intermittent buzzing/humming noise

[chrisluke50]

Has anyone every noticed their Expedition making a buzzing or humming noise every once in a while? It seems to be coming from the passenger side of the engine somewhere. I almost want to say it's a noisie fuel injector but not sure. I notice it most at cold start ups. Usually doesn't last, but the noise is driving me crazy.

00 Expo XLT 5.4

 

[chrisluke50]

After research: PCV Valve. Will update to see if this fixes it.

 

[Mediamonkey11]

Yes, pcv valve. Been there, replaced it, no more buzzing.