What to Do When the Car in Front Reverses on a Highway Ramp?

What Causes the Abnormal Noise When Starting and Braking?

The reasons for abnormal noise when starting and braking are as follows: 1. When the brake pedal is slowly released, the engine already has sufficient power to drive the car forward, but the brake is not fully released. In this case, the moving wheels are restrained by the braking system, naturally causing abnormal noise, which is a normal phenomenon. 2. Abnormal noise when braking during car start-up is a normal phenomenon for automatic transmission vehicles. The slower and lighter the release, the more noticeable this noise becomes. This is because, in an automatic transmission car, as long as the gear lever is not in the parking gear (P) or neutral gear (N), the engine has power output, even at idle speed. To stop the car, the brake pedal must be pressed. Additionally, the issue might also lie with the brake pads.

19

3

Share

What Are the Parts to Clean Carbon Deposits in an Engine?

Engine carbon deposit cleaning involves the following parts: 1. Cleaning throttle body carbon deposits: Remove the engine cover, detach the throttle body, clean it with a cleaning agent, dry it with a cloth, and reinstall it. It is recommended to clean every 20,000 kilometers. 2. Cleaning internal engine carbon deposits: Open the oil cap, pour in the entire can of cleaner (mixed with old engine oil), close the oil cap, start the engine and let it idle for 10 minutes before shutting it off. Cleaning internal engine carbon deposits dissolves sludge, gum, moisture, and metal debris inside the engine, reducing contamination of new oil and extending the engine's lifespan. It is recommended to clean every 40,000 kilometers. 3. Cleaning fuel system carbon deposits: This includes cleaning the fuel injectors, combustion chamber, spark plugs, and throttle valve. The goal is to address issues such as insufficient power, increased fuel consumption, engine shuddering, poor acceleration, or difficulty starting caused by carbon deposits, gum, and dirt in the fuel system. No disassembly is required; simply add a specialized fuel system cleaner to the fuel tank periodically for effective cleaning. It is recommended to add the cleaner every two fuel tank refills. 4. Cleaning intake system carbon deposits: This mainly involves cleaning carbon deposits in the intake ducts and intake manifold. The purpose is to remove carbon buildup inside the intake system, improve airflow and speed, and reduce engine shuddering and idle instability. Typically, 4S shops or repair shops use a hanging bottle method to inject intake cleaning fluid into the intake pipe. The cleaner participates in combustion to remove carbon deposits on valves, combustion chambers, and piston heads. For naturally aspirated engines, cleaning every 40,000 kilometers is recommended; for turbocharged engines, cleaning every 20,000 kilometers is advised. Carbon deposits are a coking substance formed from unsaturated olefins and gum in fuel under high temperatures during engine operation. They can adhere to various engine parts, significantly impacting the vehicle by reducing engine power, increasing fuel consumption, and in severe cases, causing engine knocking, piston damage, or even excessive oil consumption. They also affect the vehicle's exhaust emissions.

20

2

Share

What Causes an Automatic Transmission Car to Stall While Driving?

There are several reasons why an automatic transmission car may stall: 1. For older models, the reasons for stalling, aside from insufficient driving skills, include the use of substandard fuel leading to engine carbon buildup and subsequent stalling. 2. For new cars, stalling is primarily caused by insufficient driving skills. Another possibility is issues with the car's engine or fuel system. However, for new cars, the likelihood of engine problems is relatively low, with most cases being related to fuel system issues. 3. Automatic transmission models are less prone to stalling compared to manual transmission models, where stalling may occur frequently due to lower driving proficiency. However, it's not impossible for automatic transmission cars to stall, with the main cause being the use of low-quality fuel leading to engine carbon buildup and stalling.

10

4

Share

What is the method for adjusting valves in a four-cylinder engine?

Four-cylinder engine valve adjustment methods are as follows: 1. Cylinder-by-cylinder adjustment method: According to the cylinder firing order, after determining that a certain cylinder's piston is at the compression top dead center position, the intake and exhaust valve clearances of this cylinder can be adjusted. After adjustment, rotate the crankshaft and gradually adjust the valve clearances of other cylinders using this method. 2. Two-step adjustment method: (1) Rotate the crankshaft to position the first cylinder piston at compression top dead center, aligning the flywheel mark with the inspection hole marking line. At this time, valves 1, 2, 4, 5, 8, and 9 can be adjusted (referring to the engine valve arrangement order from front to back); (2) Then rotate the crankshaft one full turn to position the sixth cylinder piston at compression stroke top dead center, and adjust valves 3, 6, 7, 10 plus two additional valves (i.e., 11, 12). This is essentially a memorization-based adjustment method. (3) During adjustment, while turning the adjustment screw, insert a feeler gauge between the valve stem end and the rocker arm and pull it back and forth until slight resistance is felt. Then recheck until the adjustment is appropriate.

3

0

Share

How to Start a Car with a Dead Battery?

Methods to start a car with a completely dead battery: 1. Push-start Method: First, turn the key to the ignition position, depress the clutch, release the handbrake, and set the gear to 1st or 2nd. Keep the clutch depressed and start pushing the car. When the speed reaches about 5 km/h, slowly release the clutch while pressing the accelerator to start the engine. 2. Jump-start Method: (1) Open the hoods of both cars. Connect the negative terminal of the jumper cable to the dead battery's negative terminal and the other end to the donor car's negative terminal. (2) Similarly, connect the positive terminal of the jumper cable to the dead battery's positive terminal and the other end to the donor car's positive terminal. (3) Have the donor car start its engine and rev the engine slightly, then attempt to start the dead car. 3. Towing-start Method: First, secure a tow rope and firmly tie the front and rear of both cars together. Begin towing slowly, ensuring both vehicles maintain a safe speed while paying attention to driving safety during the process.

6

0

Share

How to Check a Vehicle's VIN Number?

The locations of the VIN number are as follows: 1. For trucks and large vehicles, it is generally located at the rear of the vehicle frame on the right side. 2. For small cars, it is usually found in the lower left corner of the front windshield under the wiper deflector or under the door frame of the passenger seat. 3. For motorcycles, there is a vehicle nameplate under the odometer that displays the VIN number. 4. The vehicle registration certificate has a "VIN number" section where it is indicated. 5. It can also be found on insurance documents and engine nameplates, among other places. Note: The common method for querying is for public security, procuratorial, or judicial departments to apply for an official query at the vehicle management office or traffic police with a case investigation document. Since vehicle owner information is classified as controlled private information, individuals do not have the right to query it. The vehicle management office only provides status information queries to the vehicle owner upon presentation of identity proof.

13

2

Share

What to Do When the Car in Front Reverses on a Highway Ramp?

What Causes the Abnormal Noise When Starting and Braking?

What Are the Parts to Clean Carbon Deposits in an Engine?

What Causes an Automatic Transmission Car to Stall While Driving?

What is the method for adjusting valves in a four-cylinder engine?

How to Start a Car with a Dead Battery?

How to Check a Vehicle's VIN Number?

How to adjust the clutch on Nissan X-Trail?

How to Determine Whether a Vehicle is China 5 or China 6 Standard?

What Needs to Be Replaced for Engine Cylinder Scoring?

What is the difference between 3st and 4st tires?