Why is the car's RPM particularly high?

[DiCorey]

An unusually high car RPM may be caused by a faulty idle control valve, air intake system leaks, or fuel injector dripping/blockage. Below is relevant information about car idling: 1. Definition of car idling: Idling is an operational state of a car where the engine runs in neutral gear. The engine speed during idling is called idle speed. Idle speed can be adjusted by modifying throttle opening size, etc. Idling means the engine is "producing power without doing work." When the accelerator pedal is fully released during engine operation, the engine enters idling state. 2. Causes of unstable idling: Direct causes refer to mechanical components being dirty, worn, or improperly installed, leading to variations in individual cylinder power output. This creates imbalance among cylinders, resulting in unstable engine idling. Indirect causes refer to abnormalities in the engine's electronic control system that cause poor fuel mixture combustion, making it difficult to balance cylinder power output and resulting in unstable engine idling.