Whats causing this noise?

Thanks and if not replaced soon could it cause more of a problem?

it will throw a code eventually. i would get it confirmed asap. Roy

where exactly is the pcv valve. is there a website i can go to?

It is on the passenger side valve cover. There should be a sticker with a diagram under the hood.

It was the elbow thanks but when I took the hose off the intake I noticed just a little oil, was the elbow causing that or is it something else