What are the common faults of automobile engines?

Name a few of the small problems that are prone to arise and the solutions.

1. The engine of the car does not catch fire.

The car sometimes does not catch fire when it starts, which is often encountered by many car owners, first of all, the engine has to start and the spark plug ignition is completed by the current of the battery, so the most likely thing is that the battery is rusty or the battery is dripping. The second is that the engine spark plug is damp on a rainy day. In general, it is necessary to check whether the battery liquid in the battery is sufficient for up to two months (the liquid level is between the upper and lower two engraved lines), and also check the liquid level difference of each tank.

If the liquid level is insufficient, it needs to be replenished. After that, it is also necessary to keep the terminal blocks of the battery clean. If the spark plug is wet, take it out and let the water evaporate as soon as possible.

2. Sudden increase in fuel consumption of automobiles.

As a car owner, if you suddenly find that the fuel consumption of your car has suddenly increased a lot, you can be sure that your car is faulty. There are many reasons for the increase in fuel consumption. In the driving found that the car's coasting distance is significantly reduced, then you should check whether the air pressure of the tire meets the air pressure standard, insufficient tire pressure will not only lead to an increase in driving resistance, resulting in an increase in fuel consumption, but also affect the service life of the tire.

The tires should be swapped every 10,000 kilometers to avoid too much difference in the degree of wear before and after. If you need to replace severely worn tires, it is best to replace two or four tires together, and tires with the same texture can be replaced front and back. In addition, tires with a polyline pattern help save fuel.

Oil, oil filter, air filter and gasoline filter have not been replaced for a long time, resulting in insufficient fuel combustion, and increased engine carbon deposition will also lead to an increase in fuel consumption, oil and oil filters should be replaced every 5,000 kilometers, and air filters and gasoline filters need to be replaced every 10,000 kilometers, otherwise impurities in the air, fuel and oil will cause parts to wear and block the oil circuit, so that the engine does not work properly and cause fuel consumption to increase.

3. There is a problem with the car battery.

Changes in the electrolyte of an automotive battery can affect the performance of the battery. The best operating temperature of the battery is about 25 °, and every 1 ° drop, the usable capacity of the battery will drop around, and after the temperature rises, the capacity of the battery will return to normal, so in cold weather, especially in the northern region, the temperature will often drop to a few degrees below zero, or even dozens of degrees, and the usable capacity of the battery at this time will drop significantly, so try to avoid complete discharge of the battery in winter, and pay attention to whether the electrolyte is frozen. In addition, when driving in summer, the battery will be overcharged, the electrolyte will evaporate quickly, and the plates will be easily damaged.

Therefore, it is necessary to check the liquid level height and electrolyte specific gravity of the battery frequently, and frequently check the filling of distilled water to the battery to ensure the normal operation of the car.

Common faults of automobiles and solutions First, the engine can not start. Causes: a. The engine has been flushed, causing water to enter the distributor, ignition module, spark plug, high-voltage line, etc.

b. The spark plug is damaged. c. The battery voltage is insufficient. d. The inertia switch is disconnected.

Preventive and solution measures: a. Avoid direct flushing of the engine. b. Regularly inspect, adjust or replace the spark plugs. c. Designated service station to inspect and replace damaged parts. d. Charge the battery. e. Press the inertia switch to restore the circuit.

2. The engine is turned off when changing gears. Causes: a. The idle speed is too low. b. The idle shut-off valve is not tightened. c. The gear is too high. d. The oil-gas separator is seriously blocked.

Preventive and solution measures: a. Adjust the idle speed to normal speed. b. Check whether the idle stop valve is tightened and whether the plug is tightened. c. Shift into a lower gear. d. Clean the oil-gas separator at the designated service station.

3. The steering wheel trembles at high speeds. Reason: a. The dynamic balance test of the tire was not carried out after disassembly and assembly. b. The balance weight on the wheel falls off. c. The wheels are stained with mud. d. The wheel is deformed by impact.

Preventive measures: a. Tire dynamic balance testing. b. Pay attention to cleaning the wheels. c. Replace the wheels.

Fourth, the turn is heavy. Reason: a. Tire pressure is not enough. b. The power steering fluid is not enough.

Preventive measures: a. Inflate tires. b. Add power steering fluid.

Fifth, deviation when driving. Reason: a. The air pressure of the left and right tires is inconsistent. b. The front wheel alignment is not accurate. c. A certain brake is locked. Preventive measures: a. Check and adjust the tire pressure. b. Go to the designated service station for maintenance.

