elcapetan

I'm experiencing a whining/squealing noise from the engine. It only happens after driving the vehicle around for 5 -10 minutes. I only hear it at idle, sometimes it goes away and can only be heard immediately after revving the engine. I though maybe it was a belt but it sounds like it is coming from the rear of the engine.

LS1 engine

Russ K

iTrader: (1)

Remove the oil fill cap, if the noise goes away, then it looks like the PCV fresh air hose needs to be hooked up to the 90* elbow on the throttle body.

Russ Kemp

joecar

Also check for loose/broken exhaust manifold/header bolts (this lets exhaust to blow past the gasket, causing a squeal sometimes, seems related to throttle, and unrelated to rpm; at other times it causes a ticking sound).

Old Geezer

iTrader: (3)

Intake torqued down?

MIGHTYMOUSE

iTrader: (59)

you do not have a pcv fresh air point. you are dawing intake manifold vac on the crankcase.