Abnormal noise of Highlander 2.7 engine

The car ran 35,000 kilometers. When it started in the morning, bang, about 2 seconds. It was heard after it hit the car. It's loud. After the car got hot, the sound dropped, but it was still there. After starting, there is a noise of the valve, and it is scraping. Is it time for an overhaul? The car ran 35,000 kilometers. When it started in the morning, bang, about 2 seconds. It was heard after it hit the car. It's loud. After the car got hot, the sound dropped, but it was still there. After starting, there is a noise of the valve, and it is scraping. Is it time for an overhaul? Engine abnormal noise can be roughly divided into engine abnormal noise at cold start, engine abnormal noise at rapid acceleration and engine abnormal noise at idle speed. 1, abnormal noise caused by aging or loosening of machine foot pads. Machine foot pads, also known as chicken feet pads and machine feet, are generally installed between the engine and the car body, connecting the car body and the engine and playing the role of fixing the engine. And its most important function is to play the role of cushioning and shock absorption. Once the machine pad is aged or loose, the engine will shake violently. It was never a problem. Don't be a slut. Practice courage with me through the mobile phone. Come to Jinzhou if you dare, and I will treat you well. Yes, do you drink? I can't give you an accurate judgment because I can't see your real car. I suggest you drive to the dealership and ask the staff in the store to help you. Did you pee? Do you have a car? Check 1. What's wrong with the chain? 2. Clean the lower throttle. It is recommended to open the engine cover when starting, observe what the problem is, or find a professional 4S shop master to check. Is the cold car mine, too? Ask the same question! ? Does your car have this sound? Record the sound of the chain. Check camshaft and top valve. Pay attention to check and repair the engine quickly. No small matter. @20 19