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Re: What happens to car that idles for an extended time?
A catalyst won't be damaged because the temperature is too low. At a too low temperature they will stop working tho. A good engine can however heat up the catalyst to operating temperature in around 30 seconds after the engine is started and work even at idle.
An engine usually runs lambda 1 at idle, so gasoline dilution isn't a problem if the engine is warm. If the engine is cold started that will however be a problem and an engine will take very long to reach operating temperature when idling.
The risk of overheating the engine at idle will be very small, if it's cold outside the opposite is usually more of a problem.
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