To high Nox

[Ward]

High nox is the result of high combustion temperatures, and/or a falutly
3way cat.
Ward

On Sun, 1 Aug 1999 13:55:39 -0700, Carl Summers wrote:

> Are these headers ceramic coated or stainless????
> -Carl Summers
> 
> mailto:intech at writeme.com
> Click on the above link to respond privately.
> 
> -----Original Message-----
> From:	John T. Luyster [SMTP:jtracer at fea.net]
> Sent:	Sunday, August 01, 1999 12:44 PM
> To:	gmecm at efi332.eng.ohio-state.edu
> Subject:	To high Nox
> 
> I have a 1999 Infinity QX4 that I'm trying to get a set of headers
> emission legal (Smog Exempt) in California.  My first test failed
> because of high Nox.  This is determined by a formula they come up with
> that extends the results out to at least 50K at which point my Nox
> exceeded that limit.  (It would pass a standard street smog test no
> problem)  After some investigation I found an Infinity Service Bulletin
> that suggested adding a ground wire from the intake manifold to the
> righthand cylinder head.  Further diagnostics revealved a lazy or slow
> O2 sensor at which time I replaced all four.  After this I had the
> vehicle sniffed to verify any changes.  The Nox was down substantially.
> At this time I set all the SRT's and drove approx. 50 miles to make sure
> 
> no DTC's popped up.  Off to the test lab again and failed again with
> high Nox.  This vehilce has no mods done to it.  Factory ECU. The only
> thing I can think of might cause this high Nox would be the design or
> flow of the tube off the header to the EGR on the engine.  Any ideas????
> 
> JT





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