The CO and NOx readings combined indicate a bad cat. CO above .5 is not lean at all as .5 is the ideal before the Cat. Over advanced ignition timing may also be a problem but you really need the Cat. Dennis -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Gregg Carlen Sent: Monday, February 28, 2011 4:51 PM To: vanagon@GERRY.VANAGON.COM Subject: Failed emission inspection Hey folks, Guess I'm not too suprised that something was amiss when I went for my emissions inspection today (Virginia). As many goofy things that the PO did to this van (90 Westy).... Anyway, here's the stats: At 15mph HC: 107 (limit 159), pass CO: 0.83 (limit 1.34), pass NO: 2568 (limit 1077), fail At 25mph HC: 104 (limit 155), pass CO: 0.72 (limit 1.73), pass NO: 2085 (limit 984), fail Right off the bat, I'm thinking the I'm running too lean (e.g. combustion too hot) and/or the cat isnt' doing its job. My thoughts would be to a) check the timing and b) replace the cat (there's a non-standard muffler welded onto the cat, so it will be a new cat and muffler/tailpipe; which I was planning to do eventually anyway since its louder than a stock muffler would be). Thoughts? Am I headed in the right direction? (Yes, the cat was hot when I took it in). Gregg 90 Westy |
Please note - During the past 17 years of operation, several gigabytes of
Vanagon mail messages have been archived. Searching the entire collection
will take up to five minutes to complete. Please be patient!
Return to the archives @ gerry.vanagon.com
The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.
Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.