The car cleaned the throttle and changed the piston. Why is it louder?

Hello, dirty throttle is not directly related to loud engine noise. To solve the noise, we need to determine where the faulty parts caused by the noise are, and we can't blindly replace them in specific maintenance. It is recommended to go to a professional 4S shop to find a professional test driver or technical manager and other authoritative people for diagnosis and maintenance. I hope I can help you. If you have any car problems, please ask the car mechanic. If you are not sure, please log in to the car master to find me!