I have a 01 1500 5.2l. When the engine warms up, there is a whining noise that sounds like it is coming from the front on the engine. I was told it was the pcv valve. I pulled the valve out and the noise quit so I went and bought another valve. Installed new one, same problem. When you kill the engine, it sounds like it is letting pressure off somewhere behind the intake manifold. Looked at the plenum sticky, sounds like that is a problem i have to and wonder if that could be causing the whining sound. Anyone have any suggestions. Thanks.

 

Whine, or whistle? Are you hearing the noise from the front of the motor? Or from inside the manifold??

 

sounded like the front like the water pump so i pulled the belt off started the engine still there. while it is running it is a whinning noise turn it off it sounds like a whistle from the back of intake

 

I used to have a whine sound like that on my 01..(If its the same sound as your hearing) and it turned out to be the idler pulley. But since you took the belt off, that shouldn't be it. I also have a low whining noise in reverse coming from upfront somewhere. Its always done that. Even after trans rebuild. Its hard to tell without seeing or hearing it. Video?

As for the pressure let off sound, my truck and my uncles truck both make that sound right when you turn the engine off. Sounds like a air compressor. We thought it was the air intake.

 

http://www.youtube.com/watch?v=7t7T6JcB86Q

 

Wow and it sounds like that with the belt off to?

 

Yeah. Thought it was a pulley or something up front until i pulled the belt off. If it is cold out, i can drive it for awhile with out it doing it. Once it warms up good, it will start back up.

 

Have you checked the plenum? if not pull off the air cleaner open the throtle thing and look for oil down in the hole if theres no oil the plenum is good if its nasty and oily in there the plenums bad. but im new to this whole Dodge thing so i don't really no what that could be making that sound.
im sure someone will point you in the right direction soon these guys are great!!!

 

another thought maybe the brake booster. i doubt it but i know its nice to have more ideas bouncing at me when im clueless.

 

Plenum is next on my list this weekend. I figure if it is bad along with intake gasket leaking that might fix the problem. I've had my '01 since dec. of 2000, so going on 11 years and this is the first time i've been stumped about a problem. Thanks for your help.