shane0328

when i cold start my car i hear a high pitched screech/squeak and it only last for half a second but its loud kinda sounds like a belt squeaking but im pretty sure its no belt. starter maybe? i have no idea so please share your knowledge with me, thank you.

Vexzer

iTrader: (1)

If you are running aftermarket high-pressure springs watch out. Mine was a bad roller lifter skidding on the cam.

99_LS1_WS6

iTrader: (5)

It could be in the matching surface of the starter to the flywheel or flexplate

garygnu

a slipping belt,spray with sticky stuff.or a bad power steering pump.replace pump or rack.

shane0328

but right on startup? i would think if it was the power steering pump or a belt it would be making the noise constantly not just for a half a second on cold start please explain.

Midnight02

iTrader: (8)

Although it's tough to know without hearing the actual sound, however your description sounds a LOT like the starter matching up to the flywheel/flexplate. Had the same issue with my Corvette.

Elthesh

iTrader: (1)

Belt. Heard it before, many times. Neighbor recently replaced a bad belt that did exactly that. Squealed like hell when started then went away till the car was cold again. If you want to test, take the belts off. Turn the car on for 5-10 seconds, then immediately back off so you aren't running the car with no belts.

shane0328

i think ur right midnight02 im about to pull my t56 anyway so we will see i sure hope not though flywheels are expensive!

Vexzer

iTrader: (1)

Happens every time the cat crawls under the hood?

Schnell

It never happens on a warm start?

Try removing all the belts one night to quickly eliminate a belt or PS issue.

ULTIMATEORANGESS

iTrader: (4)

i agree with others its belt related.

eseibel67

iTrader: (10)

I had this and it turned out to be the main idler pulley. Screetched only on cold startup.

No need to replace, just remove it, clean and grease it. There are 4 of them in total on the engine.

oddwraith

iTrader: (1)

Yup, this ^^^ If not, I say make sure it's not one of the check valves for your AIR system. Black check valves that run into the exhaust manifolds from the AIR pump can sound like that when they are faulty or plugged. Not your AC system, but rather the AIR system. Mine sounded like a hissing/screeching sound until I replaced these. I don't know if it's the pump that makes the sound (from surplus pressure resulting from plugged check valves) or the valves themselves. You should get a code pop up for one of your banks (1 or 2) if you do a scan. Let us know if this is the case.