How to Repair Scratches on Car Headlights?

How many points are deducted for stalling during hill start in Subject 2?

Stalling during hill start in Subject 2 results in a deduction of 10 points. The following are the test techniques for hill start in Subject 2: 1. Upon hearing the instruction: Immediately turn on the right turn signal and steer the vehicle towards the right side of the course; If there is a slope when starting, use the hill start method to prevent rolling back. 2. When approaching the roadside: Turn the steering wheel slightly to the left, then quickly straighten it to the right, ensuring the right side of the vehicle remains parallel to the roadside and within 30CM. Keep the black square of the left wiper's middle connecting part between the white and yellow lines, avoiding the yellow line; It's best to follow the white dashed line or align the left rib with the marker line; After starting, you can fully release the clutch and proceed uphill. 3. When nearing the stopping point: Press the clutch to slow down. Upon seeing the stopping marker to the right, press the foot brake and clutch to stop, or stop when the edge of the positioning pole line is visible from the lower edge of the left rearview mirror. Then, pull the handbrake, turn off the turn signal, shift to neutral, and release the clutch.

12

0

Share

Which Gear Should an Automatic Transmission Car Be in When Warming Up?

When warming up an automatic transmission car, it should be in P (Park) gear to lock the tires. If the car is in N (Neutral) gear on uneven ground, it might roll even with the handbrake engaged. Additionally, the transmission fluid level is lower in N gear during warm-up, which can be harmful to the gears. The P gear is a common position in automatic transmission vehicles, usually located at the front of the gear shift console, before the R (Reverse) gear. Its purpose is to lock the axle when the car is stationary on a slope. Here is an introduction to the gears in an automatic transmission car: 1. R is the Reverse gear, which can only be engaged when the vehicle is completely stopped. 2. N is the Neutral gear, used for temporary parking. 3. S is the Sport mode, where the main difference from D (Drive) gear is that the computer switches to a different shifting program. S mode can be engaged at any time. 4. D is the Drive gear, where gear shifts are controlled simply by the accelerator pedal.

8

0

Share

How many kilometers of free towing service is included in highway insurance?

Insurance companies generally offer free towing services ranging from 50 to 100 kilometers, though the distance may vary depending on the coverage amount. Whenever a car encounters a problem requiring repair and cannot continue normal operation, towing services can be called to resolve the issue. Below are some towing precautions: 1. Choose the appropriate towing hook: The towing hook must not only be able to latch on but also securely fasten. Ensure the installation is correct and repeatedly check that the hook is properly engaged before towing. If the hook disengages mid-tow, it can cause damage to the vehicle, increasing maintenance costs. 2. Prefer a towing bar: If the towed vehicle has braking issues or is being towed on icy roads, it is best to use a towing bar. A rigid towing bar prevents situations where excessive pulling by the towing vehicle or sudden braking could cause the towed vehicle to lose control and collide with the towing vehicle, making the process safer. 3. Control speed and maintain distance: During towing, pay attention to speed and the distance between the two vehicles. Since one vehicle is malfunctioning, improper distance management can easily lead to accidents. Avoid driving at normal speeds; instead, maintain a speed of around 20 km/h and never exceed 30 km/h.

19

1

Share

What are the differences between direct injection and multi-point injection?

The main difference between direct injection and multi-point injection lies in the fuel injection method. The following are the distinctions between direct injection and multi-point injection: 1. Fuel injection method: Electronic fuel injection can be divided into ordinary electronic injection, single-point injection, and multi-point injection. Essentially, the forms of injection are quite similar—all involve spraying fuel into the intake manifold where it mixes with air before entering the cylinder for combustion. However, the control precision has become increasingly refined. Direct injection delivers fuel directly into the cylinder, where it then mixes with air from the intake manifold before combustion occurs. 2. Their respective advantages: Multi-point injection has a relatively simpler structure, more mature technology, and does not require as high a fuel injection pressure as direct injection. Therefore, the demands on electronic fuel injectors are lower, and the cost is relatively cheaper. In terms of reliability and post-maintenance, it is clearly more economical. Additionally, multi-point injection engines are less demanding on fuel quality. The greatest advantage of direct injection is that fuel is injected directly into the combustion chamber at extremely high pressure. With significant advancements in electronic control systems in recent years, the computer's ability to interpret and control air intake and fuel injection timing has become more precise, enabling stratified combustion and lean combustion. As a result, it offers superior performance in fuel efficiency and power compared to multi-point injection technology. 3. Their respective disadvantages: Multi-point injection engines can form a mixture in the intake manifold, making the intake tract more prone to carbon deposits. However, since multi-point injection sprays fuel into the intake manifold and gasoline itself is an excellent carbon deposit cleaner, it can effectively clean components such as the intake valves, cylinders, fuel injectors, and intake manifold. Therefore, it tends to have fewer carbon deposit issues compared to direct injection. On the other hand, direct injection engines inject fuel directly into the cylinder, making the cylinder more susceptible to carbon deposits (the throttle of direct injection engines is prone to carbon buildup). However, the intake manifold area of direct injection technology lacks a significant amount of gasoline to clean carbon deposits, leading to the accumulation of more carbon over time, which can obstruct airflow. This, in turn, can increase vehicle fuel consumption and reduce power output.

