High CO along with high NOx points to both a bad O2 sensor and catalyst. A number of states including New York are adopting the California standards which include no after-market catalysts because those just don't work as well or for as long as they need to. There are CARB approved units available for the Vanagon. A non-working O2 sensor will help to ruin the Catalyst. So too will any miss-fire situation, coolant into the engine, certain sealants used on gaskets, bad injectors, etc. Dennis
-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of David M Sent: Saturday, June 15, 2013 3:43 PM To: vanagon@GERRY.VANAGON.COM Subject: Emissioins test failure My 1987 Vanagon failed its Arizona emission test this morning. Results were Hydrocarbons (HO) grams/mile .75 limit 1.60 (passed), CO grams/mile 25.73 limit 15 (failed), NOX grams/mile 2.91 limit 2.5 (failed). I have the standard printed list of what might cause these results. The last time it failed 2 years ago, it failed only the NOX reading and I had to get a new catalytic converter that cost over $500 I've noticed the low-speed engine fan comes on a lot more than it used to and sometimes it even goes to high-speed which is a scary thing because it makes the entire vehicle vibrate and I can feel it through the gas pedal. According to the testing station you can request a second-by-second graph of the emissions test but they will only fax it to a repair shop. |
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