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On the Super Mod Squad
2002 3.0 VDC Wag + 2018 2.5 Leg Ltd
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27,775 Posts
on your other thread you said it is a automatic.

might be a air leak or a vacuum leak somewhere.

such would make a whirring / whistling noise when you are on the gas and then settle down when you get off and the engine rpms go down. possibly augmented by the engine twisting in the bay.

try opening the hood and putting the car in neutral with the hand brake on and revving it, and wiggling the plastic intake and see if you can adjust the noise.

the brakes run with some engine vacuum and that may also show some causality.

if you have not already done so, round a up a new OEM pcv valve. and install it / get it installed. bad ones can whistle and its part of the vacuum system.
(those get old and gunked up/ springs in them get metal fatigued as they age. ...I have pulled aftermarket pcvs off vehicles that did not even look like the OEM I just bought as a maint part as I had no knowledge if it was ever changed ).
 
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On the Super Mod Squad
2002 3.0 VDC Wag + 2018 2.5 Leg Ltd
Joined
27,775 Posts
Thank you! Interesting.. Yes it is an automatic. I read on another thread that Serpentine belt pulley and tensioner might also cause such noise.. having those replaced might be fix?
yes,

belts typically like to make more noise when cold, but when you are standing over them they also are the obvious things making the noise. and minor adjustments to the belts augment and fix some of the noises.

on a similar note, sometimes the bearing inside the alternator is the thing making the noise, and you can just cup your hands and cover the holes on top of it without getting them in the pulleys.

_______

but. your description of it stopping when you step on the brake, really suggests something in the vacuum system.
 
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On the Super Mod Squad
2002 3.0 VDC Wag + 2018 2.5 Leg Ltd
Joined
27,775 Posts
One more thing: Would this be the correct PCV valve to get from rockauto.com: https://www.rockauto.com/en/moreinfo.php?pk=50431&cc=1389405&jsn=356&jsn=356
this is the OEM and that one is similar. (ones for this particular car have the threads on the narrow end it seems).

keep in mind there are lots of rubber vacuum hoses to be checked also,...on a car this old one may find more than one damaged or dislodged.

https://parts.subaru.com/p/Subaru__/VALVE-COMPLETE-CONTROL/49223687/11810AA000.html

https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias=automotive&field-keywords=11810AA000
 
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