Junk it.  Too many Vanagons clogging up the roads anyway.

Or, maybe try getting the injectors cleaned.  Good spray patterns promote
better combustion.
You could try a miracle-in-a-can fix, like Seafoam.
How old are your plugs and ignition components?  Did you do a spark
intensity test?  Compression test?

Lots of stuff to tinker with on these old vans...

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
David M
Sent: Friday, July 19, 2013 4:15 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Failed emissions for third time

I posted a while back about my 1987 Vanagon failing the AZ emissions on CO
and NOX levels.
The place I took it to said it was running rich and they adjusted the timing
and mixture. Then th