Does a Cold Engine Consume More Fuel Than a Warm Engine?

[McBrooke]

Cold engines consume more fuel. The following describes the performance of an engine when cold: 1. Significantly increased noise: Noise is noticeably louder when starting a cold engine. 2. Higher fuel consumption: In the closed-loop electronic control system of the engine, there is a low-temperature warm-up correction process for the fuel injection quantity. To quickly reach the operating temperature and maintain engine idle speed and performance, the fuel injection quantity is appropriately increased, thereby increasing fuel consumption. 3. Higher idle speed: At low temperatures, all aspects of engine performance decline, making it unable to maintain the normal idle speed of 600-700 rpm. The engine control system actively increases the idle speed to maintain normal operation.