[s-cars] Re: Emissions Question (NTC- no turbo content)

[William Noland]

One item that can cause high HC is a bad thermostat. On the S-Car, if 
the coolant temp doesn't consistently make it to the first bold 
hashmark, the thermostat is probably toast. Is the Coupe coming up to 
temperature properly.? Just a guess -- members of the same family and all.

Bill Noland

>The Coupe, however is a different story.  Not a turbo,
>but is a 20v.  Perhaps the list can impart a bit of wisdom?
>
>Anyway, the test measures CO and HC at speed (whatever that means) and at
>idle.  CO is fine both cases. HC is fine at speed, 151 ppm out of 220
>allowed, but HC is high at idle, 351 ppm versus 220 allowed.  There is
>nothing wrong with the car; I have been through the Bentley and checked just
>about everything I can think of, and the tune up items are within 10k from
>the time they were replaced.  Friends at Audi claim that the 20v cars can be
>difficult to get through emissions; they say it is simply the nature of the
>beast.  Several people suggested that I should change the oil, and get the
>car red hot before going back.  I will do both of these things.
>
>My question is this:  does anyone have any tips for lowering the HC?  
>
>  
>