Spring and summer alternations, the temperature change difference is relatively large, for the car, to experience the temperature rise brought about by the oil and gas and other aspects of the change, in advance to do the car inspection and maintenance, in order to better prevent the vehicle situation, so again busy to check. Four essential testing items at the turn of spring and summer include: First, do not remove the cleaning valve carbon deposit, clean the fuel nozzle and replace the spark plug The direct consequence of the formation of carbon deposits on the back of the valve is poor engine acceleration, unstable idle speed, sometimes accompanied by a series of problems such as intake manifold firing, and cold car starting difficulties. Cleaning carbon accumulation is usually done without disassembly. If the carbon accumulation is serious, the cylinder head can be used to clean the valve. Through the analysis of the maintenance station, it is found that it is a gradual process from the formation to the accumulation of carbon to the influence of the normal operation of the engine; When the engine is difficult to start and the idle speed is unstable, it indicates that the carbon accumulation has been quite serious, and further it will cause a fire and break the cylinder until it can not start. In order to avoid the loss caused by the removal of the cylinder head, it is recommended that the owner find that the cooling car is difficult to start, immediately go to the maintenance station for inspection, and the valve should be cleaned in time after excluding other factors. Do a clean valve carbon, clean the nozzle and replace the spark plug, when checking the oil and cleaning the three filters, the nozzle and spark plug most people will remember, but the cleaning of the carbon deposit sometimes will be missed. In the current case of such a high oil price, cleaning the valve carbon deposit can greatly reduce fuel consumption, it is necessary. 2. Check the air conditioner and clean the air filter Air conditioning is like the human body, do not maintain, do not exercise, some small problems do not go to the doctor, the body naturally worse and worse. The air conditioner is used for a long time, it will naturally be dirty, and it has to be cleaned and maintained. Good maintenance, not only eliminate the air conditioning pollution hazards, clean the air, but also make the air conditioning performance as new, save electricity and energy, extend the service life. "Winter dirt, spring bacteria breeding", in fact, air conditioning is very vulnerable to pollution. Cleaning the room, changing clothes, people moving around, pollen, suspended solids from smoking, talking, coughing, sneezing, etc., may cause biological pollution in the air conditioning in the home. Due to infrequent cleaning, a lot of dust is deposited on the air conditioning filter net, and the breeding bacteria live in the inlet and outlet, filter net, air conditioning pipe, evaporator, condenser and other places. If it is not removed in time, after the air conditioner is turned on, these germs will float into the room with the cold air sent by the air conditioner and cause illness. Check the air conditioner, clean the air filter, with a winter of air conditioning, there will be a lot of dust and bacteria deposited in the filter or evaporation box, if not cleaned, not only in the summer use will affect the coolness of the cold air, so that the air volume is reduced, while harmful dust and bacteria will harm health. Third, check the brake oil and brake pads In order to ensure driving safety, we must maintain the brake system, and the maintenance of the brake system is ultimately two aspects of brake pads and brake oil, because the brake power of the car accounts for most of them. So, how should we treat the two key factors that determine the braking effect - brake pads and brake oil? 1, brake pad inspection No matter any brake system is ultimately by the brake pads (disc) or brake shoes (drum) to complete the braking role, so regularly check the thickness of the brake pads or brake shoes. When the thickness is found to be close to or less than the minimum thickness specified by the manufacturer, it should be replaced immediately. Check the brake pads at the same time, but also check the brake disc or brake drum wear, such as the contact surface of the indentation, to timely disc or light drum to ensure the contact area with the brake pads, improve the braking force. 2. Check brake oil Before checking the brakes, carefully wipe the dirt off the master cylinder to prevent any dirt from falling into the tank. Remove fasteners (usually pins) and covers. For the cylinder without a scale, the liquid level should be kept 6 mm from the top of the cylinder, if there is a scale, as long as the liquid level is higher than the scale. Check the brake oil and brake pads, the brake system is extremely important for the safety of the car, to often check the oil level of the brake oil pot, the oil level is lower than the lower limit, to be added to the upper limit in time. In addition, because the brake oil itself has strong hygrophilicity, after a period of use, the brake oil will reduce the boiling point of the brake oil due to the absorption of too much water in the surrounding air, and the brake oil will cause brake lock or failure when boiling, therefore, the brake oil must be replaced regularly. When different brands of brake oil are mixed, it may react or corrode the brake system, and the same brand of brake oil must be replaced when replacing. Brake pads are the most easily worn parts of the brake system, the need to check the degree of wear often, if the degree of wear exceeds the limit required by the manufacturer, it must be replaced. Four, wheel dynamic balance and tire pressure Wheel dynamic balance and tire pressure, normal every 10,000 kilometers to the car balance detection, so the detection of 20,000 kilometers is essential, especially the mountain road, curves, snow and other road conditions are more complex, must not ignore this item. Remind the owners, it is coming to the summer, the hot and rainy weather will soon be more, to do maintenance of the car must look at the tire pattern and tire pressure, it is best to fill a little nitrogen, so that the temperature will not change when the tire pressure is also a big change. How does the owner inflate the car tire on a daily basis? 1, after driving for a period of time, the car stops to wait for the tire heat and then gas. This is because the tire temperature will rise when the vehicle is driving, which has an impact on the air pressure. Car owner (15) Four major items for spring and summer alternate vehicle maintenance 2. Check the valve nozzle. If the valve nozzle and valve core are not matched smoothly, there are protruding and concave phenomena and other defects, which are not easy to inflate and measure air pressure. 3, pay attention to cleaning inflation. The air filled should not contain water and oil to prevent deterioration of the inner tube rubber. 4, inflation should not exceed the standard too much, nor can it be inflated too much due to long-term business trips. Because the excess of the standard will promote excessive extension of the cord, causing its strength to reduce, affecting the life of the tire. 5, inflation operation should be careful. The dust on the valve mouth should be wiped before inflation, and the valve core should not be loosened. After aeration, apply soap to the valve mouth to check whether there is air leakage. If there is air leakage, continuous small bubbles will be generated. Then tighten the valve cap to prevent sediment from entering the inside of the valve nozzle. How to use tires to save fuel? 1, select the size, specifications of the vehicle design of the tire. Try not to modify, if conditions can choose some fuel-saving tires. 2, regularly check the tire pressure, it is recommended that the owner of the friend check at least once a month. 3, let your car always keep the wheel positioning correct and dynamic balance accurate, can ensure a low fuel consumption rate. 4, conditional owners can fill the tires of the car with nitrogen (including the spare tire).