NOx is caused by excessively high combustion temperatures. Usual causes are a lean fuel mixture or over advanced ignition timing. Since the Vanagon does not use EGR, the engine settings are extremely critical. The Cat has the major job of reducing the NOx and all aftermarket cats do not have as much active material as the original so they do not last that long. Dennis -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Mike Miller Sent: Friday, September 09, 2005 12:09 AM To: vanagon@GERRY.VANAGON.COM Subject: NOx high Vanners, My van passed smog but the NOx was just below the maximum. New cat two years ago. Any likely causes to look at? TIA Mike |
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