Apart from the previously-mentioned defrosting issue in colder weather, the only other circumstance that would make me consider keeping a car idling a little after the start would be to not overstress the valvetrain before the oil starts to flow.
Quote:
Originally Posted by niky
I'd heard Cummins (or Caterpillar?) injects the extra fuel post-cylinder, straight into the exhaust. I still don't understand why other makers don't do this. Doesn't even have to be one of those fancy high-pressure piezo injectors... could be done with a regular old-tech injector.
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Blame it on the bean-counters.