Common faults and maintenance of automobiles
1. Abnormal engine oil pressure indicator.
Cause: When the instrument pointer shows abnormal oil pressure, it indicates that there is something wrong with the engine parts. If the indicating pressure of the oil meter is low or the indicating pressure of the instrument fluctuates greatly, it may be caused by the abrasion of the oil pump, the blockage of the filter by dirt, the exposure of the oil suction net to the oil level, the low oil level, the air-air mixture in the oil circuit, the failure of the pressure gauge, etc. In addition, the viscosity of lubricating oil is low, the sealing and lubricity of oil circuit are poor, the supercooling viscosity of lubricating oil is too high, and the lubricating oil sludge is deposited too much. It will also cause the oil pressure indicator to display abnormally.
Solution: You should go to the repair shop for replacement and maintenance in time.
2. Unscrew the radiator cover and find that there are always some oil stains floating on the water surface, and there is moisture when changing oil.
Cause analysis: The engine has two circulation systems, one is coolant circulation system and the other is lubricant circulation system, and the two systems are not connected with each other. If there is oil in the water or there is water in the oil, it means that there is a problem in an isolated place in the two circulation systems. "Oil into water" and "water into oil" are two different faults. "Oil into water" is the problem of engine block itself, while "water into oil" is mostly caused by engine parts, and the fault nature is different.
Solution: You should go to the repair shop for replacement and maintenance in time.
3. When the car accelerates, the oil pressure indicator will light up.
Cause analysis: there are two kinds of oil lamp lighting: true and false. In fact, the oil pressure is really low, so low that the indicator light gives an alarm, which indicates that there is a problem with the lubrication system and must be eliminated. The so-called virtual, as suspected, there is no fault in the oil lubrication system, but there is a fault in the oil pressure indicator system and the indicator light is in the wrong position.
Solution: Although this kind of fault will not affect the normal operation of the engine, it is best to find the root cause and eliminate it in time. In general, the possibility of actual symptoms is high, which should be used as the main idea to judge the fault.
When the car is in trouble, the steering wheel will swing, especially when the car is fully loaded.
Cause analysis: Generally, it is caused by uneven wear of front tires, uneven use of newly repaired tires or pads, and rim deformation. Because, when the wheel speed is fast, the torque driving the steering wheel mainly comes from the deflection of the tire or rim. When the tire or rim misalignment exceeds 3 mm, the yaw moment can drive the steering wheel to swing left and right.
Solution: You should go to the repair shop for inspection and replace the tire or rim if necessary.
5. Driving at a high speed on a good road, the steering wheel swings when the vehicle is heavy, and it swings badly when the vehicle is heavy. The faster the vehicle speed, the more serious the swing.
Cause analysis: Generally, the connecting bolt between the brake drum and the hub is loose, the bearing hole of the hub is loose, and the boring of the brake drum is eccentric, which makes the brake drum different in thickness and causes imbalance.
Solution: Go to the repair shop for repair in time.
6. Excessive engine oil consumption
Cause analysis: Careful friends will find that even if the vehicle is in good condition, the lubricating oil is normally consumed. However, when some vehicles are in poor condition, the vehicle exhaust will emit blue smoke. In practice, this means that lubricating oil is consumed excessively. Generally speaking, there are only two situations of lubricating oil consumption: entering the combustion chamber to participate in combustion or oil leakage. The reason why engine oil can escape into the combustion chamber is mainly due to the serious wear of parts, too large fitting clearance or too high oil pressure, which leads to the engine oil escaping into the combustion chamber. Oil leakage is mainly caused by gasket hardening and aging and valve blockage. If it is a classic car, the gasket is generally not tightly sealed due to aging.
Solution: It is best to implement effective solutions through the judgment of professional maintenance centers and maintenance engineers.
7. When the door glass rises and falls, there will be a slight "creaking" sound.
Reason: After the car is used for a period of time, there will be a slight "rattle" sound when the door glass rises and falls. Especially the driver. This is mainly because there are strong winds and sandstorms in the north, which often leave some fine dust and gravel at the contact between the door glass and the sealing strip, causing noise when the glass rises and falls. At this time, it is necessary to clean the sealing strip of the door glass and the dust in the velvet groove of the chute in time, otherwise it will scratch the door glass.
8. When the turn signal is turned on, the flashing frequency is faster than usual.
Cause: When the turn signal handle moves, the turn signal on the dashboard flashes faster than usual, which is a fault. It is usually caused by the change of line resistance after the turn signal bulb on one side is broken.
Solution: You should go to the repair shop for replacement and maintenance in time.
9. The windshield can't be cleaned when it rains lightly.
Cause analysis: it feels good to use the wiper when the rain is not big, but starting the wiper when it is light rain will find that the wiper will leave uneven wiping marks on the glass surface; This situation shows that the wiper blade has hardened, or the wiper blade has scars, which will lead to uneven wiping and residual dirt.
Solution: Replace the wiper or wiper film surface. However, it should be noted that the installation method and length of the wiper are different for different models and years. Some wipers only need to replace the rubber plate, while others need to be replaced as a whole.
10. Warm air is turned on in winter, and the windshield is foggy and sweet.
Cause analysis: This phenomenon will occur when vehicles use warm air, which is generally caused by slight leakage of the heating water tank in the cab. The fog on the windshield is caused by the wind generated by the blower in the car, which drives the leaked antifreeze to blow out of the air duct and condense on the windshield. People can also feel the special taste of antifreeze. Turn off the fan at this time, and the fog will gradually disperse.
Solution: You should go to the repair shop for replacement and maintenance in time.