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I have this rattiling noise near the header cover. Its sounds like a tin can rattle. It only happends after i rev it up and it comes down on rpms.
 

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yea, i have an 88gt with almost the same problem i think, when you hear it from inside it sounds like it's coming from the passeners side where there feet are kinda... right? i dont know what the heel it is either.... but i would like to, it almost sounds like my tranny is gonna drop out.
 
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If the sound is around 500 to 2500rpm. Its probably a clogged catylic converter. Crawl under your car and hit it with a rubber hammer and listen for ratttle.

It could also be backed out exhaust manifold nuts. Causing an exhaust leak "whistle".
 

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I would think it is a loose exhaust manifold heat shield or loose catalytic converter heat shield. Try removing the exhaust manifold heat shield and see if that helps.....might want to replace it eventually.
 

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I had a very similar rattle on my dx, it turned out to be a heat sheild of some sort. I really cannot tell you wich one, as I pulled them all one afternoon after being driven half insane by the tin man!
 

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the heat shield underneath needs to be inspected while running .

should that not be the noise, consider the harmonic balancer. it can have an intermittant rattle at times if bad.
you may call it the crank shaft pulley; it has a rubber insulator inside a metal sandwich which can deteriorate . if very bad, you will observe a pully wobble where the alternator belt turns off of the crank.

its been awhile, but i do not beleive the timing belt needs removal.
 
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