Why is the idle speed high when starting the car?

[Brenda]

The reasons for high idle speed when starting the car are: 1. Throttle sticking or not closing properly; 2. Faulty idle control valve; 3. Faulty water temperature sensor; 4. Air leakage in the intake system; 5. Faulty air conditioning switch or power steering pressure switch. Idle speed refers to an operating condition when the engine is running without load. If the accelerator pedal is completely released while the engine is running, the engine is in an idle state. When adjusting the idle speed, the RPM should not fluctuate abruptly, as this can cause premature wear to the engine. The solutions for high idle speed when starting the car are: 1. Check the operation sound of the idle control valve. If there is no sound, it indicates a fault in the idle control valve; 2. Locate any leaks in the intake system and reseal or replace the relevant components; 3. Measure the fuel injection volume of the injectors. If the injection volume exceeds the standard, the injector may be leaking.