Winter is always cold especially in high latitude areas. When vehicles are parked for overnight in low temperature, “warm-up” at idling speed is necessary before they are restarted. It is suggested not to drive vehicles on road before the water gauge passes 60℃. However, different opinions from internet believe that it is not necessary to warm up in cold start at all. Whom on earth shall we follow then?
Professionals give a conclusion that
warm-up is necessary but never over acted,
and in the meanwhile,
it should follow the proper ways.
Improper warm-up will bring about adverse effects
I. Long time warm-up will accumulate carbon deposit
Engine coolant will be in very low temperature when vehicles stop in cold winter. The temperature sensor of the coolant will transfer the temperature signal to ECU as a reference for increasing fuel injection in cold start. When vehicles warm up at idling speed, the air volume intake is quite small, and then the engine in cold state requires more fuel volume injection to keep on running and heat the three-way catalyst. In this case, when vehicles start from cold state at idling speed, the mixture will be over-concentrated. Warming up vehicles at idling speed for long without increasing engine speed to heat up quickly, the over concentrated mixture will not be able to burn completely in the combustion room accumulating lots of carbon deposit in the combustion room and around the valves.
II.Exhaust pollution from cold idling is serious
From the context above, long idling after cold start will leave the engine working in the condition of mixture over concentrated in long term, which gives rise to the high pollutent content in the exhaust. When vehicles start from cold state, engines will heat up gradually, assisting three-way catalysts to raise the temperature to normal working state. If the engine runs at idling speed all the way, the temperature of three-way catalyst will be raised too slow to dispose the pollutant in the exhaust effectively. Some friends even prefer to have a smoke nearby the vehicles which are idling to warm up, in which case, they are actually taking in the pollutents of the exhaust.
III.Waste of fuel
Fuel injection will increase when engine runs from cold state, which for sure wastes plenty of fuel. In most cases, vehicles are always parked in residential areas, garages or roadsides, away from main road. On account of this, it is better to drive the vehicles slowly to the main road and accelerate to normal speed rather than idling in-situ wasting of fuel. In this way, vehicles can be warmed up without wasting your time in the morning and in the meanwhile avoiding fuel waste.
Recommended way of starts and warm-ups
Step one: connect the power and wait for a while
Turn the key (or press the button) to the position where the power is on, and wait for about 30 seconds. After power on, each control unit will finish self-inspection, and fuel pumps in the meanwhile work to transmit the fuel in the tank to the engine, recovering the pressure in the fuel system. Without this process, if the engine is started directly in the cold state, then the first start is usually tardy because the fuel is not in place yet.
Step two: start the engine and idle for a moment
The engine oil will be almost all back to the oil sump after the vehicle parks overnight. When the vehicle restarts, the oil pump will work to transport the oil to each individual part of the engine again, which takes a process. We do not need to worry about how long this process will take, just move the vehicle after the engine runs for 30 seconds (increase the engine load), when all the moving parts of the engine have been lubricated by oil to be free of severe wear and tear effectively.
Step three: drive slowly at low speed to heat up the engine
After the vehicle starts from cold state, let the engine run idling for 30 seconds, and then the idling speed will slow down than when it starts. As soon as the engine speed slows down and gets stable, it is time to gear forward and move. But at this moment, the engine temperature is still very low, therefore it is better not accelerate the engine speed, but driving the vehicle for a while at 2000R per minute. Do not accelerate to speed up until the water temperature gauge moves to show the engine temperature passes 60℃.
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