Date: Tue, 25 Feb 2003 14:24:37 -0600 From: "Walt Kienzle" <wkienzlenopsam.net> Subject: Re: Help
Maybe my memory fails me, but I thought that high NOX readings were either from a lean fuel mixture (too much nitrogen rich air) and/or excessively high combustion temperatures. The EGR valve is designed to route some exhaust gas back to the intake to reduce the combustion temperatures and NOX emissions. Most likely the thermostat is stuck open or partially open and this will cause poor gas mileage, but the emissions issue might be a different problem. Does your emissions test also measure HC (Hydrocarbons)? That would be the high reading if the fuel mixture was too rich. Walt Kienzle 1991 9000T "R Ellefson" <ellefson3nopsami.com> wrote in message news:3E5B92C3.8CB36D10nopsami.com... > I have a 88 16v non turbo, it failed the NOX emissions test. I have > noticed the it is using excessive gas in colder weather, I also noticed > that when the emissions test was being run it smelled almost as if the > car was running rich. I notice that the temp gage never gets to the > middle but stayes in the lower third of the gage. Could my problem be > excessive richness causeing both the emission problem as well as the gas > consumption increase in cold weather, and could this richness be caused > by a thermostat and or fan temp switch which are to low for cold > weather? > > Thanks > Ron >
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