What Causes Engine Failure in a Car?
3 Answers
The reasons for engine failure in a car are as follows: 1. Sensor-related failures: such as the water temperature sensor, crankshaft sensor, oxygen sensor, etc.; 2. Poor combustion of the air-fuel mixture: issues with the engine's spark plugs, ignition coils, fuel pump, or clogged fuel lines can all lead to poor combustion of the engine's air-fuel mixture. 3. Air intake problems: The engine requires air intake during combustion, and in this process, the air filter is crucial. If the car's air filter is dirty and not cleaned regularly, it can affect the car's air intake. Over time, this can lead to blockages, and in severe cases, it can cause the engine warning light to illuminate. 4. Turbocharging issues: Problems with the intake boost pipes or turbocharger can also trigger the engine warning light. The most common issue is a damaged turbocharger, accompanied by symptoms such as oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust pipe.
There are many causes of engine failures. Having driven for years, I often encounter ignition system issues, such as spark plug carbon buildup or ignition coil burnout, leading to starting difficulties or even stalling. Fuel system malfunctions are also frequent, like an aging fuel pump with insufficient pressure, causing weak acceleration; or clogged injectors with poor atomization, resulting in high fuel consumption and pollution. Sensor failures are critical—a dirty oxygen sensor provides inaccurate readings, disrupting the air-fuel mixture ratio and causing rough idling. Mechanical wear should not be overlooked, such as worn piston rings burning oil and emitting blue smoke. Regular maintenance is essential: inspect components every 10,000 kilometers and replace the oil filter as a preventive measure. When the check engine light comes on, promptly visit a professional shop for an OBD scan to avoid minor issues turning into major repairs. Safety first—if abnormal shaking occurs, pull over immediately.
Experience in dealing with engine failures tells me that the root cause often involves sensor malfunctions, such as a faulty crankshaft position sensor, where the computer fails to receive a signal, leading to startup failure. Ignition component issues are equally common, like excessively large spark plug gaps causing ignition failure. In terms of fuel, clogged injectors and excessive carbon buildup result in poor atomization and unstable idling. Electronic control system failures are particularly sensitive; ECU short circuits or programming errors can lead to control chaos. Cooling system problems, such as water pump leaks or insufficient antifreeze, can cause temperatures to soar beyond 100 degrees, risking cylinder seizure. During diagnosis, plug in an OBD scanner to read fault codes for precise localization. Maintenance recommendations include changing the air filter and engine oil every 5,000 kilometers and cleaning the intake valves. Avoid aggressive throttle inputs during daily driving to prolong engine life. Unusual sounds should be promptly investigated.
