Noise engine or exhaust
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Freshman User
Joined: Apr 2013
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Noise engine or exhaust
I just bought a 2003 f150 king ranch 225k miles but runs extremely smooth, on cold start up I have a noise I cant figure out. It does not do it at idle, when cold it is only noticeable at slight off idle to 2-2500 rpm. At those rpms it just disappears (like a switch has flipped it off)untill I sit at a light for a few or after being in drive-through. After the truck is nice and warm I dont notice it at all unless i turn it off and it sets for about 10-15 minutes.
https://youtu.be/VC8UaMgtgNg
https://youtu.be/VC8UaMgtgNg
Fleet Mechanic
Joined: Jul 2010
Posts: 1,354
Likes: 31
From: Winnipeg
You probably have a broken manifold stud.. Once the manifold expands from heat the noise will sometimes go away. There was also a tsb for diesel type sound at idle that is just noise from the light off inside the cat convertor.
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I thought about that but cant figure out why it drastically goes away between 2 and 2500 rpm depending on the temp
More Turbo
Joined: Oct 2019
Posts: 632
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You could have the cat rattle that Ford fixed with a band rap (Think of a very big water hose clamp) clamped around in two places on the cat.
I think they wanted around $600.00 to fix it that way for one cat. What you are saying kind of sounds like it.
I think they wanted around $600.00 to fix it that way for one cat. What you are saying kind of sounds like it.
Fleet Mechanic
Joined: Jul 2010
Posts: 1,354
Likes: 31
From: Winnipeg
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