Intermittent Rattle Underneath

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Jul 6, 2008 | 07:57 PM

dlinkbham

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Intermittent Rattle Underneath

Sounds like a bracket loose. Set cruise at 77 and when the cruise lets off the gas, you can hear the rattle. It does it at other various times. Ford dealer says they can hear it but they can't tell what it is. They do not think it is the rear end.
I see a lot of posts that says check the heat shields, check for rocks in the heat shields, or get it on a rack and bang on different parts of muffler with a rubber hammer to create the noise with a tech underneath.
I travel the interstates a lot so after a couple of hours it is really annoying.
Thoughts???
Thanks

2001 F150 Supercrew 2wd

Last edited by dlinkbham; Jul 6, 2008 at 07:59 PM. Reason: Updated truck info

Jul 6, 2008 | 08:04 PM

slc10844

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Joined: Oct 2003

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From: Baltimore

The first thing I would check are the catalyic converters. When they start to break up they will rattle.

Jul 6, 2008 | 08:14 PM

AzBlueWolf

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From: SpringHill,Fl

Had a couple trucks that needed to add weights to the exhaust before rattle would go away...

check TSB's

Mark

Dec 28, 2008 | 10:27 PM

B's FX4

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From: Mi

so what do you do when the cat is rattleing? can you strip that outter part off or is that part of the cat? mine does it once and awhile and it is driving me crazy!

Dec 28, 2008 | 10:53 PM

caseydudem

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No I think he ment it is coming apart inside the cat, and if that is the case you can only replace it. If it is the outside shield that is rattling then you should be able to move it with your hand to see if there is play. Of course only do this when the motor is cool.

Dec 29, 2008 | 09:57 AM

B's FX4

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From: Mi

ok, this morning i went out there and looked at it again, the cat is falling apart and rattling, so i took a pair of channel locks and bent the edges back together as tight as i could and it stopped the rattle ! was a pretty easy fix, hope it helps out and thanks for your guys inmput