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What is the function of the engine vacuum system?

1 Answers
McCaroline
07/30/25 2:01am
The following are the functions of the engine vacuum system: 1. It plays the role of brake assist in the braking system; 2. It controls the air conditioning flaps in the air conditioning system; 3. It connects the engine's vacuum pressure sensor and provides vacuum signal to the sensor. Extended content: 1. During operation, the engine draws in the air-fuel mixture into the cylinders, thus creating a vacuum. A lean mixture results in a lower vacuum level. For the vehicle, this is influenced by the exhaust stroke during operation. 2. The intake manifold generates vacuum, which is caused by the alternating intake process of each cylinder. The magnitude and stability of the intake manifold vacuum are closely related to the engine speed, number of cylinders, ignition performance, quality of the combustible mixture, and the level of vacuum.
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What do the letters on Shanghai license plates represent?

Shanghai license plate letters represent the following: Hu A, Hu B, Hu D, Hu E are for the urban areas of Shanghai, while Hu C is for the outer suburbs. Shanghai car license plates are not allocated based on administrative districts but rather in chronological order, starting with Hu A. Once all the numbers in one letter series are exhausted, a new letter is introduced. Shanghai car license plates come in four colors: yellow, blue, white, and black. The second character on the license plate is an English letter, representing the prefecture-level administrative region where the vehicle is registered. This includes prefecture-level cities, regions, autonomous prefectures, and leagues, with the letter codes generally assigned by the provincial vehicle management office based on the status of each prefecture-level administrative region. The letter A typically represents the capital city, provincial capital, or the central urban area of a municipality directly under the central government, with subsequent letters assigned without any particular order of precedence.
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What is the age of vehicles requiring biannual inspections?

Vehicles requiring biannual inspections are categorized by age as follows: 1. Passenger transport vehicles over 5 years old; 2. Freight vehicles and large/medium-sized non-passenger transport vehicles over 10 years old; 3. Small/mini non-passenger transport vehicles over 15 years old. Inspection procedure: 1. Conduct online testing by driving the vehicle into the automatic detection area for sequential checks on exhaust emissions, speed, lights, side slip, and chassis compliance. All items must pass; 2. Verify the accuracy of license plate number, vehicle type, body color, engine number, VIN code, and frame number; 3. Inspect exterior appearance including bumpers, engine compartment, mirrors, window glass, paint, engine operation status, and details of passenger compartment and wheels; 4. Owners can obtain the test report and application form from inspectors. If all items pass, proceed to pay fees and collect the vehicle license and compliance label; 5. For failed items, owners must repair and retest until passing before completing certification procedures.
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Will the electronic eye capture vehicles driving over the guide line?

Driving over the guide line will be captured by electronic eyes, typically through two methods: one is automatic capture by electronic police, and the other is manual capture by traffic police. Randomly driving over the guide line violates road traffic safety laws and regulations, resulting in a warning or a deduction of 3 points and a fine. The guide line usually consists of one or several white V-shaped lines or diagonal striped areas set according to the intersection's terrain, indicating that vehicles must follow the prescribed route and must not drive over or cross the line. It is mainly used at overly wide, irregular, or complex intersections, interchange ramps, or other special locations.
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Should Japanese cars use 0w20 or 5w30?

Japanese cars can use 0w20 because the engines in Japanese cars have a precise structure, with smaller gaps between the piston rings and cylinder walls, and the piston skirts are designed with molybdenum plating to reduce the friction coefficient. The symbol 'w' stands for winter, which is an abbreviation of 'Winter'. The number before 'w' represents the low-temperature flow performance of the oil. The smaller the number, the better the cold resistance; the larger the number, the weaker the cold resistance. Engine oil, known as the 'blood' of a car, serves to lubricate, clean, cool, seal, and reduce wear in the engine. The viscosity standard adopts the SAE viscosity classification, which is used to distinguish the different temperature ranges suitable for the lubricating oil. The performance standard mainly adopts the API performance classification, which is used to distinguish the performance and quality of the lubricating oil.
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What is the function of a car's charcoal canister?

The function of a car's charcoal canister is to prevent fuel vapors from escaping into the atmosphere after the engine stops running. Gasoline is a highly volatile liquid, and at normal temperatures, the fuel tank often becomes filled with vapors. These vapors can escape into the atmosphere, leading to air pollution. Therefore, vehicles are equipped with an evaporative emission control system, which directs these vapors into the combustion process and prevents them from evaporating into the atmosphere. The key component of this system is the charcoal canister, which contains activated carbon. Situations that require checking the charcoal canister include: 1. When the engine is running at non-idle speeds, if you occasionally hear a clicking sound, and this sound is emitted by the canister's electronic valve, it is normal. If the sound is not from the electronic valve, a thorough inspection is needed. 2. If you experience vehicle hesitation when accelerating by pressing the throttle, accompanied by a strong gasoline smell inside the car, special attention should be paid to whether the pipes in the charcoal canister system are damaged. This indicates that the vapors from the fuel tank are not being absorbed by the charcoal canister and are instead entering the car's interior.
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What are the penalties for drunk driving?

Penalties for drunk driving: 1. The traffic management department of the public security authority shall restrain the driver until sober; 2. The driver's license shall be revoked and criminal liability shall be investigated according to law; 3. The driver shall not re-obtain a driver's license within five years. According to relevant regulations, those who drive under the influence of alcohol on the road will no longer be subject to detention penalties but shall be investigated for criminal liability according to law. A driver with a blood alcohol content greater than or equal to 20mg per 100ml but less than 80mg per 100ml is considered driving after drinking; a driver with a blood alcohol content greater than or equal to 80mg per 100ml is considered drunk driving.
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