What is the reason that the car engine fault light is on, the engine is turned off, and the restart

Reasons for the engine failure light: 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. a spark plug.

Fault, ignition coil.

Fault; 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 and crankshaft.

Position, air flow, intake air temperature, oxygen sensors, etc., when these sensors are damaged, poor contact or signal interruption, the ECU of the car cannot accurately obtain engine data, and the engine failure light will be 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 in the air, and in the process the air cleaner is required.

It is very important, if the air filter 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 in the long run, and in serious cases, it will cause the engine failure light to turn on. pressurization issues; Intake booster lines, turbochargers.

It will also cause the engine failure light 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 camshafts.

and bearings. 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 failure light came on and went off again after restarting because there was too much carbon buildup inside the throttle. Whether the car accelerates flexibly or not has a lot to do with the dirt of the throttle, which can reduce fuel consumption and make the engine flexible and powerful.

It may be caused by poor circuit contact, first the circuit is broken, and then the car jitters, and the line is reconnected and returned to normal.

Generally, when the fault light is on, the car occasionally can't be refueled, and the engine is shaking. First check if the brake light switch and rear brake bulb are broken. If nothing is a problem, the engine throttle valve is faulty and the throttle valve needs to be cleaned or replaced.

You can check the circuit first to see if there is any bad contact.

This is normal.

Engine failure lights.

It is normal to turn on and turn off after starting. When the key is opened normally, the inner engine fault lamp, oil lamp, and battery lamp are all on, and they are all extinguished after starting the car, and the instrument is not lit when the car is moving. There are too many possible reasons for the engine failure light to turn on, and they can be roughly divided into the following three categories:

1. False failure. Report the fault**, but the work is normal, it may be that a certain operation is beyond the control of the computer, and the fault of the computer feedback can be eliminated first, and then see if the fault code is still jumped.

2. Minor faults. There is no particularly obvious fault in the engine, according to the computer detection information and further inspection, it is found that there is really some kind of fault, which does not affect normal driving or has little impact, and needs to be found and solved in time. For example, the inlet pressure sensor is faulty, etc.

3. Major failures. Such faults are noticeable to the naked eye and driving sensations, and seriously affect the normal operation of the engine, requiring immediate repair. For example, the engine is obviously underpowered, and it is likely that the oxygen sensor is a problem.

When we turn on the power supply on the car, but it has not been officially started, all kinds of fault indicators on the car, including the engine, water temperature, battery, airbag, etc., will be lit at the same time, and when the vehicle starts, these lights will automatically go out, and this is the vehicle's self-detection function is running, which is a normal phenomenon.

The purpose of the vehicle's self-detection function is to let the driver know that the information inside the vehicle changes and be prepared. In this way, some accidents caused by vehicle problems can be avoided. Therefore, it is normal for the engine light to turn on and off.

The engine indicator is used to show the working condition of the vehicle engine, when the key door is opened, the vehicle self-test, the indicator light is lit and automatically extinguished, if it is always on, it means that the engine of the vehicle has a mechanical failure and needs to be repaired.

There are several possibilities for this, for example, the signal is interfered by somewhere in the car, and the water temperature is normal after a while when the car is faulty, it is recommended to go to the 4S store to check, they can read the background fault code more professionally.

Hello, if this is the kind of problem, it is recommended to call the master to check whether there is any fault, if not, ask the master to clear the computer data.

Under normal circumstances, the engine has a self-inspection process, and some faults do not appear again after 1 time, and the fault return light will be extinguished.

In addition, there are some fault lights that will definitely turn on when they are not started, such as oil pressure, battery charging prompts, etc., which will naturally disappear as soon as the engine starts.

If this is often the case, it is recommended to check it, as long as it can be normal, it is not a big problem, maybe you only need to eliminate the fault code.

Hello, I suggest you use the computer to test it, I hope my answer can help you, I wish you a happy car!! [If you have a problem with the car, ask the car master.] 4S shop professional technician, 10 minutes to solve. 】

It may only be a problem with the sensor Domestic cars are more prone to this kind of problem.

1. If the car does not start the ignition, but only turns on the imitation power supply, then the fault light of the engine lights up and then goes off, and at the same time, the water temperature indicator light, battery light, and safety gas bag light of the car will also be lit up and then extinguished, which may be the self-inspection link of the vehicle, not the engine has a problem.

2. The fault light of the engine is on, it may be that the sensor is detecting the emission of the exhaust gas of the car, if the exhaust gas of the car exceeds the standard, the engine fault light will be lit up, and the fault light will be extinguished by itself after the fault light is lit, and the owner does not need to worry too much.

3. If the vehicle is rolled up after starting and the fuel atomization inside the engine cylinder is poor, it will also cause the engine fault light to turn on, and when the temperature of the car rises, the engine will work normally, and the engine fault light will go out.

Car engines.

The engine failure light is on, and the restart is off again because of the throttle.

Internal carbon deposits.

