What is the reason for the high idle speed of cars?

There are many reasons for the high idle speed of the car, for example, the throttle is stuck and it is not closed properly; Additional air valve failure; Idle speed control valve failure; Water temperature sensor failure; Pneumatic steering gear switch and pressure switch are out of order; Malfunction of positive crankcase ventilation valve; Air leakage in the air intake system; Generator charging voltage is too low.

Generally speaking, the main reason for high idle speed is that the intake air is too large or the engine control signal is wrong at idle speed. Causes of excessive idle speed include air temperature sensor failure, water temperature sensor failure, throttle position sensor failure, air flowmeter or intake manifold absolute pressure sensor failure, switch signal failure, idle speed control valve failure, throttle body failure, fuel injector failure, true /[k0/] air leakage, engine control unit failure or matching setting problem.

Solution of high idle speed of automobile engine;

1. Change the oil. When there is a problem with the idle speed of the vehicle, the first thing to look at is whether it is time to change the oil, and change it in time, otherwise the engine will be abnormal if it takes too long. Pay attention to the choice of oil. Automobile oil should be advanced, such as SJ grade or above. This kind of oil has better quality and good performance in all aspects.

2. Look at the antifreeze in the water tank. Check more antifreeze in the water tank, neither less nor more, otherwise it will affect its effect and not cool the engine well. Pay attention to antifreeze. Generally, new cars need to be replaced once every 2-3 years, or the antifreeze should be replaced once every 40,000 kilometers. According to the local temperature, choose the antifreeze with appropriate freezing point. For example, if the ambient temperature is-10 degrees, choose -25 degrees antifreeze.

3. Check the engine. If the idle speed of the vehicle is not the problem of oil and antifreeze, then check the engine to see if there is something wrong.

4. Check the oil circuit. Sometimes the idle speed of the vehicle is too high, which may be caused by oil circuit problems, such as throttle blockage.

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