Hi, first of all i am sorry my english is not good. I have a Renault Clio II K4J. Everything is fine when the engine is cold. but when it starts to warm up, there is a rattling sound from inside the engine. I think it comes from the top of the engine, where the camshafts are. In the sound recording I made, I started the engine when it was cold. You can hear the sound when it starts to heat up. there is no sound coming into the car in motion. a sound that can only be heard at idle and in the 1000-1750 rpm range. Why do you think this sound is coming?