Plethora. Whether the car accelerates flexibly has a lot to do with the dirt of the throttle, the throttle cleaning can reduce fuel consumption and make the engine flexible and strong, and if the throttle deposition is too much, there is too much dirty sludge The phenomenon will cause the engine to accelerate poorly, and the fuel consumption will increase, which will lead to the engine failure light to shine. If there is no clogging of sludge, if the throttle valve remains open, then the air intake will be too large, and the result will be that the engine shakes when starting, and acceleration is weak, and the engine fault light will also be lit.

The throttle valve is a controllable valve that controls the entry of air into the engine, and after the gas enters the intake pipe, it will mix with gasoline to become a combustible mixture, thereby combusting to form work.

It is connected to an air filter.

It is connected to the engine block and is said to be the throat of the automobile engine. The throttle four-stroke gasoline engine is roughly like this. The throttle valve is one of the most important components of the EFI engine system today, its upper part is the air filter air grid, and the lower part is the engine block, which is the throat of the automobile engine.

Engine indicator refers to the indicator light used to show the working condition of the vehicle's engine. The engine fault light is used to show the working condition of the vehicle engine, when the key door is opened, the vehicle self-test, the indicator light is lit and automatically extinguished, if it is always on, it means that the engine of the vehicle has a mechanical failure and needs to be repaired.

It is recommended to use the car computer detector to test the engine system, read the fault code, and then analyze and judge the maintenance according to the detected fault content.

The main reason why the engine fault light is on is that there is too much carbon deposit inside the throttle or engine, and you are more likely to have dirty throttle if you idle unsteadily. After the failure of the oxygen sensor, the mixture is out of balance, and the engine fault light is easy to turn on; 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.

You can start with these aspects.

According to your description. If this phenomenon occurs only once, it is an occasional failure. It is recommended to connect a fault diagnosticator to face the lowest fault diagnosis of the engine system to determine if there is a fault? Hope, thank you.

1. Identify the cause of the failure. For diagnostics of such faults in which the engine does not start, the battery should be tested first. It is necessary to find out if the engine does not start because the battery is insufficient.

2. Detect ignition timing. Timing belt slippage is the root cause of the failure that there is no electric spark and the engine cannot start.

3. Detect the starting system. In the case of faults such as engine failure to start, the first thing to do is to check the circuitry in the engine starting system. From the perspective of the most basic composition, the circuit of the starting system generally includes the following basic parts, that is, the battery, the starting motor and the cable connecting these parts.

Of course, in addition to this, ignition switches, starter relays or solenoid coils, as well as in-vehicle anti-theft systems, are also important components of the starting system.

4. Detect the quality of electric sparks. Once the circuitry of the starting system has been tested and proven to be fine-tuned, attention should be focused on why the engine is not working. Generally speaking, the ignition system of the engine is tested first, which is also the easiest inspection job.

In early ignition systems, you could easily remove the ignition coil and use a spark detector to detect if the spark was normal. When choosing a spark detector, an adjustable detector is preferable to a fixed design because it allows you to adjust the detector to a smaller gap so you can tell if there is no spark at all, or if there is an electric spark but it is weak.

5. Detect the fuel system. The diagnosis of the fuel system can be divided into two parts: the diagnosis of the fuel supply system and the diagnosis of the injector circuit system.

The fuel supply system can be detected by measuring the flow and pressure of the fuel. The best way to measure fuel flow is to inspect the line when there is a load in the fuel supply line.

Hello, this situation is recommended to be observed, and if it appears, go to the repair shop to test it with a computer.

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Hello, the engine failure light of the vehicle is on, and it returns to normal after turning off and restarting, the relevant reasons are as follows?

First, this situation shows that the fault light of the vehicle engine, which is an occasional failure, after this envelope, the computer can not detect this fault, and the fault code will be automatically cleared.

Second, if this kind of fault is to use a computer to read which sensor of the engine system is faulty? If there is a problem with the sensor, it needs to be cleaned or replaced.

Third, the fault performance caused by carbon deposition in the vehicle engine is that it is necessary to clean up the carbon deposition inside the throttle and the vehicle engine.

What is the reason that the car engine fault light is on, the engine is turned off, and the restart is normal?

Dear, this question is up to me, it takes a little time to type, please be patient, thank you!

Hello, dear, car master exclusive technician for your service, attentive, careful, attentive for you to answer the car questions, for you to find the corresponding problem solutions and solutions to the regret, will provide you with a satisfactory answer! I hope this service can help you. I wish you a good year of the tiger and good luck Hello, the engine fault light of the vehicle is lit, and it returns to normal after turning off and restarting, and the relevant reasons are as follows?

First, this situation shows that the fault lamp of the vehicle engine, this is an occasional failure, after this envelope, the computer can not detect this fault, and will automatically clear the second item of the fault code. If there is a problem with the sensor, it needs to be cleaned or replacedThird, the fault performance caused by carbon deposits in the vehicle engine is that the throttle and the carbon deposits inside the vehicle engine need to be cleaned.