How to solve the problem of high idle speed of automobile

Adjust the idle motor and clean the throttle.

1. When the engine water temperature is low and the engine voltage is low, the electronic control unit shall be programmed to appropriately increase the idle speed. Under this normal condition, if the engine water temperature is normal, the idle speed is high, and there is no air opening adjustment, it means that there is something wrong with the system, whether it is an electronic control system or a mechanical system.

2. When mechanical failure leads to high idle speed, it is important to check whether the intake pipe leaks, whether the vacuum pipe falls off or is damaged, and whether the intake pipe is damaged (the intake manifold of Volkswagen engine is mostly rubber pipe). Because the air intake of the engine is very small at idle speed, if there is air leakage, the idle speed will be too high.

3. The leakage of fuel injector may lead to excessive fuel supply, which may lead to higher idle speed than normal.

4. For EFI vehicles equipped with fuel vapor recovery system, fuel vapor should not enter the intake pipe at idle speed. If fuel vapor is sucked into the intake pipe at idle speed due to system failure, the idle speed is higher than normal.

5. After cleaning the throttle body and idle speed control valve, the idle speed may be high after starting, which is a learning process for the computer. Because the throttle valve and idle speed control valve were dirty before, the engine idle speed would decrease, and ECU would control the opening of idle speed control valve or throttle valve and increase the intake air to stabilize idle speed. After cleaning, the ECU also controls the air intake according to the original opening, and the engine idle speed will increase.

Note: Idle speed refers to a working state. The idle speed of the engine is called idle speed, that is, the gear of the car is neutral. The engine speed at idle speed is called idle speed. You can adjust the idle speed by adjusting the size of the throttle. Idle speed means that the engine "works without output".

When the engine is running, if the accelerator pedal is completely released, the engine will idle. When adjusting the idle speed, the speed should not suddenly rise or fall, otherwise it will cause early wear and tear to the engine, so it is best to go to the automobile maintenance department for adjustment.

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