2003 Ford Expedition Howling Noise

Tiny
ISLANDER072
  • MEMBER
  • 2003 FORD EXPEDITION
  • 112,150 MILES
I have a 2003 for expedition with a Triton 4.6 liter engine I get a howling or growling noise that sounds like its coming from the air intake dome where. It seem like the noise comes and goes intermittantly but when the noise is there and the gas pedal is pushed it goes away. This been happening for a while now. I thought it had something to go with the stock air box do I recently put in a K N. Cold air intake system and the noise is still there. I read on a few web sites that it may have something to do with the IAC do I took it off and cleaned it out. When I first put it back it seemed like it helped but after a few engine cycles the noise came back. Can you please help me on this issue. Thanks.
Monday, July 8th, 2013 AT 12:43 AM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try cleaning your throttle plate on both sides with choke cleaner and make sure no holes in airduct and on everything correctly
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Monday, July 8th, 2013 AT 6:59 AM
Tiny
ISLANDER072
  • MEMBER
  • 4 POSTS
I had the throttle body cleaned a few months back as well, at that time I had th plugs replaced as well.
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Monday, July 8th, 2013 AT 7:41 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You might try removing your fan belt and starting truck up if noise goes away it's in the accessory drive someplace.
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Monday, July 8th, 2013 AT 10:38 AM
Tiny
ISLANDER072
  • MEMBER
  • 4 POSTS
I removed the belt already and the noise was still present. The noise sounds like its coming from the air box area. Which was replaced by a K N kit
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Monday, July 8th, 2013 AT 10:52 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Don't know what to tell you other than it's an air leak then have a local pro look at it and give an opinion.
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Monday, July 8th, 2013 AT 11:56 AM
Tiny
ISLANDER072
  • MEMBER
  • 4 POSTS
Ok thanks, last question for you. Do you think it could be the IAC causing the noise? It's weird comes and goes, but when you press on the gas pedal lightly it goes away. May be I'm describing it wrong by saying a grawling noise My friend said it sounded more like a popping or humming noise. Thanks for your help.
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Monday, July 8th, 2013 AT 1:08 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Hard for us to tell here
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Monday, July 8th, 2013 AT 2:56 PM

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