2002 s40 1.9t Loud sound at breather box

diggerdude · Oct 14th, 2017, 00:09

I'm trying to figure out what a loud sound is coming from the breather box, when taking off in low gear and after getting up to about 2000 rpm and letting off gas peddle I hear a sound like either a lot of suction or blowing. Could it have something to do with the Turbo?
Thank!
Also it does not happen unless it is in gear.
It could also be a muffled rattling sound.

clarkey1984 · Oct 18th, 2017, 19:35

If its a turbo then it'll have a dump valve / BOV surely? I know standard ones are quite quiet usually but you may still hear it when you let off, its just the excess boost pressure being released.

Oct 14th, 2017, 00:09	#1
diggerdude New Member Last Online: Jul 24th, 2018 03:01 Join Date: Sep 2017 Location: Phoenix	2002 s40 1.9t Loud sound at breather box I'm trying to figure out what a loud sound is coming from the breather box, when taking off in low gear and after getting up to about 2000 rpm and letting off gas peddle I hear a sound like either a lot of suction or blowing. Could it have something to do with the Turbo? Thank! Also it does not happen unless it is in gear. It could also be a muffled rattling sound. Last edited by diggerdude; Oct 14th, 2017 at 00:13.

Oct 18th, 2017, 19:35	#2
clarkey1984 Premier Member Last Online: Apr 13th, 2022 09:41 Join Date: Jul 2014 Location: Beccles	If its a turbo then it'll have a dump valve / BOV surely? I know standard ones are quite quiet usually but you may still hear it when you let off, its just the excess boost pressure being released. __________________ 02 V40 T4 S, "Sargent silver" she's back!

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