( video added) engine bay noise, possibly intake manifold

[rippinitup]

sup guys, for a while now i have been having some sort of rattling noise when the motor warms up, sounding like its coming from the intake manifold. ive already changed the pcv vavle hasent made a difference. it isnt a really loud rattle noise. you got to know what your listening for to distinguish it.
now when i start creeping towards 4500 to 5k rpms i get this loud whistle type sound and only gets louder near 6k rpm. is something wrong with my intake manifold? maybe warped? leaking? thanks for the help!

 

[SLCHOE]

sup guys, for a while now i have been having some sort of rattling noise when the motor warms up, sounding like its coming from the intake manifold. ive already changed the pcv vavle hasent made a difference. it isnt a really loud rattle noise. you got to know what your listening for to distinguish it.
now when i start creeping towards 4500 to 5k rpms i get this loud whistle type sound and only gets louder near 6k rpm. is something wrong with my intake manifold? maybe warped? leaking? thanks for the help!

Whistling type noises are almost always vacuum leaks. If you check your fuel trim numbers i would bet they are high at idle and come down near zero at 3000 rpm.

 

[rippinitup]

Whistling type noises are almost always vacuum leaks. If you check your fuel trim numbers i would bet they are high at idle and come down near zero at 3000 rpm.

thanks for the info, i suspected it may be a vacuum leak. i just dont know how to diagnose it. my mechanic told me if theres a leak yull have a check engine light. but something is up. most of the time ill get a loud whistle but at times itll stop.
i dont totally understand fuel trim levels. aint much of a mechanic but i try to learn and do things myself.
oh yea i have an airaid jr tube. i also changed my mass air flow senosr few months back, i believe since than ive been hearing this sound.

 

[SLCHOE]

Water bottle

(skip to 7:07)

(skip to 8:30)

Even though your engine is of a different make, the same still applies. I've done smoke tests hot and cold that didn't give me any direction where a simple bottle of water did.

If indeed you do have an intake leak, this will find it.

 

[rippinitup]

thanks for the info man, i just gave it a try couldnt find anything.

 

[rippinitup]

Here's a clip of the whistle sound I hear. Listen closely Yull hear it when the rpm starts to climb

 

[rippinitup]

anyone?? cant figure out what it is

 

[SLCHOE]

Sounds like an air leak pre-MAF. Just take everything off and put it back to factory. Run it and see what happens.

 

[rippinitup]

I took it all apart 20 times lol. Sometimes makes noise, sometimes it doesn't. I'm thinking it's my MAF for some reason.