What Causes Engine Power Loss After Overheating?
2 Answers
Causes of engine power loss after overheating: 1. Thermostat fails to open, preventing coolant from circulating through the main loop; 2. Radiator or engine water jacket blockage, disrupting normal coolant circulation; 3. Corroded water pump impeller resulting in insufficient pumping pressure; 4. Bent or deformed radiator fins or foreign object blockage, reducing heat dissipation efficiency; 5. Severe leakage leading to insufficient coolant; 6. Delayed engine ignition timing; 7. Loose water pump belt; 8. Electric fan malfunction or slow rotation speed. Below are engine maintenance methods: 1. Regular cleaning of the automobile crankshaft case: During engine operation, high-pressure unburned gases, sulfur, moisture, nitrogen oxides, and acids from the combustion chamber enter the crankshaft case through piston ring-cylinder wall gaps, mixing with metal particles from long-term component wear to form sludge. Therefore, periodic crankshaft case cleaning is essential to maintain engine cleanliness. 2. Regular cleaning of the automobile fuel system: Engine maintenance must include fuel system care. Periodic fuel system cleaning controls carbon deposit formation, keeping the engine in optimal condition.
I noticed that the engine becomes sluggish when it overheats, and there are usually several reasons for this. One is an oil issue. When the engine temperature gets too high, the oil becomes thinner, reducing its lubrication effectiveness. This increases friction between the pistons and cylinder walls, making the engine harder to turn and naturally decreasing power output. Another reason is thermal deformation of the piston rings, which compromises their sealing ability. This leads to insufficient cylinder compression pressure and incomplete fuel combustion, causing the engine to lose power. Some vehicles may also experience stuck valve stems, preventing the valves from opening and closing properly, which directly affects intake and exhaust efficiency. Prolonged overheating can more easily burn out the head gasket, mixing coolant with engine oil and causing abnormal engine operation—resulting in a weak-performing car. If the radiator is clogged or there's insufficient coolant, it can trigger a chain reaction. It's advisable to promptly inspect the cooling system to prevent further deterioration.
