What Causes Abnormal Noise in a New Car's Engine?
2 Answers
Abnormal noise in a new car's engine is usually caused by sounds from the valves or fuel injectors during post-warranty inspections, and the carbon canister solenoid valve may also produce similar noises. Generally, the engine noise during a cold start is louder than when the engine is warm, which might result in abnormal sounds. This is mainly because the engine is cold, and the gap between the cylinder walls and pistons has not yet reached the optimal size, coupled with insufficient lubrication from the engine oil. Typically, these noises disappear once the engine reaches normal operating temperature. Replacing the Oil Filter: When the added engine oil is impure or contains contaminants, the engine may experience varying degrees of wear during operation. The oil filter helps purify the oil by trapping airborne particles. Over time, it needs to be replaced promptly to prevent the oil filter from becoming ineffective. 3. Regularly Changing the Coolant: The engine coolant primarily serves to regulate the engine's temperature. While driving, it's essential to regularly check the coolant level and top it up if it's low. This prevents the engine from overheating during operation, ensuring smooth engine performance.
As someone who frequently tinkers with engines, I find it quite common for new car engines to develop abnormal noises, primarily due to assembly or component issues. For instance, loose screws or brackets can cause rattling when the car moves; belts that are too loose or too tight produce annoying squeaks; or defective hydraulic lifters may create clattering sounds when lubrication is insufficient. I've seen many cases in the workshop where poor-quality oil during the break-in period of a new car can cause abnormal friction, leading to noise. Don't underestimate this issue—promptly return to the dealership for inspection, as repairs are free under warranty, saving you from costly major repairs later. While driving, always pay attention to dashboard warning lights, and during regular maintenance, technicians can help check and tighten mounting points to reduce potential risks. In summary, based on my experience, these factors combined can cause abnormal engine sounds.
