What Are the Eight Common Engine Faults?

[EliasRose]

Here is an introduction to the eight common engine faults: 1. Engine cold start shaking: The engine shakes during cold start idling but returns to normal after warming up. The main reason is excessive carbon deposits inside the engine. During cold starts, the fuel injected by the injectors is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture and causing difficulty in starting. 2. Engine hot start shaking: The engine shakes during hot idle. There are many reasons for hot idle shaking, the most common being engine misfire. Generally, check the spark plugs, ignition coils, fuel injectors and fuel lines, and whether the exhaust is blocked. 3. Engine abnormal noise: Engine abnormal noise is divided into cold start noise and hot start noise. Cold start noise is mostly caused by the oil flowing back to the oil pan after the car has been parked for a long time. During cold starts, the oil pump cannot immediately establish oil pressure to form an oil film, and the parts are not lubricated, causing noise. 4. Engine carbon deposits: Carbon deposits are mainly formed due to incomplete combustion during engine operation, along with the gummy substances produced by impurities in fuel and oil during combustion, which accumulate over time. Carbon deposits can cause cold start engine shaking, idle engine shaking, and reduced power. 5. Throttle frequently dirty: The main reason for a dirty throttle with carbon deposits is the reciprocating airflow during the engine's intake and exhaust strokes. Not only does it draw in air during intake, but also gas reflux into the intake manifold during valve overlap, leading to carbon deposit formation. The solution is simple: clean the throttle. 6. Engine burning oil: The reasons for burning oil are usually incorrect oil grade, aging or damage to the valve oil seal, piston ring sealing failure causing oil leakage, damage to the oil separator or crankcase ventilation, or cooling and lubrication issues at the turbocharger. 7. Engine oil leakage: Engine oil leakage is mostly caused by aging sealing gaskets. Common leakage areas include aging or damaged oil pan gaskets, loose oil drain plugs, etc. 8. Engine overheating: Engine overheating is mainly manifested as an engine temperature warning or boiling. The causes of overheating are often due to a faulty thermostat losing its ability to regulate the cooling cycle, a dirty radiator reducing cooling efficiency, insufficient coolant, or air trapped in the cooling system.