emissions.

I don't really see any big changes in the CO and HC, so my guess is that the
OXS is healthy.

Tom

Date: Tue, 10 Aug 2004 17:02:07 -0400
From: Mark Pollan <mark.pollan at mci.com>
Subject: [s-cars] Emissions and O2 sensor musings
To: s-car-list at audifans.com
Message-ID: <005c01c47f1d$4c344690$18209283 at mcilink.com>
Content-Type: text/plain; charset=us-ascii

Hi all:

 

The patient is a 95.5 S6 with MTM1+ chipset.  In April I failed emissions
due to high NOX.  Today she passed with "flying" colors.  Only difference(s)
was a new O2 sensor (old one only had 20K miles on it), full set of Samcos,
oil change with Techron in the last tank before change, and I drove her hard
for about 10 miles before going to the emissions station.

 

Below are the results of my two tests:

 

                                    HC (GPM)                     CO (GPM)
NOX (GPM)

State Limit                    1.0000                          20.0000
2.2000

Failed Results               0.5230                          4.4715
5.0118

Pass Results                 0.0915                          5.5075
0.9592

 

Any thought out there as to which of the above "changes" from FAIL to PASS
my have driven these results?  And on that subject, is there anybody willing
and able to test my old O2 sensor?

 

Like I said, just ramblings and musings so if there are no takers that's
cool but I sure am curious.

 

Regards,

 

Mark