I have that noise too.. Sometimes it squeals while is running. I've changed the serpentine belt and it still squeals, I've come down to it being the belt tensioner. Gonna get it changed s

 

There's a TSB for the cam rattle. Unfortunately it's not a recall so if you're no longer under warranty, you're kind of SOL.

 

Is there a fix for the cam rattle and what is the effects of it? Will it continue to get worse and damage my car?

 

Yes, there's a fix, I had it done to my car. Luckily when it started, I was still under warranty and it was covered. I'm not certain what the details of the fix are or if it would damage your engine in the long term if left alone. Obviously you can still get it fixed if you're out of warranty, you'll just have to come out of pocket for it.

 

Any idea on approx. cost?

 

Sorry, no clue. I've long since shredded that invoice.

 

Rub a bar of soap on belt,if noise goes away ,bad belt.I bought a new belt that was bad also.

 

I'm getting relatively steady chirping out of my engine compartment too. On start up, somewhat slow and as the engine warms up a little steadier. I too am hoping it's the serpentine belt. 2003 LX 470 with 88K miles.

 

Replacing the belt fixed my chirp, and that was after I had purchased a new accessory pulley for NO reason.

 

Are you sure it's not a "whirrr" sound? Mine does this right after I shut down the car. It comes from the front somewhere. Sounds like a servo or something. I thought it was some electronic doodad in the car Now I'm kinda tripping

 

I have the same symptom. as the engine is shutting off, and the pulleys are coming to a stop, there is a bird chirp that you can hear. i have already replaced the serpentine belt, tensioner pulley and idler pulley. some people say it could be the alternator pulley where inside of the pulley cover, there is rust which you can try and get out to see if that is the problem. if not, i would say is the tensioner assembly. i'm in the process of wanting to swap out the tensioner assembly completely with a new one. i will also try to load up a video of it to show the community what we are talking about, since no one yet has been able to upload one.

 

does it sound like this?

this is a video of my car making the chirp noise as it shuts off

 

^Not so much as chirp in that video as a squeal or squeak; but nonetheless, that's something that I'd call normal.