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Strange sound from stock BPV

tripat

Member
Joined
Apr 27, 2015
Threads
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Location
USA
Vehicle(s)
2015 Mustang EcoBoost Premium w/ PP
First off, I apologize for the redundant post but I mistakenly posted this in another sub forum. I thought it a good idea to put it here in the proper one for better visibility in case anyone else is having this issue or starts to.

Original thread:
http://www.mustang6g.com/forums/showthread.php?t=22921

In a nutshell, I get a weird vacuum like thunk sound from the bypass valve after revving the engine then letting it return to idle. This started several hundred miles ago and it feels like I lost some power when it started.

I made two vids of it:

Happens at 0:09

Happens at 0:09 / 0:21 / 0:29 (this is the best one)

Only mechanical mod to the car is an Unleashed tune but this issue started before I had the tune. I removed the tune temporarily and took it to the dealership and the tech confirmed it is for sure coming from the BPV by putting his hand around it while I reproduced the sound.

If anyone else is having this issue or has feedback about it please chime in.
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