Looking at these numbers, your problem is unburned hydrocarbons. You need
to look for ignition or lean miss fire or an exhaust valve problem. You
are very close. Based on the CO NOx your Catalyst is working, but it just
doesn't have enough capacity to finish off the HC. Almost all aftermarket
cats do not have the same capacity as OEM. Emicco is the closest for the
Vanagon but still does not have as much active material. If all is well,
you should have near 0 HC before the Cat anyway.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
mordo
Sent: Wednesday, December 05, 2007 7:58 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Emissions failures make me feel like a failure

Maryland emissions are driving me crazy.I just failed a third test this
evening.

My previous test on 1 November gave these results:

                                      HC
CO                   NOx

standard                         2.40 GPM       80.00 GPM       3.00 GPM

mine                               0.9921 GPM    12.3648 GPM    4.2152 GPM

I subsequently replaced the oxygen sensor, catalytic convertor, spark
plugs
and wires.

I got these results this evening:

                                       HC
CO                   NOx

standard                         2.40 GPM       80.00 GPM       3.00 GPM

mine                               0.4208 GPM   5.8560 GPM      3.1568 GPM

I am now at a loss to know how to proceed to get it to pass. I know what
to
do to get a waiver but I'd like to know what goes on. What are the likely
causes? Incidentally, the cat conv I replaecd appeared to be in fine
condition.

What do we think? I would like to hear some wisdom.

Cheers,
--
mordo
1990 Carat