What Causes the Buzzing Noise and Resonance in CR-V?

What Are the Causes of Abnormal Noises When Starting a Car?

Abnormal noises when starting a car can be caused by factors such as excessively low engine temperature, thermal expansion of the car's three-way catalytic converter, transmission failure, or wear of the engine belt or chain. It is recommended to visit a 4S shop for maintenance and inspection to eliminate the fault. Causes of abnormal noises when starting a car: Excessively low engine temperature: During a cold start, the engine temperature is too low for normal operation, resulting in some abnormal noises. This is a normal phenomenon, and the noises will disappear once the engine temperature rises to normal levels. Thermal expansion of the car's three-way catalytic converter: If there are abnormal noises when the car is just started but they disappear after a while, this is caused by the thermal expansion of the three-way catalytic converter and is also a normal phenomenon that does not require attention. Transmission failure: One of the reasons for abnormal noises when starting a car is transmission failure, which causes internal gears to rub and produce noises. This situation is more complex and requires professional inspection at a repair shop or 4S shop. Wear of the engine belt or chain: If the engine belt or chain is worn, it can cause friction or idling noises when starting the vehicle. For safety reasons, it is best to directly replace the engine belt or chain in such cases.

17

0

Share

What Causes the Car to Make Abnormal Noises and Fail to Start?

Here are the reasons why a car makes abnormal noises and fails to start: 1. Low battery voltage. You can turn on the headlights and some electrical devices and check whether the instrument panel and interior lighting dim significantly during the startup process. If they do, it indicates insufficient battery voltage, which cannot drive the engine to reach the starting speed. The repeated engagement of the solenoid and starter relay will produce a clicking sound. 2. Excessive carbon buildup in the intake pipe. Excessive carbon deposits on the throttle valve and idle speed motor prevent the engine's air-fuel mixture from reaching the required ratio, causing the vehicle to fail to start. The repeated engagement of the solenoid and starter relay will produce a clicking sound. 3. Insufficient fuel supply in the fuel system. This phenomenon is essentially the same as excessive carbon buildup in the intake pipe, as it also prevents the engine's air-fuel mixture from reaching the required ratio, causing the vehicle to fail to start. 4. Faulty starter motor or related circuits. The solenoid coil cannot maintain engagement and cannot provide starting torque, resulting in the engine's failure to start and producing a clicking sound. 5. Ignition system failure. This directly causes the engine to fail to start. If the ignition key remains in the starting position, the starter relay will repeatedly engage, also producing a clicking sound.

15

0

Share

How to Check the Vehicle's Emission Standard (China)

There are several methods to check a vehicle's emission standard in China: 1. The simplest and most direct way is to look at the vehicle's environmental protection label, which has clear markings on the back. 2. Visit the official website of the Motor Vehicle Exhaust Pollution Supervision and Management Center to inquire. 3. Bring the vehicle registration certificate (original or copy) to the local vehicle management office for inquiry. 4. You can check the vehicle's factory-issued compliance certificate, but these certificates are usually kept at the vehicle management office. It's advisable to make a copy when purchasing a new car for future reference. 5. Make a rough estimation based on the vehicle's registration year. Below is additional reference information: 1. Most vehicles registered after 2008 are China IV standard. 2. For vehicles registered in 2007, some are China III while others are China IV. 3. Vehicles registered before 2007 are generally below China IV standard, meaning they're China III or China II. 4. Vehicles registered before 2005 are mostly China II standard.

1

5

Share

Why is the Malibu X1 considered eerie?

There haven't been any genuinely eerie incidents involving the Malibu XL. The reason it's labeled as 'eerie' stems from an online troll who spread rumors across major Malibu XL forums, claiming the car 'loves drinking blood.' However, this was later confirmed to be malicious misinformation. Reasons behind the Malibu's smear campaign: A primary factor in the persistent negative portrayal of the Malibu XL is its lightweight body design. In the eyes of Chinese consumers, a heavier car body implies thicker steel plates and, consequently, greater safety. The weight reduction of the Malibu XL subconsciously led consumers to equate it with poor safety performance, gradually morphing into the term 'eerie.' Yet, domestic and international safety tests demonstrate that while the Malibu XL has 'slimmed down,' its safety standards remain uncompromised. Malibu evaluation: According to the IIHS crash test results, the Malibu XL received the highest safety rating of 'Top Safety Pick+.' The test results published on the IIHS official website show that in the five major testing categories—25% small overlap front, 40% moderate overlap front, side impact, roof strength, and head restraints & seats—the Malibu XL achieved 'Good' ratings across all five collision tests.

7

2

Share

What does EGR mean in cars?

EGR stands for Exhaust-Gas-Recycling in English, which means Exhaust Gas Recirculation system in Chinese. The purpose of the EGR system is to reduce the emission of NOX in vehicle exhaust, ultimately decreasing atmospheric pollution. More detailed information is as follows: 1. There are two conditions for the generation of NOX: high temperature and excess oxygen. Since exhaust gas contains a large amount of CO2, which cannot burn but can absorb a significant amount of heat, introducing exhaust gas into the combustion process can lower the combustion temperature of the air-fuel mixture in the cylinder, improving the high-temperature and oxygen-rich conditions, thereby effectively suppressing NOX emissions. 2. Due to the characteristics of NOX generation, the EGR system does not operate continuously. It only works during high-speed and medium-load conditions when NOX generation is likely, controlling the pollution levels of NOX emissions. Moreover, the amount of exhaust gas recirculated varies based on engine speed, load, temperature, and exhaust gas temperature to minimize NOX in the exhaust. During engine idling, low speed, light load, or when the engine is cold, excessive exhaust gas recirculation can affect the ignition and performance of the air-fuel mixture, thus impacting engine power. Therefore, the EGR system does not operate under these conditions. 3. If the EGR system is damaged, it may lead to issues such as increased fuel consumption, unstable engine idling, insufficient power, and incomplete combustion.

19

2

Share

Can the Subject 1 Test Be Taken on a Mobile Phone?

Subject 1 cannot be taken on a mobile phone; the test format for Subject 1 is computer-based. The total duration of the Subject 1 test is 45 minutes, consisting of 100 questions in the form of true/false and multiple-choice questions, with a full score of 100 and a passing score of 90. The test papers are randomly selected and combined by the computer driver's license examination system according to the proportion specified in the "Motor Vehicle Driver's License Work Regulations." Test Process: Follow the arrangements of the staff and collect your driving school file in order in the waiting area; Carry and present your ID card for inspection by the supervising officer; Mobile phones must be turned off upon entering the test area; No loud noise is allowed in the test area; Regulation textbooks are not allowed in the test area (or must be placed in a bag); After the test, keep your ID card safe and submit the file to the "Document Submission Window" at the front of the test area; Candidates who pass the test will sign under the guidance of the staff at the exit of the test area before leaving; Candidates who fail the test can leave the test area and wait for notification from their driving school staff regarding the retake time.

19

5

Share

What Causes the Buzzing Noise and Resonance in CR-V?

What Are the Causes of Abnormal Noises When Starting a Car?

What Causes the Car to Make Abnormal Noises and Fail to Start?

How to Check the Vehicle's Emission Standard (China)

Why is the Malibu X1 considered eerie?

What does EGR mean in cars?

Can the Subject 1 Test Be Taken on a Mobile Phone?

What are the impacts of upgrading to larger car wheels?

What Causes the Highlander to Burn Engine Oil?

Which Volkswagen model is the extended version sedan?

What Causes the Jetta's Gear Shift to Be Not Smooth?