How to Check the Results After Completing Subject 2?

Is It Safe to Drive a Flood-Damaged Vehicle Later?

Driving a flood-damaged vehicle later is not safe. When a car has been submerged in water, water and mud can easily enter through the gaps between metal panels and in the sandwich layers, leading to metal corrosion over time. The entire electrical system is prone to short circuits, and various electronic modules are likely to malfunction. Components such as the engine are also susceptible to damage. These issues can occur unpredictably at any time. Below are the impacts of a car being submerged in water: 1. Mold: Cars have numerous channels and holes, making it very difficult to clean out all the water after submersion. Over time, this leads to mold and rust. Soft interior decorations soaked in dirty water can leave stubborn stains, and any remaining dirty water will continue to cause mold growth. 2. Deterioration: Lubricants in components like the four-wheel bearings and half-shafts can quickly deteriorate when soaked in water. 3. Engine water ingress: Never attempt to restart the engine. This prevents water from entering the cylinders and causing severe engine damage. If your car has been submerged in water, the owner should immediately notify the insurance company to file a claim.

18

3

Share

Why Can't I See Clearly When the Oncoming Car's Headlights Are Too Bright?

Oncoming car headlights appearing too bright and impairing vision is due to the intense light stimulating the eyes, causing temporary blindness. Tips for using headlights during night driving: First, ensure the headlight beam position is properly adjusted. While driving, you may use high beams, but switch to low beams within 100 meters before encountering another vehicle, then resume high beams afterward. When driving at night, pay more attention to the lane markings ahead to make driving easier. Most drivers will switch to low beams when meeting another vehicle to avoid excessive glare. Rainy conditions are more challenging; following the vehicle ahead with low beams on makes driving easier, but maintain an appropriate following distance. Comparison of brightness among different headlights: Among automotive headlights, laser headlights are the brightest, with xenon and LED lights being moderately bright, and halogen lights being the dimmest. However, in practice, the brightness of xenon and LED lights can vary by up to 300 lumens due to differences in manufacturers and production processes, so their brightness isn't absolute. Nonetheless, it's clear that laser headlights are the brightest and halogen lights are the dimmest.

12

2

Share

Is Unstable Idle Related to Engine Oil?

Unstable idle is not related to engine oil. The reasons for unstable idle are as follows: Spark Plug Malfunction: Weak sparks caused by individual spark plug malfunctions can also lead to carbon buildup on spark plugs. Carbon deposits can be cleaned to restore spark plug activity, but some spark plugs may experience performance degradation as they approach the end of their service life. Fuel Line Blockage: Blockages in the fuel line, represented by the fuel injector, or intake manifold malfunctions can result in insufficient fuel supply pressure. This leads to poor fuel atomization, causing an imbalance in the air-fuel mixture and incomplete combustion, which in turn results in related malfunction symptoms. Sensor Malfunction: Malfunctions in related sensors can prevent the ECU from accurately controlling the air-fuel ratio. Common examples include coolant temperature sensor, oxygen sensor, and throttle position sensor malfunctions. The coolant temperature sensor is typically installed on the engine block or cylinder head water jacket, directly contacting the antifreeze to measure temperature and provide relevant reference data to the ECU.

17

2

Share

What Causes a Sudden Increase in Car Fuel Consumption During Summer?

During summer, high tire pressure and frequent use of windows and air conditioning can lead to increased fuel consumption. Below is relevant information about fuel consumption: 1. Fuel consumption per 100 kilometers: This refers to the amount of fuel a vehicle consumes when driving a hundred kilometers at a certain speed on the road. It is a theoretical indicator of the vehicle. Manufacturers measure this value in an objective environment using a dynamometer installed on the vehicle's chassis, converting it into speed parameters. They then calculate the theoretical experimental fuel consumption per 100 kilometers for the model by driving at specified speeds. 2. Road condition fuel consumption: This is a fuel indicator calculated based on repeated tests of a vehicle driving on specified roads at prescribed speeds and times, also known as multi-condition road cycle fuel consumption. The standard specifies that each cycle includes various driving conditions, recording parameters such as gear shift timing, parking time, driving speed, acceleration, braking, and deceleration for each cycle. The values obtained from this method are closer to actual conditions.

1

0

Share

Will the lack of antifreeze in a car affect the engine?

Yes, the lack of antifreeze in a car will affect the engine. Without antifreeze, the engine's heat dissipation will be poor, leading to inadequate cooling during operation and potentially causing engine damage. Antifreeze is a coolant containing special additives, primarily used in liquid-cooled engine cooling systems. It offers excellent properties such as preventing freezing in winter, boiling in summer, and protecting against scale and corrosion throughout the year. It is essential to use antifreeze from the same brand. Different brands may have varying production formulas, and mixing them could result in chemical reactions between additives, rendering them ineffective. For vehicles that operate for extended periods, such as taxis, high-quality antifreeze should generally be replaced annually. For vehicles with shorter operating times, replacement every two years or every 30,000 kilometers is sufficient. To prevent excessive foam formation, which can reduce the heat exchange efficiency between the antifreeze and engine components, ensure the product is within its validity period when adding it. Long-lasting antifreeze can remain effective for up to three years. If suspended particles, sediments, or signs of deterioration or discoloration are observed in the antifreeze, it should be replaced promptly, and the system should be cleaned.

19

1

Share

What is the displacement of the A8-45TFSI?

Audi A8L's 45TFSI model is equipped with a 3.0-liter engine, specifically a 3.0T supercharged engine. Relevant details are as follows: 1. 45TFSI is a model designation for Audi in the Chinese market: The displacement labeling has been adjusted, changing from the previous naming convention based on displacement (e.g., 1.8T, 2.0T, 2.4T) to a numerical naming system derived from the G-value calculated from the vehicle's 0-100 km/h acceleration. 2. The '45' in 45TFSI represents the vehicle's acceleration magnitude: Several Audi models feature the 45TFSI designation, including the A8L, A4L, TT, and A5. These models have different engine displacements; for example, the A8L-45TFSI is equipped with a 3.0T engine, while the A5-45TFSI has a 2.0T engine. This is because the two vehicles have different weights, allowing the Audi A5 with a 2.0T engine to achieve the same acceleration performance as the A8L with a 3.0T engine.

2

0

Share

How to Check the Results After Completing Subject 2?

Is It Safe to Drive a Flood-Damaged Vehicle Later?

Why Can't I See Clearly When the Oncoming Car's Headlights Are Too Bright?

Is Unstable Idle Related to Engine Oil?

What Causes a Sudden Increase in Car Fuel Consumption During Summer?

Will the lack of antifreeze in a car affect the engine?

What is the displacement of the A8-45TFSI?

Can Motorcycle Seats Be Modified?

How Many Years Is a Newly Purchased Vehicle Exempt from Inspection?

Can a Manual Transmission Vehicle Start Directly by Pressing the Accelerator?

How to Fold the Rearview Mirror of Buick Envision?