In the morning i start the car at 5am after overnight and there is a noiseon the right side under the hood, for 2-3minutes. At 4pm i go back to my car and the same thing happens. The enigma here is that that noise is there for 4 days and then it disappears for 4 days, then the same thing happens; the hole cycle. I changed the enginechaines, shoes, extensions for the chains, lifts and the hole pack and the cover for the oil pump were changed. Sorry if some car pieces are under a wrong name. Somebody can resole this brain puzzle. Thank you.