Why is it necessary to replace brake fluid regularly?

What Causes Engine Abnormal Noise After Removing the VVT Valve?

Removing the VVT valve causes engine abnormal noise, which may stem from engine issues, transmission problems, or wear-related sounds. Engine Abnormal Noise. Symptom Description: There are various possibilities for abnormal noises in the engine compartment. Most people identify the source as coming from the engine compartment, typically manifesting as sharp metallic sounds or whistling noises. Solution: Engine abnormal noise indicates a change in the technical state of a certain engine mechanism, mainly caused by excessive wear of some parts or improper assembly and adjustment. Some noises may even forewarn of potential catastrophic engine damage. Therefore, when abnormal engine noise occurs, timely repairs are essential to prevent further damage. If the noise originates inside the engine, the owner usually cannot resolve it independently and should seek professional repair services. Transmission Abnormal Noise. Symptom Description: If there is a "rustling" sound inside the transmission while driving, which disappears when the clutch or accelerator is pressed, and a whistling-like sound occurs during gear shifting. Solution: Transmissions have many components, and the causes of noise are complex. When analyzing and judging, pay attention to: whether the noise is related to specific speeds, such as some planetary gears being more noticeable at around 50 km/h; whether it is related to certain gears, which is crucial for diagnosing transmission faults—if a specific gear produces noise, it is certainly related to the components affecting that gear's transmission; if all gears produce noise, it often indicates a fault in the constant-mesh gear shaft or insufficient transmission oil. Also, observe whether the noise is related to specific actions, such as gear shifting, starting, rapid acceleration, deceleration, or turning, which are effective means of diagnosing abnormal noises. Changing speed and direction is particularly important for identifying rear axle faults. If transmission noise is significant, it is recommended to send the vehicle to a professional repair shop to identify the faulty component and replace it. Wear-Related Abnormal Noise. Symptom Description: When pressing the accelerator or brake, there are always some abnormal noises from certain parts of the car body. The sound is not loud and does not affect normal driving, but it raises concerns about potential faults. Solution: Door abnormal noise is mainly caused by insufficient lubrication. However, it is necessary to determine whether it comes from the door hinges or internal components like the window regulator, door lock mechanism, or handle mechanism. For door hinges or limiters, use specialized door hinge and slide lubricants. For internal components like window regulators, door lock mechanisms, or handle mechanisms, use specialized door accessory lubricants. Choose brands commonly used by 4S shops, such as German Marty, Kluber, Hotolube, or Fuchs. Avoid using engine oil or ordinary grease, as they may freeze in winter and emit harmful odors that affect health.

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Should the car air conditioning be turned off when parking?

It is necessary to turn off the air conditioning before parking. Here are the specific details: Hazards: Turning off the engine before turning off the air conditioning is harmful to the engine, because when the vehicle is started next time, the engine will start with the load of the air conditioning, and such a high load will damage the engine. The best practice: Turn it off a few minutes before reaching the destination, which allows the natural wind to blow, bringing the temperature inside the air conditioning ducts back to normal, eliminating the temperature difference with the outside, thereby maintaining the relative dryness of the air conditioning system and preventing the growth of mold. Moreover, the air conditioning should only be turned on two or three minutes after the vehicle is started, when the engine has been lubricated. Incorrect operation of the car air conditioning not only affects the performance and lifespan of the air conditioning system but can also harm the health of the occupants.

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What is the purpose of chassis armor?

Chassis armor serves the following purposes: 1. Anti-corrosion: Chassis armor is non-toxic, has high coverage and adhesion, and quickly forms a strong elastic protective layer after drying to prevent rust and corrosion on the chassis. 2. Vibration damping: The engine and wheels are fixed to the car floor, and their vibrations can resonate with the floor at certain frequencies, causing discomfort. Bottom protection eliminates this resonance. 3. Heat insulation and fuel savings: When the car's air conditioning is on, cold air sinks downward while outside ground heat rises upward. Most of the cold and hot air exchange occurs on the vehicle floor. The effectiveness of the vehicle's bottom protection directly determines the efficiency of cooling energy utilization. The honeycomb structure and sound-absorbing factors in the chassis armor film completely isolate the cold and hot air.

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Is it possible to have the vehicle inspected without the owner's ID card?

It is possible to have the vehicle inspected without the owner's ID card, but the agent's ID card is required. Below is an introduction to the relevant content of vehicle inspection: 1. Annual inspection of personal vehicles: The required materials are the original vehicle license, the copy of compulsory traffic insurance, a copy of the ID card, and the vehicle. 2. Annual inspection of company vehicles: The required materials are the original vehicle license, the copy of compulsory traffic insurance, a copy of the agent's ID card, and the vehicle. 3. Time limit: Therefore, whether it is the annual inspection of personal vehicles or company vehicles, the required materials are not complicated. At the same time, motor vehicles can apply for annual inspection work within three months before the annual inspection expiration date.

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What are the mnemonic rhymes for the lighting test in Subject 2?

Here are the mnemonic rhymes for the lighting test in Subject 2: 1. Starting the engine and turning on the turn signal: Subject 2 emphasizes turn signals, keep them in mind and don't forget. Don't rush when starting the engine, turn on the left turn signal in sequence. 2. Parallel parking: When exiting during parallel parking, and also during right-angle turns. Only proceed when the left signal is on, and don't forget the hill start. Below is extended information on the lighting requirements for Subject 2: 1. Vehicle start: Turn on the left turn signal when the vehicle is just starting. 2. Hill stop: In the hill stop and start project, also turn on the left turn signal when starting. 3. Parallel parking: Turn on the left turn signal when exiting during parallel parking. 4. Right-angle turns: Turn on the left turn signal during right-angle turns.

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How Many Items Are There in the Automatic Transmission Subject 2 Test?

Here are the contents of the automatic transmission Subject 2 test: 1. Item introduction: There are five items in total, including reversing into the garage, stopping and starting on a slope, parallel parking, curve driving, and turning at a right angle. 2. Notes: All five test items must be passed at once to be considered a pass. These five items are the nationally unified compulsory items for Subject 2. In some regions, such as Shanghai, there are 9 items, while in Zhejiang and Fujian provinces, 6 or 7 items are tested this year. 2. Test opportunities: There are two test opportunities for Subject 2, meaning one test and one retake. If the first test is failed, a retake is conducted immediately. Those who fail the retake need to schedule the test again after 10 days.

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Why is it necessary to replace brake fluid regularly?

What Causes Engine Abnormal Noise After Removing the VVT Valve?

Should the car air conditioning be turned off when parking?

What is the purpose of chassis armor?

Is it possible to have the vehicle inspected without the owner's ID card?

What are the mnemonic rhymes for the lighting test in Subject 2?

How Many Items Are There in the Automatic Transmission Subject 2 Test?

Can You Drive with the Power Saver Enabled?

Can I Report a Noisy Motorcycle to the Police?

Is it normal for the idle speed to always be at 1000 RPM?

Are Chassis Armor and Chassis Rustproofing the Same?