High Pitched Whine / Whistle at Low Throttle

[barrios35]

I have this exact sound but in total opposite way. It happens when I try to accelerate under same conditions ie. driving for a while, engine warmed up, typically after 35-40mph and when I press the gas pedal down more, it goes away. So I sort of coast drive the Jeep, where I lightly push the pedal to gas, when the sound comes on, i let go, press gas pedal again, gain more speed, and drive it that way. What could it be?

I would check all the bolts around the throttle body,intakes and manifold. Make sure they are all torqued probably.

 

[HDRider]

I have this now.

At first it only happened when I was at highway speed and let off the throttle. I could play a tune with the gas pedal.

Then it started at lower speeds when I let off the gas.

Now it is doing it while at idle.

Reading this thread I never saw the real reason for the whistle.

 

[barrios35]

Could be various reasons. Each one of us had a different resolution to the problem. Start with the easy stuff before taking things apart.

My resolution was that the intake valve and headers were loose creating the whistling noise.