Oil pump failure, engine filter and oil filter blockage will lead to low oil pressure, which will cause the oil pressure light to alarm.
When the oil pump fails, it should be noted that the oil pump failure will lead to the interruption of oil supply on the moving surface of engine components, resulting in dry friction of components, serious engine wear, engine smoke, jitter and so on. Causes irreversible and serious damage to the engine.
Check whether the oil quality causes blockage and other factors.
First of all, the engine will produce sludge, which is a big impurity.
However, too much sludge is easy to block the oil pump filter screen of the oil pan, resulting in too low oil pressure, which makes the oil pressure lamp alarm.
In addition, too much sludge may deteriorate the engine oil, resulting in too high viscosity of the engine oil, and may also make the engine oil pressure light alarm.
Check whether there is a problem with the oil suction plug, resulting in a false alarm.
The oil sensing plug is used to detect the oil supply pressure of the engine. There is something wrong with the plug of the oil sensor, even if there is no shortage of oil, the pressure can not be detected. The oil pressure lamp gives an alarm, so that the oil level lamp of the instrument is always on.
Master Jinglan checked it slightly and found that there was something wrong with the oil filter. By replacing the new oil filter, the problem of oil level lamp is directly solved.
The difference between the old and new fuel tanks is 0.5 cm.
Related question and answer: What is the problem when the oil lamp of the car is on when there is no shortage of oil? What should I do?
Fault false alarm
The so-called fault false alarm mainly refers to the failure of the oil sensor plug, which is the sensor used to detect the oil pressure.
If there is a problem with the plug of the oil sensor, if the control unit does not detect the pressure signal, the oil pressure warning light will light up. Even if there is no shortage of oil, the oil lamp in the trace will still light up. To be honest, considering the harsh working environment of the oil sensor plug, it is not uncommon for the oil lamp to light up due to the failure of the oil sensor plug.
The oil sensor plug can generally be found in the main oil passage on the side of the engine, which is an important component to judge whether the engine lubrication system works well. If it fails, the automobile ECU can't detect the oil pressure signal, and the oil light is on. The oil sensor plug may have many failure forms, such as looseness and oil leakage.
Internal combustion engine deposit
It is hard to imagine that engine sludge is sometimes related to the lighting of oil lamps. In fact, it is well understood that the large impurities formed by engine sludge are easy to block the oil pump filter screen (filter screen) of the oil pan, resulting in low oil pressure; Second, engine sludge can easily deteriorate engine oil or change its viscosity. If the oil viscosity is too high, it may also cause the oil lamp to give an alarm.
The sludge in the engine may be produced in high or low temperature environment, which has a certain relationship with the driver's usual driving habits. Frequent short-distance car use, frequent start-up, cold weather without hot car, frequent flameout, poor maintenance, etc. It is easy to breed sludge inside the engine. However, there are many hail potatoes in the engine sludge, especially some old cars, which are more likely to cause the oil pressure light to alarm because of the sludge.
In fact, the serious sludge inside the engine is more harmful to the engine than carbon deposition. In addition to the obvious decline in engine performance, engine noise and fuel consumption, sludge is also easy to cause irreparable wear and tear to the engine. Therefore, when there is a large amount of oil sludge in the engine, the interior of the engine should be deeply cleaned.
Oil pump failure
The failure of the oil pump is similar to the blockage of the engine filter and the oil filter, which will cause the oil pressure to be too low and make the oil pressure light give an alarm. The oil pump is generally driven by the driving gear of the camshaft to increase the oil pressure and ensure the full lubrication of the internal components of the engine.
When the oil pump fails, it is easy to prevent the oil from being supplied to the top of the engine, resulting in dry friction and serious wear of the upper parts, and even the engine smokes and shakes. If the oil pump fails, once the oil pump loses pressure, it may cause irreversible serious damage to the engine. So once the oil lamp is on, we must find out the reason.