What is the reason for Buick Hideo's high idle speed (New Hideo's high idle speed)?

The fault reason of Yinglang's high idle speed is that the throttle valve is stuck and closed loosely; Idle speed control valve failure; Water temperature sensor failure; Air leakage in the air intake system; Empty switch, power steering gear pressure switch failure, etc.

The normal idle speed of EFI engine is determined by the idle speed control valve, and the electronic control unit increases the air intake according to the engine speed, temperature, throttle switch and other signals. So as to improve the idle speed of the engine. If there is oil stain or carbon deposit, the idle speed control valve will be stuck or the throttle valve will be closed improperly, resulting in that the electronic control unit cannot accurately adjust the engine idle speed. Solution: Check the action sound of idle speed control valve. If there is no action sound, there is something wrong with the idle speed control valve.

In general, the air intake must be strictly limited. If the air intake pipe leaks, the air flow sensor can't measure the real air intake, and the electronic control unit can't accurately control the air intake, which leads to the unstable idle speed of the car. Solution: First, find the leakage point and reseal or replace the relevant parts.

Leakage or blockage of the fuel injector prevents it from injecting fuel according to the instruction of the electronic control unit, resulting in too rich or too thin mixture, which leads to poor operation of the single cylinder and unstable idle speed. Solution: Measure the fuel injection quantity of the fuel injector. If the injection quantity exceeds the standard, the injector drips oil.

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