What does it mean when a car has resonance?

What Causes Knocking Sounds When Accelerating the Engine?

Knocking sounds when accelerating the engine may be caused by carbon buildup in the starter motor's internal carbon brushes. Cleaning the carbon deposits should resolve the issue. Introduction to Carbon Brushes: Carbon brushes, also known as electric brushes, are sliding contact devices widely used in many electrical equipment. The materials used in carbon brushes mainly include graphite, impregnated graphite, and metal (containing copper or silver) graphite. How Carbon Brushes Work: Carbon brushes are components that transfer energy or signals between the stationary and rotating parts of motors, generators, or other rotating machinery. They are typically made of pure carbon with a binder, shaped into blocks that fit into metal holders. A spring inside presses the brush against the rotating shaft. When the motor operates, the brush delivers electrical energy to the coils via the commutator. Since the primary component is carbon, it is called a carbon brush. These brushes are prone to wear and require regular maintenance, replacement, and carbon deposit cleaning.

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Why is the voltage of a new car battery low?

Reasons for low voltage in a new car battery: The car has been parked for a long time, causing the battery to lose power, or the battery has reached the end of its service life. The following details the reasons: Car parked for a long time: When the car is in a parked state, the battery will still discharge due to its self-discharge characteristics, even if the battery is not in use. Additionally, most modern cars are equipped with anti-theft systems, which continue to operate while the vehicle is parked and require a certain amount of power supply. Battery reaching the end of its service life: Currently, most private cars use maintenance-free batteries. Wipe the inspection eye on the battery clean and observe the color inside. If it is green, it indicates the battery is normal; if it is black, it means the battery voltage is low and insufficiently charged, which can be resolved by charging; if it is white, it indicates the battery has reached the end of its service life, and the only solution is to replace the battery.

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Should I Purchase New Car Insurance from a 4S Shop or on My Own?

New car insurance is purchased from a 4S shop. Costs of purchasing a car at a 4S shop: Car price, whether financing is involved, purchase tax, vehicle and vessel tax, compulsory traffic insurance, etc. Differences between buying car insurance at a 4S shop and directly from an insurance company: Theoretically, there is no difference. The terms of insurance companies are uniform. The invoice prices are the same. After-sales claim services are uniformly handled by the insurance company. It makes no difference through which intermediary the insurance is processed, and the insurance company does not treat customers differently. In fact, insurance comes with rebates. Claims that car insurance has no rebates and cannot benefit customers are simply self-deception. The so-called prohibition of insurance companies giving rebates has only been implemented in the documents of the insurance regulatory authority. Where to buy cheaper depends on the car model and the region. 4S shops have cooperative relationships with insurance companies, which is called premium-for-repair.

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Can I obtain a D license without upgrading from a C1 license?

You cannot obtain a D license without upgrading from a C1 license. Upgrading from C1 to D license: Time restriction: As long as one year has passed since the initial application for the C1 license, you can apply for a motorcycle D license. In other words, if the probationary period of the C1 license has ended, you can upgrade to a D license. Demerit point restriction: According to relevant regulations, if you already hold a motor vehicle driver's license and want to add another vehicle class, you must not have accumulated 12 or more demerit points in the previous scoring cycle. If you have accumulated 12 or more points, you cannot upgrade to another vehicle class. Therefore, if your C1 license did not accumulate 12 or more demerit points in the previous scoring cycle, you can upgrade to a motorcycle D license. Application process: Bring your driver's license issued in your registered residence, ID card, medical examination certificate (some are provided by the driving school or vehicle management office), 4-8 one-inch white-background color ID photos, and fill out the "Motor Vehicle Driver's License Application Form".

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Can You Drive After Drinking a Glass of Foreign Liquor?

You cannot drive after drinking a glass of foreign liquor. Penalty standards for drunk driving: Blood alcohol content between 20mg/100ml and 80mg/100ml is considered drunk driving; blood alcohol content at or above 80mg/100ml is considered intoxicated driving. Drunk driving: Driving under the influence of alcohol in a non-commercial vehicle results in a fine, 12 demerit points, and a 6-month license suspension; driving under the influence in a commercial vehicle results in a fine, 12 demerit points, up to 15 days of detention, and a 5-year ban on obtaining a driver's license. Intoxicated driving: Driving while intoxicated in a non-commercial vehicle leads to license revocation, a 5-year ban on obtaining a new license, possible detention, and fines; driving while intoxicated in a commercial vehicle leads to license revocation, a 10-year ban on obtaining a new license, a lifetime ban on driving commercial vehicles, possible detention, and fines.

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What is the recommended speed for a new car on the road?

New cars should be driven below 100 km/h on the road. Reasons for driving a new car at low speeds: A new car should not exceed 100 km/h, especially if the driver obtained their license last year and has little experience on the road, let alone long-distance driving. According to the regulations on the application and use of motor vehicle driving licenses, the first 12 months after a driver initially obtains a motor vehicle driving license is considered the probationary period. Precautions during the break-in period of a new car: Avoid emergency braking as much as possible. Emergency braking not only impacts the braking system during the break-in period but also increases the load on the chassis and engine. It is best to avoid emergency braking within the first 300 kilometers of driving. Do not overload the car. Running a new car at full capacity during the break-in period can damage the components. Therefore, within the first 1,000 kilometers, the load should generally not exceed 75%-80% of the rated capacity. When driving on highways during the break-in period, the engine will operate continuously for longer periods, which can lead to increased wear. It is recommended to maintain a speed of 120 km/h with the engine speed not exceeding 3,000 RPM. If the engine speed exceeds 3,000 RPM, consider reducing the speed to keep it within this limit. During long-distance drives, take breaks at service areas for about ten minutes. Avoid changing the oil too early. The initial oil in a new car is specifically designed for the break-in period, with low viscosity, excellent heat dissipation, cleaning, and oxidation resistance properties. Some manufacturers even add grinding agents to aid the break-in process. Therefore, the oil should only be changed according to the manufacturer's recommended schedule, not prematurely.

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What does it mean when a car has resonance?

What Causes Knocking Sounds When Accelerating the Engine?

Why is the voltage of a new car battery low?

Should I Purchase New Car Insurance from a 4S Shop or on My Own?

Can I obtain a D license without upgrading from a C1 license?

Can You Drive After Drinking a Glass of Foreign Liquor?

What is the recommended speed for a new car on the road?

What are the content and passing criteria for the Motorcycle Subject 3 test?

What Could Be the Problem If the Tower Crane Trolley Doesn't Move?

What is the Mofan EC3?

How Many Spark Plugs Does a Four-Cylinder Engine Have?