What if the engine alarms on the way? Should I call for help from relatives and friends or call for assistance? In fact, there are no more than these two options, but the difference is that the car owner needs to judge whether the car can continue to drive, and can drive to the repair shop if it can drive. If the car owner can’t judge that delaying home will bring economic losses, how about Is it possible to determine whether the engine alarms the car?
1. Air intake
If you want the engine to work normally, you must meet: the throttle opening is normal, the intake air flow sensor (intake pressure sensor) voltage is normal, the pipeline has no air leakage, and the intake is controlled by the flap regardless of the length of the intake port. Road (generally the engine is not easy to appear) wait for these points, the engine will work smoothly. If the throttle opening is abnormal (carbon deposits, dirty), the engine idling speed will rise and fall, but the high speed will not be felt. If the intake air flow sensor (pressure) fails, not only will there be problems with idling speed, but also when the car is turned off and the acceleration is weak, the engine will alarm the first time. As for the problem of the flap, the main manifestation is the inability to accelerate at high speed, and the engine may give an alarm after a hot car cycle. There is air leakage, not to mention, the engine will not alarm immediately when the air leaks, but will alarm when the oxygen sensor is corrected and wait until the correction value is exceeded. It is difficult to check, and there is no clue.
2. Ignition
It's a bit far-fetched to say that, because fuel injectors are also involved. The three components are spark plugs, fuel injectors, and ignition coils. The spark plug generates electric sparks to ignite the combustible mixture. The ignition coil is to generate high-voltage auxiliary spark plug ignition. The fuel injection
What if the engine alarms on the way? Should I call for help from relatives and friends or call for assistance? In fact, there are no more than these two options, but the difference is that the car owner needs to judge whether the car can continue to drive, and can drive to the repair shop if it can drive. If the car owner can’t judge that delaying home will bring economic losses, how about Is it possible to determine whether the engine alarms the car?
1. Air intake
If you want the engine to work normally, you must meet: the throttle opening is normal, the intake air flow sensor (intake pressure sensor) voltage is normal, the pipeline has no air leakage, and the intake is controlled by the flap regardless of the length of the intake port. Road (generally the engine is not easy to appear) wait for these points, the engine will work smoothly. If the throttle opening is abnormal (carbon deposits, dirty), the engine idling speed will rise and fall, but the high speed will not be felt. If the intake air flow sensor (pressure) fails, not only will there be problems with idling speed, but also when the car is turned off and the acceleration is weak, the engine will alarm the first time. As for the problem of the flap, the main manifestation is the inability to accelerate at high speed, and the engine may give an alarm after a hot car cycle. There is air leakage, not to mention, the engine will not alarm immediately when the air leaks, but will alarm when the oxygen sensor is corrected and wait until the correction value is exceeded. It is difficult to check, and there is no clue.
2. Ignition
It's a bit far-fetched to say that, because fuel injectors are also involved. The three components are spark plugs, fuel injectors, and ignition coils. The spark plug generates electric sparks to ignite the combustible mixture. The ignition coil is to generate high-voltage auxiliary spark plug ignition. The fuel injection nozzle injects fuel into the cylinder according to the pulse signal of the control unit. Under normal circumstances, these parts are not prone to problems. The ignition energy of the spark plug becomes weak, and the gap needs to be replaced when the gap is too large, or carbon deposits cause the spark plug to work abnormally and need to be cleaned. In general, fuel injectors rarely suffer from damage and oil leakage. After all, they are precision parts. Most of the problems with ignition coils are aging problems. Compared with the three small parts of the air intake, once there is a problem, it is more direct. The engine directly alarms and then the car starts to lack cylinders and shakes violently.
3. Combustion
Combustion feedback is actually the exhaust problem, which is also an emission problem. The component that directly affects the emission problem is the three-way catalytic converter. At present, everyone knows the environment we live in. The smog is so ignorant that people can't see people. The problem of car exhaust emissions is a big problem. As a driver, we should pay attention to it. Under normal circumstances, the normal operation of the three-way catalytic converter can meet the emission problem, but the cylinder pressure of the engine is not enough, or the engine is pulling the cylinder and the internal seal is not tight (valve, spark ring). The role of the catalytic converter will be minimized, the emissions will not only exceed the standard, but also damage the three yuan. The three-way catalytic converter can convert harmful gases such as CO, carbon monoxide, HC hydrocarbons, and NOx nitrogen oxides discharged from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. Its work is directly related to automobile emissions. , So you need a rear oxygen sensor to monitor its status. Especially during cold start, the working temperature of the three-way catalysis is not reached, and the emission is the highest at this time. To solve this problem, some manufacturers have developed a secondary air pump to assist the three-way catalysis to enter the working state as soon as possible. The oxygen sensor is divided into the front oxygen and the rear oxygen. The front oxygen sensor forms a closed-loop control by cooperating with the air flow, and dynamically controls the fuel injection volume of the engine in real time for the purpose of fuel saving and emission reduction. The probability of failure of the front oxygen is very high, and the detection and troubleshooting are also more complicated.
4. Water temperature
Generally, there is a separate water temperature alarm on the instrument panel, but the water temperature has a great and direct impact on the engine. About 30% of the heat generated by the engine's work will be converted into the temperature of the coolant, which will be dissipated through the radiator. Engine overheating is extremely detrimental to engine combustion. If the coolant temperature is too high, the internal pressure will increase, which will cause boiling and water pipes to burst. When the temperature is too high, the engine oil will become thinner and the engine lubrication will deteriorate. If the coolant does not reach the operating temperature (too low), the engine oil does not reach the normal operating temperature, which will increase abnormal wear or loss, and cause great harm to the engine. Similarly, burning engine oil and poor combustion have a greater impact on exhaust gas. Therefore, the influence of the coolant on the engine is great.
Summarize:There are too many small parts that can cause engine alarms, because the engine light alarm is a relatively wide-ranging reminder, and it cannot be determined alone that it is an engine problem, or even a transmission problem. Of course, the above points are very intuitive, and the direct cause of the engine alarm is easier to understand. At least you can understand why the car owner is listening to the car repairer telling you about the car, and why the engine light is on.