2

Share

Where is the Car Air Filter Located?

The location of a car's air filter depends on the intake system and engine structure. Generally, it is located in the air cleaner on the engine's intake pipe. There are two types of air filters in cars: dry and wet. Dry filters are made of paper or organic materials, while wet filters are made of metal mesh. Air filters should be replaced every 10,000 to 20,000 kilometers or during each maintenance interval. However, it is recommended to clean the air filter every 5,000 kilometers to reduce the buildup of throttle sludge. Function of the air filter: It filters out particulate impurities from the air, ensuring that a sufficient amount of clean air enters the cylinders. This prevents airborne dust from being sucked into the engine, which could accelerate wear on the piston assembly and cylinders. Air filter: It is a type of filter, also known as an air cartridge, air cleaner, or air element. It is mainly used in engineering vehicles, automobiles, agricultural vehicles, laboratories, sterile operating rooms, and various precision operating rooms as an air filtration device. During operation, the engine draws in a large amount of air. If the air is not filtered, airborne dust can enter the cylinders, accelerating wear on the piston assembly and cylinders. Larger particles entering between the piston and cylinder can cause severe cylinder scoring, especially in dry and sandy working environments. The air cleaner is installed in front of the carburetor or intake pipe to filter out dust and sand from the air, ensuring that sufficient, clean air enters the cylinders. Dirty air cleaner: Using a dirty air cleaner while driving can restrict airflow into the engine, leading to incomplete fuel combustion. This can cause unstable engine operation, reduced power, and increased fuel consumption. Therefore, it is essential to keep the air cleaner clean. The car air cleaner is a device that removes particulate impurities from the air. It consists of one or several air filter components. Its main function is to filter out harmful impurities from the air before it enters the cylinders, thereby reducing early wear on the cylinders, pistons, piston rings, valves, and valve seats. Thus, air must pass through the fine filtration of the air cleaner before entering the cylinders. Notes about air filters: An air cleaner that has been in use for some time is more efficient than a new one. This is because the impurities already trapped by the filter help it capture more fine dust. A visibly dirty air filter does not necessarily mean it is no longer functioning properly. The vehicle's operating time or mileage serves only as a reference. Whether to replace the filter depends on actual conditions, such as whether it can no longer allow sufficient airflow. The air cleaner must ensure that it filters out impurities while allowing enough air to enter the engine.

16

4

Share

What Causes Lithium Battery Explosions?

Lithium battery explosions can occur due to long-term overcharging of cells, battery short circuits, charging-induced explosions, mismatched chargers and batteries, excessive temperatures, and thermal runaway. Below are detailed explanations: Long-term overcharging of cells: Prolonged charging can lead to overcharging and overcurrent, resulting in high temperature and pressure, which pose risks. Under special temperature, humidity, or poor contact conditions, lithium batteries may discharge instantaneously, generating a large current and causing spontaneous combustion or explosions. Battery short circuits: When a phone is in a high-temperature state or subjected to impacts or metal friction, it may cause a battery short circuit, leading to an explosion. Charging-induced battery explosions: Using a phone while charging prolongs the charging time, which can raise the phone's temperature and increase the likelihood of an explosion. Mismatched chargers and batteries: Most phones come with original chargers. Using an incompatible charger can easily lead to battery accidents. For example, iPhones only accept original chargers, significantly reducing the likelihood of battery explosions. Excessive temperatures: This refers to the internal heat of the battery reaching its limit. Prolonged charging, exposure to high temperatures, or baking can easily cause the battery to overheat. Thermal runaway: The danger of lithium-ion battery explosions stems from a process called "thermal runaway" in the internal reactions of the battery. Thermal runaway is a positive feedback energy cycle where rising temperatures cause the system to heat up, which in turn raises the temperature further, making the system even hotter.

19

4

Share

How to Repair Scratches on Car Headlights?

How many points are deducted for stalling during hill start in Subject 2?

Which Gear Should an Automatic Transmission Car Be in When Warming Up?

How many kilometers of free towing service is included in highway insurance?

What are the differences between direct injection and multi-point injection?

Where is the Car Air Filter Located?

What Causes Lithium Battery Explosions?

What is the purpose of a bumper?

Is it advisable to purchase a car that has been in stock for 2 years?

What to Do When Your Car Is Leaking Oil?

How Often Should a Car Battery Be Replaced?