Quote:
Originally Posted by Christ
Problem with pre-heating the cat - Engines run slightly richer during warm up as a means to heat the cat quickly. A cold cat can handle the excess fuel without gross pollution.
|
A cold cat is what results in the most pollution.
Quote:
Originally Posted by Christ
Pre-warmed cat + cold engine == engine still running rich and cat over heating.
|
AFAIK that shouldn't happen. The ECU should start reading info from the post cat oxygen sensor within a few seconds and if the mixture is too rich lean it out.
Quote:
Originally Posted by Christ
At least I think. I have no proof to back this up, other than what I know about excess fuel entering the catalyst, and causing it to heat up substantially.
|
It typically needs that heat to function properly. What can kill it is running rich all the time which will generate too muchheat and start to melt the honeycomb the catalyst is on.