engine rattle

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Apr 24, 2007 | 10:06 PM

cobramustangboy

Thread Starter

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Joined: Nov 2006

Posts: 33

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From: Oak Ridge, TN

engine rattle

Alright, I got me a 99 F250 with the 5.4 about 6 months ago. Ever since I got it, it makes a rattling sound at low rpm and then when I begin to accelerate. However, once it gets up to higher rpm it stops rattling. It doesn't seem to be a problem, but its just one of those annoyances. I have opened the hood and tried to find the noise, its almost sounds like the fan is rubbing, but its not. It has a rattling sound like its metal on metal rubbing. The truck is stock, so has anyone else experienced this? Thanks.

Apr 25, 2007 | 06:15 AM

torkum

Posting Guru

Joined: Dec 2005

Posts: 1,550

Likes: 6

From: Mount Juliet, TN

Take your serp belt off and start the engine for a couple of minutes to see if its a external noise.

Apr 25, 2007 | 06:39 AM

Joe Finn

Laughing Gas

Joined: Oct 2003

Posts: 967

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From: DC

My truck has a noise similar to what you describe. It took a while, but I narrowed it down to the forward drivers side Cat. Something inside the cat is "rattling". I'm not going to mess with it 'til it blows out or fails inspection. It's just annoying.

Apr 25, 2007 | 07:00 AM

rsylvstr

Cargo Master

Joined: Dec 2006

Posts: 3,489

Likes: 45

From: Central NY

another thing to check, although the sound you describe seems different, is the manifold studs....see if they are all there.

May 17, 2007 | 11:01 PM

gryc

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Joined: Oct 2006

Posts: 15

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I have a '99 4.6l that had a rattle as well as a leaking head gasket, passenger side no less. I replaced gasket and also found the timing chain guides were worn to the metal which caused a rattle sound. After replacing there is no noise and a remarkable amount of power gain.