What Causes Engine Misfire in a Car?

What are the reasons for the air conditioning not cooling in new energy vehicles?

The reasons for the air conditioning not cooling in new energy vehicles include: lack of refrigerant. Below are the relevant details: Lack of refrigerant: The most common reason for reduced cooling capacity is the natural depletion of refrigerant. The vehicle's air conditioning system consists of numerous metal pipes, and there are tiny gaps between the connections of these pipes. Therefore, strictly speaking, the refrigerant ("Freon") in the air conditioning system does leak, though the leakage is usually minimal. Diagnosis: The refrigerant level in the air conditioning system can be determined by checking the pressure in the high and low-pressure pipes when the air conditioning is in cooling mode. The high and low-pressure inspection pipes are located in the engine compartment and can be checked using a specialized pressure gauge. When the air conditioning system is operating, the pressure in the high-pressure pipe should be around 12.5 bar, and the pressure in the low-pressure pipe should be between 1.5-2.5 bar.

1

5

Share

What are the reasons for the Volkswagen EPC light being on and the car not starting?

When the Volkswagen EPC light is on and the car fails to start, after turning the ignition key, the vehicle begins its self-check, and the EPC indicator light will illuminate for a few seconds before turning off. If the light remains on after the vehicle starts, it indicates a fault in the vehicle's mechanical and electronic systems. Generally, there are two possible reasons for the EPC light to stay on. One is a dirty throttle body, which should be cleaned. The other possibility is that the brake lights are not functioning, requiring an inspection of the brake switch and wiring. More details are as follows: 1. EPC stands for Electronic Power Control, and many people also refer to it as the electronic throttle. This system consists of various sensors, controllers, and other components. When a sensor malfunctions or detects an abnormal condition, the control system will take appropriate measures based on pre-set programs. 2. The EPC indicator light is relatively common in Volkswagen vehicles. After turning the ignition key, the vehicle begins its self-check, and the EPC light will illuminate for a few seconds before turning off. If the light remains on after the vehicle starts, it indicates a fault in the vehicle's mechanical and electronic systems. 3. Generally, there are two possible reasons for the EPC light to stay on. One is a dirty throttle body, which should be cleaned. The other possibility is that the brake lights are not functioning, requiring an inspection of the brake switch and wiring. Additionally, due to fuel quality issues, the EPC warning light may also illuminate.

14

2

Share

Should I apply the car film myself or have it done at the 4S shop?

First, check the quality of the film by feeling its thickness. Generally, very thick films are of lower quality and cheaper. Also, see if you can see outside from inside the car after the film is applied. If you can, it's a good film. After evaluation, if the film is of good quality, it can be accepted. Summary: For free films offered by 4S shops, assess the quality of the film and confirm whether it includes the front windshield. If the film is of poor quality or doesn't cover the front windshield, you can choose to apply it yourself later. Additional Information: Quality inspection of car films: Check if there are any dust particles or bubbles in the entire heat-insulating film. Ensure the edges are firmly adhered. Edges are most prone to dust accumulation and test the technician's attention to detail.

16

1

Share

Does engine oil exceeding six months have a significant impact?

Engine oil exceeding six months has a considerable impact. Here are the relevant details: Reason: If the engine oil has exceeded six months, it is recommended to replace it. Once oxidized, the sealing and lubricating properties of engine oil significantly decrease, and the most significant impact of reduced lubrication is severe engine wear. Additional information: If engine oil is not changed for an extended period, it will accumulate many impurities, such as iron filings and large dust particles, leading not only to wear issues but also to corrosion of internal components. Once the engine oil deteriorates and its performance declines, the lubrication properties of bearings and the cooling function of mechanical transmission parts will be lost, adversely affecting the vehicle's optimal driving condition.

15

5

Share

What are the key points to observe for parallel parking in Subject 2 of the driving test?

For parallel parking in Subject 2, there are mainly 2 key points to observe: point A at the upper left corner of the parking space and point C at the lower right corner. Below are the precautions for Subject 2 test: 1. Reverse parking into the garage: The main points for deduction include crossing the line while reversing, failing to enter the garage, exceeding the time limit, and not following the designated route. After the regulation reform, a time limit of 210 seconds is imposed for reverse parking, and exceeding this time will result in failure. During the test, you must first reverse into the right garage, then the left garage. Not following this sequence will result in failure. Pay attention to maintaining a 30cm margin while reversing. 2. Parallel parking: The main points for deduction include turn signals, 30cm margin, and crossing the line. When entering the test area, steer right in advance and align the highest point of the windshield wiper with the roadside line to adjust the 30cm margin. While reversing, remember the first right full lock point, straightening, left full lock, parking in the garage, and turning on the left turn signal. When exiting, observe the rearview mirror to prevent the wheels from crossing the line on either side. 3. Right-angle turn: The main points for deduction include turn signals and crossing the line. After entering the test area, turn on the turn signal and turn it off after the voice prompt. Incorrect operation of the turn signal will deduct 10 points. After entering the right-angle turn, adjust the body to maintain a 30cm margin from the side line, similar to parallel parking. When making the full lock, slightly release the clutch to prevent stopping or stalling midway. Straighten the body after the rear wheels exit to prevent the wheels from crossing the line.

16

1

Share

Is the NC contact of a relay normally open or normally closed?

Relay NC is a normally closed contact, which refers to a contact that remains closed and conductive when no power is applied. A contact refers to the output form where the load current is not connected when the detection body is inactive. The working principle of a relay is: when the change in the input quantity meets specified requirements, it causes a predetermined step change in the controlled quantity within the electrical output circuit. Relays are used in automated control circuits as automatic switches that use small currents to control the operation of large currents. Their functions in circuits include: 1. Automatic regulation; 2. Safety protection; 3. Circuit switching. They are categorized into normally open type, normally closed type, and changeover type.

2

5

Share

What Causes Engine Misfire in a Car?

What are the reasons for the air conditioning not cooling in new energy vehicles?

What are the reasons for the Volkswagen EPC light being on and the car not starting?

Should I apply the car film myself or have it done at the 4S shop?

Does engine oil exceeding six months have a significant impact?

What are the key points to observe for parallel parking in Subject 2 of the driving test?

Is the NC contact of a relay normally open or normally closed?

What causes the excessive resistance in the B1346 driver's seat airbag?

What are the reasons for the Lynk & Co 01's network connection failure?

What are the differences between the Volkswagen Magotan 330 and 380?

Can I Apply for a Green License Plate If I Already Have a Shanghai License Plate?