Question about 2004 Ford F150

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Engine Whistle on F150

My 2004 4.6L F150 engine emits a high pitched whistle from under the hood at certain RPMs. This happens only during cold weather (under 20F?) and diminishes somewhat when the truck warms up. My friend with a 5.4L has the exact same problem. This sound is LOUD and very annoying but it doesn't seem to be hurting anything.

Both of these trucks have done this since they were new so I doubt the problem is a cracked hose or broken bolt as many web postings have suggested.

This is not a squeal such as would come from a belt or bearing. It is definitely air passing through something. Possibly cold dense air passing through the throttle body? I can't believe that this has been happening to all these people all these years and no one has come up with a solution! Can you help?

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  • Anonymous Jan 18, 2009

    I and my friend both have 2004 F-150's with exactly the same problem, and the high pitch whistle?whine?, drives us crazy

  • Anonymous Jan 24, 2009

    I Have the same problem with my 2004 F150. No one can tell me what it is.

  • Anonymous Jan 26, 2009

    i heard its the EGR valve going bad, my 04 is starting to whisle

  • Anonymous Jan 26, 2009

    Amazing, I started my 2004 5.4L this morning and hear the same thing. First time hearing it. It only happens at certain RPMs. Outside temp was in the teens. I hope its air and not a bearing.

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SOURCE: I have a 2008 Dodge

Hi, 2possible suggestions that will help you, when dealing with a wind noise it is almost always visible in the affected area by seeing a redich resedue caused by entering dust particles,

you could also use''masking'' duckt tape to seal off all your suspect areas(starting with the r/h section of the windshield) then by trail and error systematically remove piece by piece of this tape untill your noise is located, then you can decide on what to do with the ''leak''

Posted on Jul 23, 2008

emissionwiz
  • 61037 Answers

SOURCE: Engine makes a whistle sound.

It is the air bypass valve that makes this noise

Posted on Oct 05, 2008

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