[Shotimes] Re: 93 SHO Failed Texas State Inspection

[Alan Fanning]

Overall experience in the BaySHO club with current California dyno-based
smog tests is that the non-EGR cars have a harder time passing NOx testing
vs thpse that have EGR. Some have required pulling the SPOUT connector in
order to pass.

Personally, I (and others) have found that a non-functioning EGR system
(e.g., plugged EGR passages in the intake) is likely to result in failing
the test, which I take as an indication that non-EGR cars would also have
trouble given the purpose of EGR being to reduce NOx emissions.

    Alan


Ron Porter wrote:
> 
> But, all 49-state MTXs never had EGR valves, and passed emissions just fine.
>  
> Ron Porter
> 
> Alan Fanning <Awfanning@earthlink.net> wrote:
> For cars that have it, the EGR system is a common source of problems in
> failing NOx limits due to plugging of the passageways in the intake
> manifold. In general, high NOx is caused by high combustion temperatures
> (which are moderated by a properly functioning EFR system).
> 
> Alan