Hi, my name is Tim and I just joined this forum on the Ford Focus. I love my 05 ZX4 ST that I just bought, but it seems to have an annoying engine noise that I would really like to take care of quickly. I suspect the timing chain and associated components and would like to know if anybody could confirm what's going on. At around 25 to 2800 rpm the engine makes a very noticeable knocking sound at neutral throttle. If I am accelerating or decelerating there is no noise, but again if I am just rolling down the highway at partial throttle, just enough to maintain my speed, the noise is there. The car currently has 125K on the odometer and is generally in very good shape. This is a really fun car that I would like to hold onto and I would appreciate any advice from the experienced owners out there. Thank you.