Video of my 5.4L with Loud buzzing -- not alternator or vacuum

[ls1chevelle]

had you read the previous post by the OP before you replied you would have read that he solved the problem by replacing the pvc valve and grommet.

his problem was not with the PS pump

So what's your point?
Well excuse me for taking a wag at it.. I didn't have the time to read through two pages of other people's guesses. I was only trying to be helpful.

 

[Erich Zeppelin]

Good God Almighty! That's some awful scary noise! I couldn't find my noise, bought a stethoscope and found it to be the alternator, bought a brand new one for $147 and am going to replace it this weekend........

 

[HarveyCat]

So what's your point?

I am the OP -- and yes, Expedition is still running well after 5,000 more miles -- no problems after this fix! Was the PCV! The $2 funnel works great to find where the sound is coming from.