well, is that the noise from the timing chain or the pistons scraping the cylinder walls? It sounds quite bad.
more info of the engine : 96K miles, burns oil in a cold start, and have valve ticking noise.
It does not make any knocking noise or any other noise on startup, which I relieve. However, it burns oil on startup in winter and high pitched? whistling noise when idling from the left front side of the car.I think I hear the irregular clacking sound you're asking about. If you're positive it isn't coming from any of the accessories then there's not much way to know without tearing the engine down or waiting for it to come apart on its own. I could agree with you on it sounding like a timing chain.
Does it make any bad noises on startup?