2005 Nissan Altima makes rattling/vibration noise

ANSWERS: Oil Loss, Buzzing Noise, ETC. - Nissan Forum ' Nissan Forums

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Buzzing noise at 2000-3000 RPM - Nissan Forums : Nissan Forum

www.nissanclub.com/...nissan-altima.../128490-buzzing-noise-2000-300...

Oct 28, 2003 - 6 posts - ‎3 authors
The "buzzing noise"; I can tell that I am not alone in having this problem but has someone figured out ... I fit does, that eliminates the brake rotors, tires, wheelbearings, CV's etc. ... BUT with an Altima it is probable the pre-cats. Loud humming noise when driving
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Could be timing chains stretched or tensioners broken.

Clutch fans make noise when low on R-135A...If you have not tried yet, follow can instructions and add a can of R-135A...the can instructions are very helpful...If you have already tried adding a can, a leak is apparent, and needs a quality mechanic look...Hope this helps.

I had a similar problem on a nissan altima, turned out to be a spun engine bearing. It only did it when the engine was cold.

that would be the engine front , you sure it's a Rattle ? if so ? it will be your Camshaft bearing noise, is it a 2.5 L 4 cylinders ?or 3.5 L V 6 !! .
if it's 2.5 L , your Camshaft bearings are starving for oil , so I suggest you check them both intake and exhaust cams and see also if the valve lifters or cam bearings are in bad shape , worn out ? check also both cams journals and drive journals to lifters ( contact operation ) if there is a suspicious gaps between them that also can cause a rattle sound .

I have a 2003 Nissan Altima making a humming sound towards the front of the motor at idle in Park.

Not sure if alternator or compressor.

Not rattle from timing cover has to be something Nissan already denies.

This is hard to answer without hearing the noise, a 2005 altima it would have to have alot of miles or have been drinen hard to need a motor mount, the compressor could be noisey or may be a loose heat sheild on the exhaust,a squeal noise would be a belt a rattle noise could be a pulley going bad or something loose, when ac is on it puts more strain on engine causing things to shake,i would have a second shop just look at it before doing anything, see if they both come up with the same problem, and dont tell them what the other shop told you about the mount, tell them only after they tell you its something else.

your on the spot on both.
make sure the shock is tight on both end and have a rubber bushing bewteen the car fram and the shock. then try the shock first. take a look at spring while you have it out.
change the belt on the compressor and make sure the pulley is square on the compressor, and the any other pulley the belt goes.

the timing chain guides have worn out. the engine will have to be torn apart to replace hem. a 12 hour job.

i had the same issue had the alternator replaced and their is no longer a noise.