Whinning noise My 2004 Rav 4 makes a loud whinning noise when I'm idling. The noise is coming from the rev and goes from a low octave to a higher octave. It tends to go away when I accelerate. Got any ideas?

I suggest you have your car checked as soon as possible - while a rattling exhaust isn't desperately urgent it could be the cat breaking up which might later restrict the flow of gases. Most importantly excessively loose timing belts or chains tend to make most noise when the engine is idling. If the noise is being caused by this delay could be very expensive.

make sure there is no blockage or replace air fiter or maybe box not clamp together properly hope this helps

Is it a "wine" noise that gets louder when you rev it up? Sounds like an idler pulley. Is it a 3.3L motor?

may be your oil strainer is stock up or your oil pump is damage.i recommend use the f2020 powerlube to minimize the noise.search to www.f2020technology.com

it sounds like it is either your clutch or the throw out bearing. either way you more than likely need to have to install a complete clutch kit (pressure plate, clutch disc, throw out bearing, and have your flywheel resurfaced.

try adjusting the belt tension on the alternator

May be a bad bearing on belt tensioner or idler pully

When catalytic converters go bad, the porcelain matrix inside comes loose and is noisy.
But you can just unbolt it, break up the loose chunks, pour out the pieces, and it will run better than ever.
If you don't pass the next emissions test, then replace it.

But it could just be the heat shield rattling instead.
Take the shield off first, to see if it goes away.

catalytic convertor may be clogged

I had the exact same problem on my 04 GC. I put some Techron Concentrate Plus Fuel System Cleaner in from Wal-Mart and it seemed to fix the problems right away. Let me know.