There are many common engine failures, such as engine idle jitter. There are many reasons for that. Carbon deposits cause jitter.

The engine cannot be started, the engine stalls, the engine makes abnormal noise, the cylinder pulls, the cylinder bursts, the engine is high, and so on. In repairs, the failure of the engine can be said to be the most. There are also the most points of failure.

The common faults of the engine are unstable idling, weak acceleration, and difficult starting, and basically these three are the most common faults.

An engine is a machine that converts a certain form of energy into mechanical energy. Its function is to convert the chemical energy of liquid or gas into heat energy after combustion, and then convert the heat energy into mechanical energy through expansion and output power. The power of the car comes from the engine.

The engine is the heart of the car, providing power for the walking of the car, and the power, economy and environmental protection of the car. To put it simply, the engine is an energy conversion mechanism, that is, the thermal energy of gasoline (diesel) is converted into mechanical energy by pushing the piston to work when the combustion gas expands in the sealed cylinder, which is the most basic principle of the engine. All the structure of the engine is for the energy conversion service, although the engine has gone through more than 100 years of history with the car, whether it is in the design, manufacturing, technology or performance, control has been greatly improved, its basic principle is still unchanged, this is a rich creative era, those engine designers, constantly integrate the latest technology with the engine, turn the engine into a complex mechatronics product, so that the engine performance has reached a nearly perfect degree, The world's famous automobile manufacturers will also take the performance of the engine as a competitive highlight, first, the role of the automobile engine.

The automobile engine is a device that provides power for the car, is the heart of the car, and is an energy conversion device, which is to convert the thermal energy of gasoline (diesel) into mechanical energy by expanding the gas after combustion in the sealed cylinder, pushing the piston to do work. According to different power**, automobile engines can be divided into diesel engines, gasoline engines, electric vehicle motors, and hybrids.

Second, the classification of automobile engines.

1. According to the working mode of the air intake system, it can be divided into four types: naturally aspirated, turbocharged, mechanically supercharged and double supercharged.

2. According to the piston movement mode, it can be divided into two types: reciprocating piston internal combustion engine and rotary piston engine.

3. According to the cylinder arrangement type, it is divided into in-line engine, V-type engine, W-type engine and horizontally opposed engine.

4. According to the number of cylinders, it can be divided into single-cylinder engine and multi-cylinder engine. Modern cars mostly use three-cylinder, four-cylinder, six-cylinder, and eight-cylinder engines.

5. According to different cooling methods, it can be divided into water-cooled engine and air-cooled engine. The water-cooled engine cools evenly, works reliably, and has a good cooling effect, and is widely used in modern automotive engines.

6. According to the number of strokes, it can be divided into four-stroke internal combustion engine and two-stroke internal combustion engine. Four-stroke internal combustion engines are widely used in automobile engines.

7. Classified according to the way of fuel: carburetor engine and EFI engine and in-cylinder direct injection engine. Hope.

1. The quality of automobile fuel is unqualified.

If the engine fault light on the dashboard of the car is on shortly after the vehicle is refueled, then it is generally because the oil is not added correctly, the quality is poor, and it is not up to standard, which leads to insufficient combustion of the oil-gas mixture when the engine is working. This may not affect driving safety, but it will cause some damage to the engine.

2. Oxygen sensor failure.

At present, there are generally two oxygen sensors installed on the car, one before and after the three-way catalytic converter, which is used to detect the air-fuel ratio of the engine under different working conditions, and at the same time, the front is to provide a signal for the ECU driving computer to adjust the amount of fuel injection and calculate the ignition time. The latter is used to test the working quality of the three-way catalytic converter. If there is a problem with one of them, or if the plug is damaged or loose, it will cause the mixture to be too thin or too thick, and the engine failure light will also come on.

3. The air flow sensor is faulty.

If the air flow sensor is not working properly, the ECU will not get the correct air intake signal, and the problems will be similar to the above, and the engine will not run properly.

4. Carbon deposition in spark plugs.

Carbon deposits in the spark plug will cause abnormal phenomena such as difficulty in starting, unstable idling, excessive exhaust gas, and increased fuel consumption, and the engine fault light will also be on.

5. Engine knocking.

If there is a knock in the vehicle, the vehicle will be weak and noisy, and in severe cases, there will be a sound of cylinder knocking. At this time, the vehicle's engine fault light will also turn on.

