Why does a small wrench appear on the car?

What Causes Backfiring in a Car's Exhaust Pipe?

Backfiring in a car's exhaust pipe can occur due to the following reasons: 1. Overly rich or lean air-fuel mixture: When the engine's combustible mixture is too rich, incomplete combustion occurs, and unburned mixture enters the exhaust pipe. Upon encountering fresh air in the exhaust system, it reignites, causing an explosion sound. Conversely, if the mixture is too lean, the spark energy may be insufficient to ignite it, leading to combustion in the exhaust pipe and resulting in backfiring. 2. Excessive fuel level in the float chamber: This creates an overly rich mixture and allows some fuel to enter the cylinder without proper atomization. The unburned fuel then travels to the muffler, where it reignites, causing backfiring. 3. Excessive ignition advance angle or excessive valve overlap: Incorrect gear installation can cause the exhaust valve to open prematurely, leading to backfiring. 4. Weak or interrupted spark: If the combustible mixture fails to ignite during a stroke, it may be ignited by high-temperature gases from the next stroke after entering the muffler. 5. Excessive fuel during startup: Multiple starting attempts can create an overly rich mixture, accumulating fuel in the cylinder and causing oil droplets to exit the muffler. When the engine starts, the fuel in the muffler ignites, resulting in backfiring. 6. Faulty ignition coil: A damp or leaking ignition coil can cause unstable or interrupted sparking, leading to backfiring, even if the CDI, high-voltage coil, and spark plug are functioning properly.

5

2

Share

How to Use a Column Shifter?

When shifting gears, press the brake pedal and then move the gear lever, just like with a regular automatic transmission car. After starting, the gear is in neutral (N). Pushing the lever upward engages reverse (R), while pushing it downward engages drive (D). When parking, press the brake, shift to neutral (N), then press the external button to engage park (P). Below is relevant information about column shifters: 1. One button on the column shifter is for park (P). Gently pushing the lever forward or backward engages neutral (N), pushing it firmly forward engages reverse (R), and pushing it firmly backward engages drive (D). The parking brake is replaced by the park (P) position. Remember to press the brake when shifting. 2. The term "column shifter" comes from the motion of pulling the gear lever toward the driver's chest when shifting. There are two types of gear lever arrangements in cars: floor-mounted and column-mounted. A gear lever located below the right side of the steering wheel is called a column shifter, which is more common in American cars. 3. Column shifters are generally automatic. Currently, common American cars with column shifters in the Chinese market include the Buick GL8 and older Regal models. German brands like Mercedes-Benz also frequently use column shifters, such as in the C, E, R, S, ML, and GL series. British brand Rolls-Royce's three current models (Phantom, Ghost, Wraith) also feature column shifters.

7

0

Share

Will there be any consequences if I accidentally used someone else's ETC when exiting the highway?

Those who exploit others' ETC will face penalties. Vehicles that illegally use another's ETC cannot evade surveillance. Once confirmed through license plate verification that a vehicle has engaged in ETC exploitation, it will be blacklisted. This will affect future highway access, potentially even leading to denied entry. Since there's no entry record at the toll station, the exit will be processed as a no-card situation, charging the maximum distance fee for the entire route. ETC Usage Precautions: The ETC transaction sensing range is 8 meters. When encountering a stationary vehicle ahead, maintain a distance of over 10 meters to prevent automatic fee deduction for the preceding vehicle, especially if its ETC device is faulty or absent. The ETC lane recognition speed limit is 20km/h. Exceeding this speed may prevent successful reading of vehicle device information, resulting in failed deductions. Unauthorized removal or movement of OBU devices, or detachment/loosening of ETC electronic tags will deactivate the tags. These can be inspected at the bank where the ETC card was issued or at highway service centers. Non-deliberate detachment only requires reactivation. When using debit cards linked to ETC, insufficient balance may cause deduction failures. Follow on-site staff guidance to use manual MTC lanes with cash or card payments. Excessively thick windshields may cause poor signal reception, particularly for vehicles with replaced windshields after accidents or modified front windshields.

16

2

Share

What type of license plate should hybrid vehicles use?

Hybrid vehicles are divided into two types: range-extended hybrids and plug-in hybrids. Range-extended hybrid models should use blue license plates, while plug-in hybrids should use green license plates. Below is the classification of license plates: 1. Large vehicle license plates: Yellow background with black characters and black borders. For medium-sized (and above) passenger vehicles, cargo vehicles, and special-purpose vehicles. 2. Trailer license plates: Yellow background with black characters and black borders. For full trailers and semi-trailers not permanently attached to the tractor. 3. Small vehicle license plates: Blue background with white characters and white borders. 4. Diplomatic and consular vehicle license plates: Black background with white characters, red "Embassy" or "Consulate" characters, and white borders. 5. Hong Kong and Macau entry-exit vehicle license plates: Black background with white characters, white "HK" or "MO" characters, and white borders. 6. Training vehicle license plates: Yellow background with black characters and a black "T" character. Black borders. For training vehicles. 7. Police vehicle license plates: White background with black characters and a red "Police" character. Black borders. For police cars. 8. Low-speed vehicle license plates: Yellow background with black characters and black borders. 9. New energy vehicle license plates: New energy vehicle license plates are divided into small and large new energy vehicle license plates. The dimensions of new energy vehicle license plates are 480mm × 140mm. Small new energy vehicle license plates feature a gradient green color, while large new energy vehicle license plates have a yellow-green dual-color scheme. Plates starting with "D" are for pure electric vehicles, while those starting with "F" are for non-pure electric vehicles (including plug-in hybrids and fuel cell vehicles).

