What are the reasons for difficult cold starts in car engines?
2 Answers
Car engine cold start difficulties are caused by fuel injector failure. The fuel injector itself is a normally closed valve. When the electromagnetic coil is energized, it generates suction force, lifting the needle valve to open the injection hole. Fuel is sprayed at high speed through the annular gap between the needle valve head and the injection hole, forming a mist that facilitates complete combustion. An engine is a machine capable of converting other forms of energy into mechanical energy, originating in the UK. It can refer to both the power generation device and the entire machine including the power unit (such as gasoline engines, aircraft engines). Types include internal combustion engines (e.g., gasoline engines), external combustion engines (e.g., Stirling engines, steam engines), and electric motors.
Over my years of driving, I've encountered cold start difficulties several times, and there are actually quite a few reasons for this. The most common issue is an aging battery - its power drops rapidly in cold winter weather, making the engine cranking weak. If spark plugs have too much carbon buildup, the ignition becomes weaker, especially if they haven't been replaced for a long time. Engine oil that's too thick creates greater resistance at low temperatures, making rotation difficult. There could also be fuel system blockages, with injectors not spraying fuel or fuel pump malfunctions. Faulty ignition coils or short circuits in wiring might also cause trouble. Slow engine starts are normal in low temperatures especially after prolonged parking, but if this happens frequently, it's best to get it checked at a repair shop. Don't wait until you're stranded on the road - that would be too troublesome for work. Regular maintenance is most important.
