What should I do if the engine fault light is sometimes on and sometimes it is not?

1. The sensor is damaged, the contact is poor, or the signal is interrupted; 2. Poor engine maintenance; 3. The quality of fuel and oil is not good; 4. The combustion of the mixture is insufficient; 5. Spark plug failure, ignition coil failure; 6. The fuel pump is faulty and the oil circuit is blocked; 7. The air conditioner filter is blocked.

1. Sensor problems; The sensors mentioned here include water temperature, crankshaft position, air flow, intake air temperature, oxygen sensor, etc., when these sensors are damaged, poor contact or signal interruption, the ECU of the car can not accurately obtain the engine data, at this time it will cause the engine fault light to turn on. 2. Maintenance problems; Poor engine maintenance is the most common cause of engine failure to light up. We know that the vehicle has a certain maintenance cycle, if the owner does not maintain on time, coupled with bad driving habits, then it will increase the burden of engine operation, and finally can only remind you through the fault light to care about your car 3, oil quality problems; The oil quality here includes fuel and engine oil, we know that the fuel filled by the car is generally marked, and the engine oil is also semi-synthetic and fully synthetic, the manufacturer will generally recommend the owner to use which grade of fuel, which type of engine oil, if the owner does not add as required, it will cause wear and tear of the engine in the long run, and the fault light is not to blame.

Poor combustion of the mixture; The failure of the spark plug, ignition coil, fuel pump, and oil circuit blockage of the engine will cause poor combustion of the engine mixture. Poor combustion of the mixture is caused by the problem of engine carbon deposition or knocking, and these will eventually be detected by the engine's oxygen sensor and reported to the ECU, which will naturally turn on the fault light to warn of the intake air intake problem; When the engine burns, it needs to take intake, the air filter element is very important in this process, if the air filter element of the car is not clean, it will affect the air intake of the car if it is not cleaned regularly, and it will be blocked for a long time, and if it is serious, it will cause the engine failure light to turn on. pressurization issues; Intake booster lines and turbochargers can also cause engine failure lights to illuminate.

The most common of these is turbocharger damage, while the vehicle can also experience symptoms such as oil leakage, high oil consumption, loss of power, metal noise, and blue or black smoke from the exhaust pipe. 7. Exhaust problems; Rear oxygen sensor, three-way catalytic converter, exhaust camshaft and bearing. The most common of these is a failure of the three-way catalytic converter that causes the engine failure light to illuminate.

The use of leaded gasoline, the use of leaded or silicone lubricant additives, the bump of the three-way catalytic converter, and the failure of the engine oil supply system are some of the factors that can easily cause the failure of the three-way catalytic converter. anti-theft system; If the car's electronic immobilizer fails, or if the immobilizer does not match the engine electronic controller, the immobilizer system will also cause the engine to not work properly and the engine fault light will be lit at the same time.

The engine fault light is sometimes on, sometimes it is not on, at this time you don't need to pay too much attention to it, and then repair it when the fault light is completely on, the fault light can be on, and the car can drive. If you particularly want to solve this problem, then go to the repair shop to check the fault code to check the cause.

Since I haven't seen the current car, I can only help you analyze the reasons for this failure. The main reason for the engine failure light is that the throttle valve or the engine has too much carbon deposit, and the oxygen sensor has a faulty mixture ratio that causes the gas to be out of balance, which is easy to turn on the engine fault light; If you're driving at a low speed in the city for a long time, this can easily happen. It is also necessary to pay attention to check whether the fuel injector is leaking, resulting in the fuel injector being in the state of fuel supply after the throttle, resulting in the mixture being too thick when driving at low speed, which will lead to unstable idle speed after oil rewinding, and if it is serious, it will lead to stalling.

Carbon deposits can cause insufficient combustion of gasoline and cause the engine to shake. The impact of engine carbon deposition on the car is quite large, first of all, to reduce the engine power, that is, to make the power output uneven and gradually decay, in other words, more and more powerless. The second is to increase fuel consumption and increase your financial burden.

The third is the difficulty of cold start, that is, the difficulty of ignition, it is not easy to get on the car, and finally the carbon deposit in the combustion chamber is strict, and a heavy one will also cause cylinder detonation, and there will be a sound of low-speed acceleration, which will cause damage to the piston and crankshaft, and cause high temperature of the engine, which will seriously affect the safety of the car. Then there is the excessive discharge, which not only fails the annual inspection and inspection, but also directly aggravates the harm of polluting the environment.

