Re: smog/oxs update fundamental question

["Bill Collins" <photo@intrex.net>]

Most (probably all) state emissions inspections test under a much more limited set of conditions than the original EPA certification.  Here in NC, they test for CO and hydrocarbon emissions at an idle.  This means that they are not testing for NOx emissions, emissions under load, etc.  The visual inspection is an attempt to catch problems that might produce high emission levels under conditions they don't test for.

As an example, an EGR system lowers emissions of NOx.  If the tailpipe sniffer can't measure NOx the visual inspection is all they have.

Bill
---------- Original Message ----------------------------------
From: "Daniel Brideau" <dan@hobbyetc.com>
Reply-To: "Daniel Brideau" <dan@hobbyetc.com>
Date: Tue, 3 Oct 2000 15:10:16 -0400

>
>> and put my heater hose back on to pass visual :)
>
>
>Can someone explain what the idea behind visual inspections for emissions
>control?  Cars emit fumes, so a nostril inspection would make sense, right?
>
>What difference do the parts you have on there make, so long as bad stuff is
>not coming out the pipe?
>
>
>Dan Brideau
>http://www.hobbyetc.com/scirocco/
>
>Control government, vote Libertarian.
>
>
>
>
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