What Causes High Engine RPM in Winter?

[SadieRose]

High engine RPM in winter is caused by reasons such as not warming up the car before driving, severe carbon buildup in the engine, or faults in the engine's intake system or pipelines. Not warming up the car before driving: It is necessary to warm up the car before driving. Generally, warming up for about half a minute is sufficient; prolonged warming up is not required. Then, gradually accelerate to avoid damaging the car's engine. Severe carbon buildup in the engine: Dirty throttle body or excessive carbon deposits in the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. In this case, the carbon deposits should be cleaned promptly. Faults in the engine's intake system or pipelines: It is recommended to inspect the intake system or pipelines; check the throttle body (including sensors); inspect the coolant temperature sensor; examine the fuel injectors and ignition system; and check the accelerator pedal and its sensor.