There is another reason: the throttle valve is faulty. Both of these problems can cause engine shake and unstable speed.

Let's talk about buying a car, using a car, maintaining a car, and repairing a car.

When it is bright, drive it to the repair shop as soon as possible and check it with a computer.

Occasional failures, it is recommended to read the code when there is a failure.

1. Too much carbon deposits inside the throttle or engine.

2. After the failure of the oxygen sensor, the mixture is out of balance. This phenomenon is easy to occur if you drive at low speeds in urban areas for a long time.

3. The phenomenon of leakage of the fuel injector leads to the fact that the fuel injector is still in the state of oil supply after the throttle is collected, resulting in the mixture being too thick when driving at low speed, resulting in unstable idle speed after the fuel injector. If it is severe, it will be turned off directly.

The engine fault light sometimes turns on and sometimes does not light to indicate that the engine is faulty, and when it does not affect the normal driving, the engine fault light will go out, and when there is a fault, the yellow light or red light will be on. There are many reasons for the engine to turn on, such as the failure of the front and rear oxygen sensors, the problem of oil products, the failure of the air flow sensor, the failure of the spark plug, the failure of the water temperature sensor, etc., which need to be connected to the diagnostic computer for troubleshooting.

For the problem that the engine fault light does not light up, when the exhaust emission exceeds the standard, the ECU of the driving computer has no way to restore the exhaust gas to the normal range, the engine exhaust emission detection light will turn on, and the ECU will turn on and off if it is judged to be a temporary fault.

Generally, the engine failure is prone to occur in the following situations, and the light is not on when it is not on

1. When the cold car starts, due to the low engine temperature, the gasoline atomization effect is not good, and the combustion effect is poor.

2. It is also easier to appear in winter, but generally don't care. Within 5-10 days of the start, the engine fault light will turn on and off, and the phenomenon will disappear when the water temperature is normal.

3. If the phenomenon does not disappear, but becomes solid, it may be due to the low concentration of gasoline in the cylinder caused by carbon deposition and oil absorption.

Hello friend, your fault light sometimes turns on, sometimes it doesn't. This may be caused by poor contact of your circuit, or a problem with the sensor. You need to use a diagnostic computer to troubleshoot the specific fault**What is it?

Then repair the sensor or replace the sensor according to the fault**, you can solve this problem, first use the computer to detect it.

Question: What is the problem of the failure of the pillow sensor and the sometimes on.

When the throttle is wide, it lights up.

Words to answer this situation. It is possible that the quality of the fuel you use is not good, which causes the detonation in the cylinder to be severe, so the detonation sensor fault light is lit. It is recommended that you try it out with this 95 gasoline.

The question is not a question of wearing a sensor, not a question of wearing a sensor.

Neither can the ninety-five.

Then you just swipe your computer program. Upgrade your PC version, and then do an upgrade in terms of fuel, and see if you can solve this problem?

Ask if it will hurt the engine.

Ask how to upgrade.

The engine failure light sometimes turns on and sometimes goes off for the following reasons:

1. The quality of oil products is high. The engine's fault light is sometimes on and off, which may be related to the substandard quality of the oil used. For example, the engine cannot work normally in time due to unqualified fuel, or the lubricating grease is too thick or too thin, resulting in insufficient lubrication of the engine.

2. A certain part or sensor of the car is on the verge of damage, and there will also be a fault lamp that sometimes turns on and sometimes goes off: the component or the Qiling lifting sensor is good and bad, and the fault lamp will be turned on when it is damaged, and the fault lamp will go out again after a good period of time, and the sensor and the computer will be interrupted for an accident or a period of time, and the computer will also think that it is a fault and light up the fault lamp, but then the communication will be restored, and the fault lamp will automatically go out after a few ignitions.

3. Poor air intake. If the vehicle's air filter has not been replaced or cleaned for a long time, there may be a blockage of the intake air. When the vehicle needs to accelerate due to the lack of intake, the fault light of the engine will also be lit up, but when it is working at low speed, the fault light will often go out again.