6. The water temperature sensor is damaged.

If the water temperature sensor is damaged, the air-fuel ratio will become thinner or thicker, which will cause the engine to work abnormally and cause the engine failure light to turn on.

7. The engine lacks cylinders.

After the engine lacks cylinders, the vehicle will have large fuel consumption, black smoke, weak car acceleration, serious shaking, and increased engine noise.

Common faults of automobile engines are: abnormal lubricating oil consumption, engine overheating, engine compartment odor, etc. Mastering common engine fault maintenance methods can reduce driving safety hazards, and at the same time, regular maintenance can make the engine last longer.

1.Abnormal lubricating oil consumption: During driving, the engine lubricating oil consumption is also higher than usual.

After a certain mileage, the instrument panel quickly shows that the lubricant is insufficient. This situation is usually caused by the following three reasons: First, it may be due to the engine piston sealing problem, resulting in too large a gap between the piston and the cylinder wall, and the phenomenon of oil burning.

Second, it may be that the parts of the engine are seriously worn, which makes the gap between the parts too large, resulting in abnormal lubricating oil consumption. Third, the lubricating oil used in individual engines is not up to standard, resulting in abnormal lubricating oil consumption.

2.Engine overheating failure: Due to the special structure of the automobile engine, it is easy to have a high coolant temperature during operation.

Once the coolant temperature exceeds the normal value, the engine will not be able to dissipate heat normally, which will cause the engine to overheat and affect the normal operation of the engine. The main reasons for abnormal operation of the cooling system are thermostat failure, radiator failure, fan failure, water tank blockage, etc.

3.Engine compartment odor: Affected by the high temperature of the engine, the surrounding wires are easy to burn or melt, emitting a pungent odor. Engine compartment odors can also be caused by the volatilization of a large amount of grease as the engine temperature rises during maintenance.

1.With the growth of the use time of the automobile engine, improper operation, maintenance quality and the influence of the natural environment, each part of the parts due to wear, damage, looseness, aging, poor contact, short circuit and open circuit, etc., so that it produces more than the specified sound in the work, such as the sound of cylinder knocking, the whistling sound of overspeeding, the sound of parts rubbing, etc.

2.LeakageAbnormal engine performanceLeakage refers to the leakage of fuel, oil, cooling water, electrolyte, etc. of the car. This is an obvious malfunction. Leakage is easy to cause overheating, burning and other faults, which should be eliminated in time.

a) Engine compartment odor.

Affected by the high temperature of the engine, the wire is prone to burn or melt around it, and it emits a pungent odor. Engine compartment odor can also be caused by a large amount of lubricating grease applied during maintenance, which volatilizes as the engine temperature rises.

2) Abnormal lubricating oil consumption.

During the driving of the car, the consumption of engine lubricating oil is also more than usual, and the mileage is driven for a period of time (check the transaction price|Matching|preferential policies), the dashboard soon shows that the amount of lubricating oil is insufficient, which is usually due to the following three reasons: First, it may be due to the sealing of the engine piston, resulting in too large a gap between the piston and the cylinder wall, and the phenomenon of burning oil. Second, it may be that the parts of the engine are seriously worn, so that the gap between the parts is too large, resulting in abnormal lubricating oil consumption.

Third, the lubricating oil used in individual engines is not up to standard, resulting in abnormal lubricating oil consumption.

c) Engine overheating failure.

Due to the special structure of the automobile engine, in operation, the coolant temperature is prone to too high, once the coolant temperature exceeds the normal value, the engine can not dissipate heat normally, which will lead to the engine overheating, affecting the normal operation of the engine. The main reasons for the abnormal operation of the cooling system are: thermostat failure, radiator failure, fan not turning, water tank blockage, etc.

What are the common faults of automobile engines?

4) The exhaust exhaust color is abnormal.

Whether the car engine is faulty or not is also a little obvious manifestation, from the abnormal exhaust color analysis of the engine failure. The color of the exhaust gas after normal combustion of gasoline should be colorless, and when it is fired. When the motor fails, the color of the exhaust gas changes.

First, the exhaust gas is black, because the fuel is not fully burned. Second, the fuel does not meet the combustion standard, or the gasoline contains water, which will emit white exhaust gases. Thirdly, when the exhaust color is blue, it may be because the piston ring is worn too much or the oil ring is aligned, etc., causing the oil to jump up and enter the engine combustion chamber, or the oil seeping down from the valve guide is involved in combustion.