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2004 Mustang Rattle

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Jun 30, 2019, 7:59 PM

Post #1 of 2 (524 views)
2004 Mustang Rattle Sign In

I have a 2004 3.9l v6 automatic mustang with 125k miles. Around 105k miles my car started randomly making a rattle from what sounds like the engine when I accelerated and it’s been slowly getting worse. Now it is a loud rattle that only occurs in third gear or higher and only in certain parts of the throttle. The rattle sounds like a metal on metal rattle and it only happens between 2000-3500 rpms and it does not happen is first or second gear or at idle, so I cannot listen while revving it. Also, it is the loudest when I am going up hill and automatically stops when I let off the throttle or accelerate harder. There is also no power loss or change at all besides the noise. My car has a p1336 code which is labeled as a misfire monitor hardware code and a reported fix is the camshaft position sensor and sycroniser assembly. I replaced both but it did not fix the nose. I also turned the crank and it seemed like the timing chain was not stretched but I am not absolutely certain that it’s not bad. This link is to a video of the sound happening, you may have to turn up your volume to listen but it is much louder in person. Anyone who has an idea of what it could be please let me know. Thanks.

(This post was edited by Austin8341 on Jun 30, 2019, 8:01 PM)

Tom Greenleaf
Ultimate Carjunky / Moderator
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Jun 30, 2019, 11:32 PM

Post #2 of 2 (496 views)
Re: 2004 Mustang Rattle Sign In

Just the noise first: You've heard this for 20,000 miles and didn't go looking for it? OK it's your car.
Most common to me with RPM and load related noises is exhaust parts and heat shields front to rear some cars have several. Spot welds let go and make noise till they fall off catch those in time you can fix them or not. Rubber hammer taps on exhaust parts you can find them or plain look and feel for where things aren't right.

So common when first heard fix them. Some are top and bottom half things like shaped pie plates if lose them can be up for costly new pipes/parts and do need them! Should be on a check list right along.

If you wait like that to find out yourself or hire it then it's just going to cost you more or cause harm whatever is found you know it shouldn't be making noise,


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