Morning after the car, idle state waiting for 3-5 minutes, and so the water temperature up, the hot car to complete, drove away. It is really wrong. The above hot car approach, suitable for the old carburetor engine, because the carburetor engine technical limitations, and when the oil quality is not so good, in order to make the engine to achieve the best conditions only need a hot car. And now the engine Sensor are basically EFI, and the engine processing technology and oil performance have been greatly improved, this hot car approach has long been outdated. For EFI engines, this hot car approach not only does not apply, but also a great harm to the engine.
Idling hot car, the engine temperature will be slower cool car state, and the cool car state will exacerbate the engine wear and tear, to know the engine 70% of the wear and tear are in the start of the moment (cool car) produced, foot Can see the state of the car under the car will wear more powerful. In the idle hot car process, in order to increase the engine temperature as soon as possible, ECU will increase the fuel injection, but this part of the fuel is not completely burned, not completely burn this part will become carbon deposition, residual in the throttle, cylinder wall, Spark plugs and so on. Idle state, the engine fuel injection increases, while the idle state Suction Control Valve to keep the longer, will be more expensive oil. Moreover, the incomplete combustion of fuel, not only a waste of fuel, increase carbon deposition, but also a large number of nitrogen oxides, polluting the environment is not environmentally friendly.
EFI engine should be a car, adjust the seat, the seat belt, driving away. Yes, it can be said that the current car EFI engine does not need the original hot car, or can be understood as 'traffic warm-up', but still need to pay attention: after the car, you need to wait until the engine speed down and become stable, Driving, or there will be a clear sense of frustration. This process will be almost 30 seconds -1 minutes, some car time will be shorter. After the start of the vehicle, at the beginning to try to avoid rapid acceleration, high speed, because after all, the engine temperature has not come up, but also to avoid the engine wear.
'Travel warm-up' refers to the way the vehicle is moving, allowing the lubrication system and the cooling system to move on their own. After the start of the vehicle, the speed is not too much restrictions, the normal driving like, but this time the engine has not yet reached the standard working temperature, to try to avoid rapid acceleration, high speed, this process is actually 35 minutes. Winter weather is cold, do not need the original hot car engine processing technology is no longer than before, and the oil performance has also been significantly improved, so do not need the original hot car, 'traffic warm' or the same applies. Just take into account the winter car is too cold need to warm the wind, you can properly extend the idling time. Winter in order to improve the engine temperature as soon as possible can not throttle. Boom throttle means high speed, cool car state will exacerbate Fuel Rail Pressure Sensor the engine wear, but also on the engine carbon deposition, fuel consumption, exhaust emissions will also be affected. Long time parked vehicles, most of the oil back to the oil pan, and in the car just after some engines because of lack of lubrication may also appear valve 'da da' sound, this situation can be slightly extended idle heat Car time, ranging from tens of seconds to 1 minute.
Nor is all the EFI engines do not need the original hot car, but most of them. Although the overall engine technology has been greatly improved, but different car manufacturers will still have some differences in the engine, so in fact there is still a small part of the car manufacturers are asking for hot cars, which can refer to their own models of user manual. Carburetor engines require long hot cars, in addition to engine wear, there is a particularly important reason is: oxygen sensor. Oxygen sensor is the role of feedback to the ECU to adjust the air-fuel ratio, coordinate the engine work, but its Temperature Sensor operating temperature at about 300 ℃, in order to allow its normal work, only through idle heating. However, the current EFI engine, in the oxygen sensor equipped with a heating wire, can be heated in 3 minutes to 300 ℃, so the dependence on the idling hot car is also getting weaker.