by "Karl" <aufever@[EMAIL PROTECTED]
>
Feb 25, 2008 at 08:38 PM
You would be surprised at how little a EGR valve lowers NoX.
EGR lowers combustion temps to stop the formation of NoX. NoX forms when
combustion temps exceed 2500 F.
The cat controls about 95% of NoX.
"Peter W. Peternouschek" <p2ntrprs@[EMAIL PROTECTED]
> wrote in message
news:smMwj.676$0G7.657@[EMAIL PROTECTED]
> Not so fast mit der schpending off der big bucks
> Check the EGR valve, either clean or replace, also vacuum lines
> Peter
>
>
>
> "Tube Audio" <tubeaudio@[EMAIL PROTECTED]
> wrote in message
> news:ZgKwj.9550$5K1.5098@[EMAIL PROTECTED]
> > Hi
> >
> > I just had my emissions / smog check here in California and the NOx
were
> > really high. Very close to failing.
> >
> > I suspect a bad cat. I measure the temp of the cat with a fluke
infrared
> > and measured 245C or 473F. The temperature was the same at the front,
> > middle and back of the cat. The car was running at operating temp, I
did
> > this after I came home from work and the water temp was near 100C
> >
> > Shouldn't the reading be closer to 426C or 800F?
> >
> > Ideas? It looks like the original cat , the car has 175,000 miles
> >
>
