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Loud hooting, screaming noise all the time, idle or fast

Tiny
KAYMACKSIMMONS
  • MEMBER
  • 2005 FORD EXPEDITION
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
This noise is all the time loud and has a wierd smell
Monday, March 30th, 2015 AT 7:43 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Check the accessory belt under the hood. It sounds loose. Chances are the tensioner is bad.
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Monday, March 30th, 2015 AT 9:03 AM
Tiny
KAYMACKSIMMONS
  • MEMBER
  • 2 POSTS
Changed belt that made no difference. Sounds like it is coming from the back of the engine. I was told by a diesel mechanic that it was the hooter valve. What is that?
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Monday, March 30th, 2015 AT 9:47 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
I hate to say it, but yes, it is an actual part. It is the crankcase vent valve. See the pic attached.
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Monday, March 30th, 2015 AT 7:36 PM

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