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What happened when the idle speed dropped to 600 rpm after hot car? Tell me if you know anything.

Hello, this is normal. At present, in order to save fuel and reduce wear, the EFI vehicle generally has a water temperature sensor, which provides a signal to the engine control module ECU, and the engine control module ECU changes the fuel injection quantity each time according to the signal provided by the water temperature sensor to meet the different requirements of the engine for fuel supply under various working conditions. ...