4

3

Share

How Long is the Interval Between Subject 1 and Subject 2?

According to the "Regulations on the Application and Use of Motor Vehicle Driving Licenses," the time between Subject 1 and Subject 2 varies depending on the type of license. For a Class C license, you can schedule Subject 2 10 days after passing Subject 1, while for Class A and B licenses, you must wait 20 days. This provides ample time to prepare for Subject 2. Each Subject 2 exam appointment comes with two attempts. If you fail the first attempt, you can retake it once for free. If you skip the retake or fail it again, the exam ends. Within the validity period of your driving permit, you can schedule Subject 2 no more than five times. If you fail the fifth attempt, all previously passed subjects will be invalidated. To continue learning, you must restart from Subject 1. For example, the Class C1 Subject 2 exam includes: Completing driving tasks within a designated area; demonstrating mastery of driving skills; and assessing spatial judgment. Subject 2, also known as the "small road test," consists of five mandatory items: reverse parking, parallel parking, hill start, right-angle turns, and curve driving. Some regions include a sixth item: highway toll card collection. Subject 2 Exam Tips: After entering the car, adjust the seat and mirrors to a comfortable position and fasten your seatbelt. For parallel parking, find the right angle and turn the steering wheel quickly while coordinating with the car's speed. During hill starts, remember to engage the handbrake, signal left, and release the handbrake. Maintain clutch control while gently pressing the accelerator to avoid stalling or rolling back. For right-angle turns, react swiftly after identifying the turning point while matching the car's speed to prevent misalignment. For curve driving (S-turns), slow down. Those with good driving instincts may pass smoothly in one go. During reverse parking, control your speed, use reference points, and adjust based on mirror observations. The driving test consists of three subjects: Subject 1 (traffic laws and regulations), Subject 2 (field driving skills), and Subject 3 (road driving skills and safety knowledge). The safety knowledge test, often called "Subject 4," follows Subject 3, though it is not officially recognized in regulations (e.g., Ministry of Public Security Order No. 123).

19

2

Share

What Documents Are Needed for the Subject One Exam?

For the exam, you only need to bring your ID card. The admission ticket and other documents are handled by the driving school, which will distribute them during the exam. Electronic IDs are not accepted for the exam. If you don't have an ID card, you can apply for a temporary one, which holds the same validity as a regular ID card. The "Regulations on the Application and Use of Motor Vehicle Driver's Licenses" clearly state that the Subject One exam can be taken twice on the same day. If you fail the first attempt, you can retake it for free. If you fail the second attempt, the Subject One exam is terminated, and you can only reschedule after ten days. The Subject One exam consists of 100 questions, divided into single-choice and true/false questions, each worth 1 point, totaling 100 points. If you answer 11 questions incorrectly during the exam, the system will automatically submit the test and end the exam. The Subject One exam is computer-based and lasts 45 minutes. Subject One Exam Content: Driver's license and motor vehicle management regulations; road traffic conditions and regulations; road traffic safety violations and penalties; road traffic accident handling regulations; basic knowledge of motor vehicles; local regulations; knowledge of braking systems and safety devices for large and medium-sized passenger and freight vehicles; specialized knowledge for wheeled self-propelled machinery, trams, and trolleybuses. Subject One Exam Notes: During the exam, students should pay attention to their attire—no slippers are allowed. Electronic devices and bags are not permitted in the exam room. Bring your ID card and queue to enter the waiting hall. Observe the instructions and procedures on the large screen, and store personal items in lockers before entering the exam room. Upon entering the exam room, the identity verification desk will assign a seat. After finding your seat, begin the exam. Ensure the camera is aligned with you and follow exam discipline. If you fail the first attempt, you can retake it the same day. If you fail again, you must pay to reschedule. After the exam, queue to collect your score report and sign it. Failure to sign renders the result invalid. There is no limit to the number of times you can reschedule the Subject One exam. Each subject can be taken once, with one retake allowed if you fail. If you skip the retake or fail it, the exam is terminated, and you must reschedule. For Subject Two and Subject Three, there are only five exam attempts. Subject Two and Subject Three exams can be rescheduled after ten days. If you fail the Subject Three safe driving knowledge test, your previously passed road driving skills test results remain valid. There are three subjects in the driving test: Subject One, Subject Two, and Subject Three. Subject One refers to the exam on road traffic safety laws, regulations, and related knowledge. Subject Two refers to the field driving skills exam. Subject Three is divided into two parts: road driving skills and safe driving knowledge. The safe driving knowledge test is conducted after Subject Three, so it is commonly referred to as Subject Four. However, the official term (as per the Ministry of Public Security's Order No. 123) does not include "Subject Four."

14

5

Share

Why does a small wrench appear on the car?

What Causes Backfiring in a Car's Exhaust Pipe?

How to Use a Column Shifter?

Will there be any consequences if I accidentally used someone else's ETC when exiting the highway?

What type of license plate should hybrid vehicles use?

How Long is the Interval Between Subject 1 and Subject 2?

What Documents Are Needed for the Subject One Exam?

What are the common engine sensors?

What are the sidewall markings on Pirelli tires?

What is the Depreciation of a Car After Body Repair and Painting?

What does SAE on engine oil mean?