Why does the Range Rover Velar's idle speed decrease?

[StEmily]

The reasons for the Range Rover Velar's idle speed decrease are as follows: Carbon buildup in the throttle body: As the vehicle is used over time, the intake tract can become clogged, and carbon deposits or oil may accumulate in the throttle body, leading to unstable idle speed or even low idle speed. Carbon buildup on spark plugs: Over time, carbon deposits can also form on the vehicle's spark plugs. When the carbon buildup is severe, the spark from some spark plugs may weaken, affecting the vehicle's performance and causing low idle speed. Clogged fuel injectors: When the vehicle's fuel injectors become clogged, the fuel supply pressure may be affected, leading to poor fuel atomization, which can result in unstable idle speed or low idle speed. Sensor malfunction: If there are issues with the vehicle's related sensors, the correct air-fuel ratio cannot be maintained. Common sensor failures include the coolant temperature sensor, oxygen sensor, and throttle position sensor, which can lead to high fuel consumption and low idle speed.

[VanJayce]

I often help friends with car repairs and have seen many cases of the Range Rover Velar experiencing idle speed reduction. This is usually due to excessive carbon buildup in the throttle body, where sludge blocks the air intake, causing unstable airflow; or an oxygen sensor failure, which prevents exhaust data detection, making the computer unable to control the RPM. Worn-out spark plugs can also reduce ignition efficiency. Additionally, a dirty air filter can affect air intake, or outdated ECU software with bugs may cause similar issues. Low idle speed is particularly annoying, as it can lead to engine shaking or even stalling, especially when stopping at intersections. It's recommended to visit a reputable repair shop, use a diagnostic tool to read fault codes, and then clean carbon deposits, replace sensors, or update the system to resolve the issue. For prevention, regular maintenance and using high-quality engine oil and gasoline are crucial.