How Long Does the Driving License Subject One Test Take?

Is It Normal to See Black Smoke When Accelerating Hard?

This is not a normal phenomenon. If black smoke appears when the engine is cold, check for any damage or air leaks in the air intake system, then inspect the fuel injectors for dripping and ensure the seals are intact. If black smoke persists after the engine warms up, examine the fuel injection volume, injection pressure, and the data or waveform from the front oxygen sensor to determine if its correction function is working properly. Also, check the condition of the catalytic converter and the coolant sensor. Methods to address black smoke when accelerating hard: 1. Overly rich air-fuel mixture: Inspect whether the oxygen sensor has failed. If the oxygen sensor fails, the vehicle loses its ability to automatically adjust the fuel injection volume, making black smoke more likely when accelerating hard. 2. Excessive fuel impurities: If low-quality fuel is used, it can produce many impurities after combustion. 3. Degraded or failed spark plugs: Spark plugs are responsible for igniting the air-fuel mixture. If they are worn out, they may fail to effectively ignite the gasoline, leading to incomplete combustion. In such cases, replacing the spark plugs is the only solution.

4

Share

What are the license plate registration requirements for new energy vehicles in Shenzhen?

Shenzhen new energy vehicle license plate registration requirements: 1. Local residents only need a driver's license, while non-Shenzhen residents require a residence permit + uninterrupted Shenzhen social security for 2 consecutive years + driver's license. 2. The applicant must not have a Guangdong B license plate car in their name or any vehicle that should be scrapped but has not completed the deregistration process. 3. The applicant must not have a valid quota or be eligible to apply for a renewal quota, meaning the individual must not have any Shenzhen-licensed cars in their name. Relevant information about license plates: 1. Introduction: License plates, commonly known as vehicle plates, refer to the plates hung on the front and rear of vehicles, displaying the vehicle's registration number, registration region, or other relevant information. 2. Function: License plates serve as identification and information registration for vehicles, primarily allowing identification of the vehicle's region of registration and enabling the tracing of the vehicle's owner and registration details through the plate number.

7

3

Share

Should you use the left turn signal when making a right U-turn?

When making a right U-turn, you should not use the left turn signal; instead, use the right turn signal. When performing a U-turn, always signal in the direction of the turn. It's important to signal in advance—slowing down and signaling only when reaching the intersection can cause sudden disruptions for vehicles behind you. If the following driver isn't paying full attention, it could lead to an accident. Precautions for U-turns: When making a U-turn, you should activate the left turn signal in advance. The maximum speed should not exceed 30 km/h, and you must not obstruct other vehicles or pedestrians moving normally. Scenarios where U-turns are prohibited: 1. No U-turn or No Left Turn signs: If there is a "No U-turn" or "No Left Turn" sign, U-turns are not allowed at that intersection. Since a U-turn is an extension of a left turn, intersections with "No Left Turn" signs also prohibit U-turns. 2. Pedestrian crossings (zebra crossings): U-turns are prohibited on zebra crossings. If a U-turn is permitted at an intersection, you must cross the zebra crossing completely before turning, not on it. 3. No dedicated left-turn lane: Even if you're in the leftmost lane, U-turns are not allowed unless there's a sign permitting left turns. 4. Second left-turn lane: If your vehicle is in the second left-turn lane, U-turns are prohibited. Without any signage, U-turns are only allowed from the innermost left-turn lane. 5. Solid yellow lines: U-turns are prohibited at solid yellow lines. Even if U-turns are permitted, you must wait for a green light and cross the stop line before turning. 6. Highways: Making a U-turn by crossing the central divider on a highway is illegal and punishable by fines and 12 penalty points. If you miss an exit, continue to the next one instead of attempting an illegal U-turn.

6

0

Share

What is the usage method of automotive brake fluid?

For different types of brake fluid, they should not be mixed together, as this will reduce the braking effectiveness of the vehicle; do not mix gasoline, diesel, or engine oil into the brake fluid. Below is relevant information about brake fluid: 1. Properties: Automotive brake fluid is the liquid used in hydraulic braking systems. It must not undergo chemical reactions, be unaffected by high temperatures, and not cause corrosion, softening, or swelling to metals and rubber. The commonly used types are DOT3, DOT4, and DOT5. 2. Regular replacement: The volume of brake fluid changes with temperature variations, hence the brake fluid reservoir is equipped with a vent hole. The air drawn in through this hole may contain moisture or impurities, which can be absorbed or dissolved by the brake fluid, thereby lowering the boiling point of the moisture-containing brake fluid. When a vehicle brakes during prolonged driving, the temperature of the braking system rises, making the brake lines prone to vapor lock, where air is compressed, potentially leading to reduced braking force or brake failure. Therefore, for driving safety, brake fluid must be replaced regularly.

7

0

Share

What is the general pressure for car air conditioning?

Car air conditioning should normally have a high-pressure reading between 1.3 to 1.7MPa, and a low-pressure reading between 0.15 to 0.25MPa. The car air conditioning system is a device designed to cool, heat, ventilate, and purify the air inside the vehicle compartment. It provides a comfortable environment for passengers, reduces driver fatigue, and enhances driving safety. The presence of an air conditioning system has become one of the indicators of a car's comprehensive functionality. During summer, when there is a significant temperature difference between the inside and outside of the car, it is advisable not to immediately set the air conditioning to a very low temperature upon entering the vehicle. Instead, first use high airflow with natural ventilation to dissipate the hot air inside the compartment. Then, avoid closing all windows immediately; turn on the air conditioning and allow your body to gradually adjust before setting the air conditioning to the desired temperature and closing the windows. This approach prevents discomfort caused by a sudden drop in external temperature.

1

2

Share

What is the tire pressure for a 4.2-meter truck?

The recommended tire pressure for this type of truck is around 800 kPa. Tires are the only part of the vehicle that comes into contact with the ground, and they are crucial for driving stability and safety. Therefore, it is essential to pay attention to your vehicle's tires during daily use. Below is some relevant information about tires: 1. Pressure: Tire pressure is extremely important. It should neither be too high nor too low. If the pressure is too low, the tires may exhibit wave-like deformation during high-speed driving, which can shorten their lifespan and increase the risk of a blowout. If the pressure is too high, it reduces the contact area between the tire and the ground, leading to poorer traction. Poor traction can negatively affect the vehicle's handling and driving stability. 2. Regular Replacement: Tires are made of rubber, which can deteriorate over time. Therefore, tires need to be replaced periodically. Under normal conditions, tires installed on a vehicle can last for about four years, so it is recommended to replace them every four years. After installing new tires, it is crucial to perform a dynamic balance test on each wheel to prevent abnormal vibrations.

3

5

Share

How Long Does the Driving License Subject One Test Take?

Is It Normal to See Black Smoke When Accelerating Hard?

What are the license plate registration requirements for new energy vehicles in Shenzhen?

Should you use the left turn signal when making a right U-turn?

What is the usage method of automotive brake fluid?

What is the general pressure for car air conditioning?

What is the tire pressure for a 4.2-meter truck?

What does Subject 3 test include?

What Are the Common Issues After Cleaning Fuel Injectors?

What is the sign for a high-occupancy vehicle lane?

How Many Kilometers Can You Drive After the Fuel Tank is Empty?