What are the common mistakes in car maintenance?

There are many mistakes in car maintenance and use. Some common sense mistakes are made not only by novices, but also by some old drivers. Some wrong practices in the process of automobile maintenance and use may not only damage the automobile itself, but also endanger the driving safety.

Myth 1: It is best to reduce tire pressure in summer. The temperature is high in summer. Some drivers are afraid that the tire will expand when heated, which will lead to high tire pressure and puncture. Some even artificially reduce the tire pressure. In fact, low tire pressure is more dangerous than high tire pressure.

When the tire pressure is too low, the contact area between the tire and the ground increases.

On the contrary, the temperature in the tire will rise rapidly when driving, and it is easy to puncture when driving too fast, which endangers driving safety. In addition, low tire pressure will cause tire deformation, increased wear and fuel consumption. Professional tire pressure measurement and maintaining normal tire pressure are particularly important in driving in summer.

Myth 2: The lower the engine cooling water temperature, the better. It is very hot in summer. Some drivers think that the lower the engine cooling water temperature, the better. In fact, low water temperature will damage the engine. Automobile engines are afraid of both heat and cold. If the cooling water temperature is too low, it will worsen fuel combustion, increase engine oil consumption, aggravate wear, increase engine oil viscosity and reduce engine power. Different types of engines may have different requirements for water temperature, and the key is to control it within a reasonable range.

Myth 3: The more oil, the better. When the oil in the engine oil pan is insufficient, the lubrication is insufficient, the friction is intensified and the engine is damaged; However, if there is too much oil, the engine will violently stir the crank and the big end of the connecting rod when working, which will make the engine unstable, and the oil splashed on the cylinder wall will increase, which will lead to poor oil combustion and discharge, and may also cause danger under certain circumstances. Therefore, the oil should be controlled between the high and low marks of the oil dipstick.

Myth 4: High-grade overtaking or high-grade climbing has smaller torque, slower throttle response, but slower acceleration. Overtaking at high speed is very dangerous. If overtaking is correct, you should slow down by one gear. In automatic transmission, just step on the accelerator to the end.

Climbing at high speed is also dangerous. When the vehicle is in a high gear and the accelerator is driving on a slope, the driving resistance of the vehicle is large, which makes the engine speed low, the disturbance of the mixture in the combustion chamber is small, and the flame triggered by the spark plug is slow, which makes the combustible mixture automatically deflagrate. Long-term strong deflagration will cause local overheating, melting and damage of related components, and may also cause excessive torque load of engine crankshaft pads and crankshaft, leading to malignant accidents such as tile burning and even crankshaft fracture.

Myth 5: Some people are afraid of braking flameout and develop the habit of stepping on the clutch before braking; Others think that braking will be more effective after cutting off the power supply, which is wrong. In any case, driving with the clutch on will increase the inertia of the car. After stepping on the clutch, the engine speed quickly drops to idle speed, the total vacuum degree of the intake pipe decreases, the auxiliary force of the vacuum booster is greatly reduced, the braking distance becomes longer, and the braking is weak. The correct way is to step on the brake first, and then step on the clutch when the bus stops soon.

Myth 6: When turning while braking, the center of gravity of the car moves outward under the action of centrifugal force. At this time, braking will aggravate the roll and cause unilateral braking. If you drive too fast or brake too hard, you are in danger of overturning. The correct way is to slow down before entering the corner and shift to a low gear. Add oil slowly after entering the corner to keep the car body stable. At the same time, when cornering, keep the principle of "slow in and fast out", bend from the big corner of the outer lane and straighten the corner as much as possible. Myth 7: Downhill neutral sliding is both fuel-efficient and convenient. The carburetor car can save fuel by neutral, and the EFI car can save fuel by sliding in high speed, but it costs fuel to stay in neutral.

It is quite dangerous to control the speed only by braking when sliding down the slope, especially on long slopes and steep slopes. Due to the long-term use of braking, the brake friction plate will overheat, the friction coefficient will decrease, and thermal recession will occur, which will lead to the decline or even failure of automobile braking performance. The correct way is to put a suitable gear according to the actual speed and let the engine brake. At the same time, it is very important to rely on gear braking when encountering steep slopes or winding roads.

Myth 8: Braking in water or driving in rainy days, the accelerator is suddenly released at high speed, and one side of the wheel suddenly hits the waterlogged road surface. Many people's first reaction is to step on the brakes, which makes it easy to slip. At this time, controlling the steering wheel is more important and safer than stepping on the brakes.

Driving on muddy roads in rainy days, suddenly stepping on the accelerator or suddenly releasing the accelerator will also cause sideslip. Because the car suddenly loosens the throttle when driving at high speed, it will cause the car to suddenly slow down, causing the wheels to brake with the ground instantly, thus causing side slip; On the contrary, sudden increase in speed is also prone to side slip. Therefore, it is necessary to drive at a low speed and control smoothly in rainy days.

Myth 9: It is safe to lock the central door lock while driving. Some people like to lock the central door lock as soon as they start the car. They think it is safe, but it is extremely dangerous. After the central door lock is locked, once the car has an accident, it can't be opened, and the accident rate is greatly improved. It is best not to lock the central door lock when driving normally, and then lock the central door lock when encountering traffic jams or waiting for traffic lights.

Myth 10: The stronger the high beam at night, the safer it is or the safer it is to turn on the fog light. The greater the illumination angle of the lamp, the safer it is. The higher the light, the brighter it will be, because it will affect the sight of oncoming cars.

Driving with fog lights at night is not only unsafe, but also dangerous. Especially, the white beam of the front fog lamp is very strong, which affects the safety of the opposite vehicle and itself. If the weather is bad, turn on the fog lights no matter day or night.

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