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Re: Carbon Build Up
Posted by Stephen Goldberger (more from Stephen Goldberger) on Mon, 13 Nov 2000 09:57:40
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>the NOx reading was VERY high (935 allowable, mine was
>over 2400).  At first I was told it was a simple mix adjustment, when that
>didn't work, I had the catalytic converter replaced.  Now, I'm being told
>that I probably had carbon build-up

Does this model use EGR?  Hard to imagine carbon build-up so severe as to
cause that much NOX and the car still be driveable.  At this point I'd
suspect the replacement catalytic converter.  It's simple chemistry - well,
complicated chemistry - the products of combustion, in the presence of the
catalyist, combine to form H2O and CO2 - *IF* the mixture is stochiometric
(14.6:1).  High NOX usually indicates lean running.  BTW, was the O2 sensor
replaced along with the cat?
Stephen Goldberger, Editor and Publisher
NINES, the magazine of the SAAB Club of North America
vist our web site at http://www.saabclub.com

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