Subject	High NO indicates lean mixture. If you look at
Posted by	JMartz on August 27, 2013 at 9:24 AM
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In Reply To	Didn't pass smog in CA posted by ZKutch on August 26, 2013 at 11:59 PM
Message	a chart of a/f ratio on the x-axis versus NO and HC on the Y-axes, on the low a/f values (near the origin), NO rises and HC drops; on the higher a/f values, HC rises and NO drops. I believe the catalytic converters work to reduce HC emissions by promoting oxidation on the platinum surface. NO is "controlled" by EGR and a/f ratio. Perhaps you should check your catalytic converters (they do age and loose efficiency) as well as the temperaure of the coolant. NO rises with temperature. Leaner means hotter but there is also the actual engine temp.
Follow Ups	Didn't pass smog in CA - ZKutch 23:59:25 08/26/13 High NO indicates lean mixture. If you look at - JMartz 09:24:24 08/27/13 Re: High NO indicates lean mixture. If you look at - ZKutch 10:40:40 08/27/13 Your test indicates no problem with the cats. You - JMartz 12:02:30 08/27/13 Try searching this site for info on passing emissions. - zellamay 11:03:58 08/27/13 Re: Didn't pass smog in CA - Cjw3 11:25:07 08/27/13 Re: Re: Didn't pass smog in CA - ZKutch 19:33:41 08/28/13 the egr was soley made for nOX... - inf 13:09:23 08/27/13 Re: the egr was soley made for nOX... - ZKutch 19:35:19 08/28/13 Have to retard the CAS timing with no egr. (n/m) - Woody75 (Denver) 13:22:59 08/27/13 Re: Didn't pass smog in CA - dumbazz 20:36:56 08/27/13
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