What Causes High Engine RPM in Winter?

[VonMariana]

Generally, when starting a car in winter, the engine RPM tends to be higher. Due to the low temperatures in winter, the vehicle's computer (ECU) automatically adjusts the engine's operating parameters based on inputs from temperature sensors to facilitate warm-up. Once the engine temperature rises, the idle speed should decrease to normal levels, indicating no issues with the vehicle. If the high RPM persists, it suggests a problem with the car that requires inspection and troubleshooting at a repair shop. It's necessary to warm up the car before driving, but this typically only takes about half a minute—prolonged warm-up is unnecessary. After warming up, gradually accelerate when starting to avoid damaging the engine. Additionally, severe engine carbon buildup and clogging can also lead to high engine RPM.