Unlike starting the car in the afternoon, after you've already started it at another time of the day. I understand that the higher RPM can be because of the temperature, however on hot days it's still the same.
Are there any other reasons besides temperature?
I have a 1.5 Manual Honda Mobilio.
All ambient temperatures are below engine operating temperature, so you'll still get "cold engine" behavior on a hot day unless you drove the car recently.
Every car is different and will have a different cold start process, but coolant temperature is the dominant factor in whether this behavior triggers on the cars I'm familiar with.
you would be surprised how hot the engine can be and the ECU will still raise the idle. for example on my 1999 Nissan Almera 1.6 liter the computer will raise the idle until the engine reaches 80 degrees Celsius. I have verified this with a scan tool.
