tuffluck

iTrader: (4)

but there isn't one... so i ruled out everything, basically by eventually taking off all belts and running the car at idle for about 2 seconds, and my crankshaft was the only thing spinning and the loud whining noise was still going. what the heck?

the other possibility is a vacuum leak. i don't even drive the car that much...

can i do the re-greasing of the crank shaft like the one in this thread:

https://ls1tech.com/forums/showthrea...grease+pulleys

i already did the idle pulley and AC pulley thinking those were the culprit, but, well, NOPE!

please help me figure out what this is. what do you guys think? thank you.

CamaroRick

iTrader: (24)

did you take the ac belt off as well as the serp belt? If not Its likely the idler or tensioner for the ac compressor belt.
ohh i read you swapped that already, nevermind what part of the engine is the noise comming from? internal noise? does the sound come from the flywheel area? the starter stuck out onto the flywheel?

tuffluck

iTrader: (4)

doesn't sound like flywheel area at all. sounds like it's coming from the regular tensioner pulley and intake area but it's not the pulley.

tuffluck

iTrader: (4)

unbelievably enough, in my searching i found this thread, and it had a youtube link to it. the youtube link shows an f-body with exactly the same noise as mine, and i mean exact. turned out his a/c idler pulley was bad, but again, i took off both belts and ran the car and the only thing spinning was the crank shaft and it still sounded like this.

when he gets his camera to the right side of the engine it gets higher-pitched and louder...mine does the exact same thing.

http://www.youtube.com/watch?v=3TF5s0UFioM

https://ls1tech.com/forums/showthrea...+belts+removed

bczee

iTrader: (12)

hmmm.. my guess would be the time chain or oil pump...? get about 3'+ of heater hose and use it to listen to the engine to see if you can isolate it from which area it is coming from.

Good luck..

tuffluck

iTrader: (4)

well it sounds like it's coming from the TB/intake area, so i think vacuum leak. how would i check for one?

really no one has ever had a similar problem? i guess the timing chain is possible, but with only 60k miles on the car, timing chain seems awfully bizarre now.

LTLRDSS

iTrader: (2)

you sure its not the air pump

CamaroRick

iTrader: (24)

did the ses light come on?
does it idle high?

that video sounds like a whistle type noise also, if thats what your hearing.
I've found a plastic bag that got sucked up by the air filter before that had a similar sound to it, the air rushing past would whistle (not on an ls1 but same noise)

2001NBMZ28

Something easy to check, just pull the AIR PUMP fuse under the hood while it's making the noise...shouldn't be staying on though...

2002_Z28_Six_Speed

iTrader: (19)

Sounds more like a freight train.

tuffluck

iTrader: (4)

well i found it! it was a vacuum leak. the little piece of rubber hosing that connects the TB to the PCV valve had a hole in it. actually i felt quite dumb when i saw it. i was listening for the noise and had my ear up to the TB area on the right side and was like, "god, it sounds like it's really coming from RIGHT here, wait.........oh ****, i'm an idiot!" lol. i put my finger over it and the noise went away immediately.

i went to a-zone and got some rubber hosing that was almost the exact same diameter and cut a 3 inch piece and picked up a new PCV valve while i was at it (looks like the old one was leaking). sounds as good as new! glad it wasn't anything serious or seriously difficult to diagnose/fix. thanks for all the help!

2002_Z28_Six_Speed

iTrader: (19)

Congrats on your .75$ fix!!!

tuffluck

iTrader: (4)

actually i didn't even get charged for the rubber hose. i only bought the PCV valve!