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In order to meet emission requirements the cc has to be at a certain
minimum temperature. A sensor monitors the cc temp and tells the car's
computer to run the engine at high enough rpms to bring the cc up to temp.
For a hybrid that may mean going from zero rpms to finite rpms. For a
non-hybrid that may mean increasing the idle speed.
(These days you don't "drive" a car, you just point it. The computer
drives it!)
Mark
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