The welds have broken loose on the heat shield. do not attempt to re-weld it, this could damage the onboard computers. try using J B Weld. or some type of high temp epoxy.
SOURCE: loud rattling noise coming from the engine
Are you losing power as well? if so it sounds like the camshaft is worn, this can be confirmed with a compression test
SOURCE: 2005 Nissan Altima makes rattling/vibration noise
It is possible that you have some timing chain noise, especially if you have the 3.5L engine. The secondary timing chain tensioners on the 3.5 have a known problem, Nissan has issued a service bulletin regarding this and there is an updated part to replace them. It is not a cheap job, but your dealer may give you some "goodwill" depending on your mileage. If you have the 2.5L the problem may a couple of other things...even more serious! They had catalytic converters that came apart and got ingested into the engine, eventually destroying it. Try googling "Altima rattle" and include your engine size in the search. There is a ton of info on the net about noises in these cars.
SOURCE: 96 Mazda Protege 1.5 L Rattles When Accellerating
possibly the cat itself broken up and rattling in side the silencer especially if more noticeable when engine warmed up.
SOURCE: 1989 gmc sierra c1500 with 350 automatic 8 ft bed regular cab vibration at 45 in overdrive
I had the exactly the same problem, in overdrive my truck would start to shake, in 3rd it would instantly go away, i assumed it was the flywheel to, THIS IS NOT THE PROBLEM, your tranny is in good shape and flywheel are in good shape, I had the "Idle Motor" replaced is what my mechanic called it, this completely fixed my problem, also my fuel milage went up considerably after having this replaced, hopefully this will help you out
SOURCE: cannot take off metal plate on back of rear view mirror to reattach to windshield.
I think this will be of assistance to you
This is the directions from the Ford factory manual.
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if its a tiney noise comming from under the car its the heat shield for your can dont try to weld it back into place as it will probably burn holes in the cat just get it taken off my c180 did the same and i took it off been like that for over 7 years and i have had no problem
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