In article ,
Chris Bacon wrote:
So, how long *does* it take for a catalytic converter to "fire
up" and start working properly?

It will depend on how the car is driven and what the external temperature
is. But say about 1/2 a mile.

--
*Happiness is seeing your mother-in-law on a milk carton

Dave Plowman London SW
To e-mail, change noise into sound.