03 Camry with intermittent wierd motor sound from under hood

[corlon]

my dads 2003 camry w/ a 2.4 liter has a wierd issue of sometimes having what sounds like a motor running under the hood. i thought i might be the idler pulley, but the dealer told him that it is hydralic. sometimes its there at start-up and other times it never makes the sound. the noise changes with engine rpm as well. i don't believe its related to tempture, a/c runtime, etc. its very intermittent. i would think the solaras w/ the 2.4 might have the same issue if its some kind of common problem. any suggestions would be great.

[BlackCamSe]

alternator whine?

[dorman68]

The 2.4L Camrys had an issue with a baffle inside intake manifold coming loose and making noises. There is a TSB stating the issue, the repair is to replace the intake manifold.