The weather is getting cooler and temperature continues to be cold, so warming up car in winter is more and more necessary. But most people have a vague idea of how to warm up a car and how long it takes to warm up a car.
After consulting with technicians at 4S shop, I found that while everyone's answers are different, basically unanimous concept is that the vast majority of vehicles with EFI still require winter heating.
In winter, if car is not hot, it will damage engine and fuel consumption
Some car owners have heard that warm-up phase of car can be omitted due to improvements in technology of current car. To rush to work, a car stopped for night is often started and then turned off. When almost all professionals refer to this driving habit, they think that it consumes both engine and fuel. According to reports, after engine was left overnight, residual pressure of lubricating oil on each friction surface has long since disappeared, and protection of oil film has been lost. Low temperature greatly increases viscosity of lubricating oil. oil, and adhesion and fluidity deteriorate. Therefore, wear of engine of an unheated machine is significant. At same time, after starting engine at a low temperature, if you immediately press accelerator pedal to start car, because temperature is still low, atomization of gasoline is insufficient and it cannot be completely burned, and it is easy to form carbon deposits, which are very energy intensive.
Whether a hot machine is ready depends on water temperature and speed
Many car owners do not have a clear idea of how long car warms up. Someone thinks that it takes from 3 to 5 minutes, and for someone 30 seconds is enough. The technicians at each store did not have a consistent response. The more common concept is that for models currently on market, due to technological improvements, warm-up time can be reduced accordingly compared to older models. The specific warm-up time can refer to two things, one is water temperature and other is engine speed. Generally speaking, if you are idling and warming up car, you first need to get engine RPM back to normal idle. Some German models have a relatively high speed and need to wait around 1000 rpm before starting to move, while other models also have around 800 at idle, which is one of conditions that must be met. Another condition is that instrument panel shows that water temperature has changed, and you can drive with accelerator pedal. Some car owners can wait until water temperature rises to 70-80 degrees Celsius before driving normally, which is also a good choice.
Vehicle can idle after warming up a little in place
In regards to warming up car at idle after a cold start, there is still debate about whether to use warm-up-in-place or slow idle method.
Some technicians believe that heating in place and slow walking at idle are part of heating process. The on-site warm-up process of car should not be canceled, and specific time should be at least 30 seconds so that operation of oil pump can transport oil to piston, connecting rod, crankshaft and other parts of engine. engine that needs lubrication most. After that, car can be started. However, at a short distance of two to three hundred meters, only starting owner should not increase gas pedal. The general operation is to wait until temperature and speed of water reaches standard as above, and then step on the gas pedal.