What's with the loud engine of Buick LaCrosse?

The reason for the loud noise of Buick LaCrosse engine may be: 1, the engine fulcrum is aging. If the driving distance is long, the feet of the engine will age, and replacing the feet of the engine can solve the problem. If carbon deposits, the sound of the engine will also become louder. 2. If the owner listens to the engine running outside, the sound will be loud when getting on the bus, and the sound insulation effect of the car will be better. Check whether the sealing strip of the vehicle is aging. Or improve the sealing effect of the vehicle, try noise. When the mileage increases, the engine sound will be normal, so the owner need not worry too much, and need to pay more attention to the maintenance of the vehicle; 3. When the engine starts, if it makes a dull sound like knocking, it may be that there is something wrong with the cylinder valve. In this case, if you drive fast, the sound will disappear when you drive fast. The reason with high probability is the problem of gas cylinder valve. In addition, please check the hydraulic pressure to eliminate hydraulic problems. 4. After the engine is started, abnormal noise occurs at idle speed. The fault point is probably the internal hydraulic pressure of the engine cylinder head and the valve clearance is too large. It may be because of the long service life of vehicles with many kilometers, and the engine valve and hydraulic pressure will lengthen and wear. When the gap is too large, it will make a "shaking" noise. To solve this problem, it is necessary to remove the cover and replace these two parts.