( video added) engine bay noise, possibly intake manifold

rippinitup · Oct 2, 2015

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 · Oct 5, 2015

rippinitup said:
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 · Oct 5, 2015

SLCHOE said:
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 · Oct 5, 2015

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 · Oct 6, 2015

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

rippinitup · Oct 7, 2015

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

rippinitup · Oct 21, 2015

anyone?? cant figure out what it is

SLCHOE · Oct 22, 2015

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

rippinitup · Oct 22, 2015

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.

( video added) engine bay noise, possibly intake manifold

rippinitup

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SLCHOE

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rippinitup

Full Access Member

SLCHOE

ASE Master Certified + (L1)

rippinitup

Full Access Member

rippinitup

Full Access Member

rippinitup

Full Access Member

SLCHOE

ASE Master Certified + (L1)

rippinitup

Full Access Member

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