Old camry has new noise

My old camry (2008, 315,000 kms) has a new noise. Or maybe it is more apparent now.
It's related to engine speed (revs), not car speed. Sounds like a feathering dull noise. Possibly compressed air leak?
Might not go on long drives till it's been to the garage.

There is no compressed air in any vehicle unless it is for starting (diesel only) or brakes.
You do have vacuum for various functions such as climate control etc. They are small diameter rigid "hoses".
Get a can of spray carburetor cleaner. Yea, you don't have a carb, but find a spray can at your favorite parts store. Start the engine and spray it near the hoses. When the engine speeds up, you have found your leak. You can buy new "hose" (Toyota will probably have exact replacements, for an awesome price) or depending on the break, electrical tape may solve the issue.

JMWinPR wrote:There is no compressed air in any vehicle unless it is for starting (diesel only) or brakes.
You do have vacuum for various functions such as climate control etc. They are small diameter rigid "hoses".
Get a can of spray carburetor cleaner. Yea, you don't have a carb, but find a spray can at your favorite parts store. Start the engine and spray it near the hoses. When the engine speeds up, you have found your leak. You can buy new "hose" (Toyota will probably have exact replacements, for an awesome price) or depending on the break, electrical tape may solve the issue.

Thanks very much
Runs well still, idling was a bit unstable.
Sort of a whirring feathery noise, possibly disappears about 2000 +rpm. Perhaps a pump or some pulley, had a tensioner pulley changed a few years ago. that should be ok, serpentine belt looks good.
Gave it an oil and filter change yesterday. Coolant is good. Idling seems better now.
I take good car of my old cars, I'm pretty fussy about old cars NOT breaking down

JMWinPR wrote:There is no compressed air in any vehicle unless it is for starting (diesel only) or brakes.
You do have vacuum for various functions such as climate control etc. They are small diameter rigid "hoses".
Get a can of spray carburetor cleaner. Yea, you don't have a carb, but find a spray can at your favorite parts store. Start the engine and spray it near the hoses. When the engine speeds up, you have found your leak. You can buy new "hose" (Toyota will probably have exact replacements, for an awesome price) or depending on the break, electrical tape may solve the issue.

Very well diagnosed. You are right. I had a good look over the air inlet side (I'm not a mechanic at all).
Saw a couple of worm drive clamps holding 2 areas. Took a #3 phillips screwdriver, one tightened up about 1 1/2 revolutions. That is a lot, the other less than a full revolution, that is a significant.
Idle speed is stable now, it's not sucking air in where it should not.
Thanks very much.
Congrats