Whine under load

[TrystanGST]

Bear with me, as I am describing the problem as told to me by someone an ocean away. My car is in Illinois, and I am here in Germany (for a little while longer). Anyways.

This problem started a few weeks ago. My car makes a whining/humming noise under throttle. If you let off the gas the noise stops, but the noise is intrusive enough to override radio etc. So Im guessing it must be decently loud. The noise also only happens when the car is rolling. Revving the engine in neutral doesn't cause the noise. The best guess is it is coming from the passenger side. The car still drives normally and doesnt appear to be losing boost. My brother and his fellow mechanics at the dealership he works at are having a heck of a time figuring it out, since they can't reproduce it with the car on a lift. From what I have been reading on here, whining usually indicates a bad turbo, or a boost leak. I am turning to the minds here to help me, before I go and spend money on things that dont need replacing (yet, this is a DSM afterall). Thanks ahead of time.

 

[EclipseTrbo420A]

Check for a boost leak....since the car cant make boost at idle ( there needs to be a load on the wheels) thats a good chance its that. just do a quick boost leak test. do you know how if not let us know..

 

[TrystanGST]

I admit, I don't know how to do a boost leak test. Cursory searches on the forums for boost leak test and boost leak tester returned hits about using one, but not what one is or how I go about getting/making one. So if someone could enlighten me...

 

[Darksyne]

I admit, I don't know how to do a boost leak test. Cursory searches on the forums for boost leak test and boost leak tester returned hits about using one, but not what one is or how I go about getting/making one. So if someone could enlighten
me...

http://www.vfaq.com/mods/ICtester.html