Possible causes of car engine failure lights on:

1, the vehicle fault light is generally caused by the fuel emission system, you start and extinguish the vehicle when the fault light is on, and after starting the vehicle three times, you observe whether the fault light is still lit, or it is still lit, you need to go to the store in time to check the fault code, to see whether it is an engine problem or a sensor failure, or it may be an occasional failure can not be checked in time.

2. When the computer receives the parameters of the oxygen sensor, the exhaust emissions seriously exceed the national legal standards, and the internal program of the computer cannot be corrected to the standard range, at this time, the engine control computer will issue a warning light (yellow pollution lamp on) through the instrument to remind the owner to the maintenance station to check the cause of the engine pollution emission lamp.

The automobile engine is the machine that provides power for the car, and it is the heart of the car, which affects the power, economy and environmental protection of the car. According to different power**, automobile engines can be divided into diesel engines, gasoline engines, electric vehicle motors, and hybrids.

Common gasoline engines and diesel engines belong to reciprocating piston internal combustion engines, which convert the chemical energy of the fuel into the mechanical energy of the piston movement and output power to the outside world. The gasoline engine has high speed, small quality, low noise, easy starting, and low manufacturing cost; The diesel engine has a large compression ratio, high thermal efficiency, and better economic performance and emission performance than the gasoline engine.

In addition to the use of gasoline and diesel, vehicles that use other new energy sources are called new energy cavity dispersed source vehicles, including pure electric vehicles, hybrid electric vehicles, fuel cell vehicles, gas vehicles, bioethanol biodiesel vehicles, and hydrogen-powered vehicles. Most of the new energy vehicles on sale in the Chinese market are hybrid vehicles, but at present, pure electric vehicles have been taken as the main direction.

If the instrument indicator is not lit, first check the power supply fuse of the dashboard, and replace it if it is blown. Disassemble the dashboard, the lights are generally at the back of the dashboard, replace the lights that are not lit, and generally the individual lights are not lit to indicate that there is no problem with the fuse and wire, the main reasons are as follows

1. The light of the dashboard is damaged, and the light needs to be replaced in time;

2. If the power supply line of the dashboard is broken, there is an open circuit or short circuit, which will also cause the car dashboard to not light up;

3. If the power supply fuse of the car dashboard is broken, there will naturally be no power supply, and the dashboard will not light up.

Precautions in the use of the car dashboard:

1. When the indicator light is on, the odometer should be observed immediately, if the cumulative mileage reaches or exceeds l00,000km, the timing toothed belt must be replaced, otherwise the timing toothed belt may break, so that the engine can not work normally.

2. After replacing the new timing toothed belt, it is necessary to open the rubber plug outside the reset switch on the mileage dial, and press the reset switch inside with a small round rod to extinguish the timing toothed belt indicator.

3. After replacing the new timing toothed belt, remove the odometer and adjust all the readings on the odometer to the 0 position.

Engine failure lights can be divided into three situations:

1。The car cannot be started, which may be caused by the failure of the fuel pump or ignition parts and the game, and you need to directly ask for help;

2.The fault light is on, but there is no abnormality in driving. This may just be a sensor failure that requires a low-to-medium deceleration to a nearby repair shop;

3.The fault light is on, and the vehicle can drive, but there are symptoms such as violent shaking and insufficient acceleration, and you need to wait for rescue.

1. The combustion state is not good.

Poor engine combustion condition is the main reason why the engine failure light is on. In the design of the car, in order to ensure that the engine is in good working condition and ensure the normal working life of the engine, an oxygen sensor is designed and installed on the engine to monitor the combustion state of the engine.

2. The fuel quality is not good.

Many riders who find that the engine fault light is on have a feeling: that is, the engine fault light suddenly turns on after adding a tank of fuel. Because the engine has requirements for the quality index of oil, especially as the requirements for the engine are getting higher and higher in various specifications, the quality index of the oil is also getting higher and higher.

3. The inside of the engine cylinder is not clean and there is carbon deposit.

After a certain period of use, there must be some carbon deposits inside the engine, which itself will lead to changes in the design parameters of the engine, and at the same time, its properties are unstable and heat is accumulated, and these accumulated heat will lead to disorderly ignition of the engine, thereby causing engine detonation. In this case, the engine fault light is also illuminated.