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What Causes Abnormal Noise During Cold Engine Start?

1 Answers

DiBennett

07/30/25 12:46am

Generally, it is caused by factors such as dirty engine oil, excessive viscosity, or piston knocking. It is recommended to visit a local 4S dealership for inspection and repair. Introduction to Car Engines: A car engine is the device that provides power to the vehicle, serving as the heart of the car. It determines the vehicle's power, fuel efficiency, stability, and environmental performance. Reasons for Warming Up the Engine: The main reason for warming up the engine is that after prolonged parking, the engine oil flows back into the oil pan at the bottom of the engine. Therefore, warming up is essential. The correct method for warming up is to drive off after 30 seconds to one minute of idling, but avoid high-speed driving during this time. Maintain low speeds and keep the engine RPM below 3000-3500, generally around 2000 RPM.

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