Stevies_63

I’ve had a bad whistle coming from my engine bay that I believe is coming from the intake runner lever or somewhere around there that when my engine has been on for a while it will have a very loud whistling.. did know if anyone knows exactly what I mean or has any ideas on if it would be for sure from the intake manifold. Just want to check before buying a whole new one

E55Greasemonkey

Probably from the crankcase vent valve. It's a large round plastic piece at the rear of the engine slightly behind and under the intake manifold on the right (passenger) side. There is a square hole on the bottom edge that will suck air when the diaphragm inside goes bad. The valve and hose is separate from the intake manifold. You are supposed to remove the intake to replace it, but can be done without the intake off, if you are a pro.

503C43 ////AMG

The intake manifold gasket is usually a really high pitched whine/whistle that is constant while the engine is running. The PCV valve sound like a slipping belt and there is usually a dying whistle sound when you shut the vehicle off.

If you can post a video I can probably tell you if it is the intake manifold gasket or the PCV valve.