Excessive CO is always mixture or passing oil. All three gasses being high
also indicates a failed catalyst. Do you have CIS-e with the O2 sensor?
Make sure that is working. Other wise the mixture s adjustable. Also, make
sure the timing is not over advanced and get the idle speed up around
850-950 rpm.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Bill MacLachlan
Sent: Monday, October 01, 2007 10:55 PM
To: vanagon@GERRY.VANAGON.COM
Subject: I4 emission issues

Hi all...I'm having a time passing the emissions testing this year.
Get through easily for the past ten, but this time around........I've
not passed twice in a row.

first test failed on excess CO at idle; all emissions(Hydrocarbons,
NOx CO )  were significantly higher than the previous year.

replaced plugs rotor cap, set the timing.

second test: emissions down from the first test,but failed on CO2 at
idle and CO on the driving test.

something is not right.

huh.

Engine is an inline 1800cc with CIS. Hall effect ignition.  I'm
thinking of pulling the injectors and replacing them, and changing the
airfilter too ( duh why didn't I do that before???????).  One thing
that's concerning me is that the idle isn't rock solid- it varies by
50-100rpm above the 800 mark. Vacuum leak somewhere perhaps?

Suggestions on the above? I know it's a bit of an unusual set up
engine, but what I'm looking for here is the general
experienced-with-engines feedback that this list can be soooooo good
at - and if there's someone out there who's got gobs of 50 degree
VanagonI4 experience, I'd really appreciate your insight.

thanks all

BillM
82GLI4
Vancouver BC