What was the failure? Did they have dyno to test the NOx emissions to know they were still high? Yes sometimes a cat can be fouled up and driving may clean it. A sign of a cat failing is that it takes too much time to "light up" and do its job. High NOx is usually caused by over advanced ignition timing, an excessively lean mixture or excessive load. The Cat is the only device on the Vanagon to clean it up. Dennis -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of David M Sent: Wednesday, July 10, 2013 2:40 PM To: vanagon@GERRY.VANAGON.COM Subject: Emissions - does this sound right
Took my Vanagon in for diagnosis/repair after it failed emissions . I'm not sure I can beleieve anything this shop says but they said it was running rich and they adjusted the timing. They said this fixed the CO levels but the NOX levels are still borderline. They said because it had been running rich, I need to take the van away and drive it hard for around 50 miles to clean out the cat. Does this sound right? Sounded weird to me. David (1987 Wolfsburg) |
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