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A whistle is a hard thing to figure out, mainly because the tiniest hole can make a sound, even one that cannot be seen. I a a like problem with my intake manifold, I finally found it by carefully using starting fluid in small localized area along the manifold and when I found the hole the engine rpm came up then back down, but I could not see the hold even with a magnifier glass. So am not sure how to give you any ideas on how to check to find a hole you cannot see in your case, but I know even a antenna on your car can if bent slightly will also whistle on some models (this is why some antennas have a small wire wound around the main shaft, to break the wind passing the antenna.) Good luck on figuring this one out.
Remove the vacuum connection to the EGR valve and plug it with a golf tee or similar. If it stops whistling, remove the EGR valve and inspect for wear or seal damage (replace if bad). If you still have noise, suspect a leaking exhaust manifold gasket. Hope this helps!
This is a symptom of the inlet manifold gasket having a leak.The whistling is air going in through the small leak/hole in the gasket.With the throttle butterfly shut,air is getting sucked in the only way it can.Try tightening the inlet manifold bolts 1st.But more than likely the gasket needs replacing.Hope this helps
The GM 3.4 v6 engine is known to have Intake manifold gasket failure problems. IMHO, I do not believe this is fuel pressure release valve problem, since you would have fuel leaking. If it is more of a whistle rather than buzzing, i would suspect manifold gasket.
You are right. It is air leaking. You either have a vacuum line off the engine, or a leaking gasket in the intake manifold area. It could also be your PVC valve is out of it's grommet in the valve cover. You can locate the leak with the car running by using a mechanic's stethoscope. Just use it WITHOUT the metal pickup rod and diaphragm. Probe the open tube end around areas that sound like they leak or whistle. You can also use a can of carb spray. Just carefully spray around gasket surfaces and when the engine rpm raises, you've found it. Be very careful around a hot engine so you don't start a fire using this method.