Quote:
Originally Posted by boydwaters
So this is an emissions thing? And how is running the engine resulting in fewer emissions than not running it?
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It is an emissions thing.
The catalytic converter depends on heat to work. So unless it is VERY HOT, it does not clean up the hydrocarbons, carbon monoxide, etc.
So believe it or not, for those emissions it is cleaner to run the engine to keep the catalytic converter hot.
On the other hand it does raise CO2 emissions... But those aren't currently regulated.