Blow off valve

thuglike

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Linden, NJ
Have a BD Diesel BOV.

My truck has been down for a while. After a test drive with the new transmission I noticed a hugh boost leak.
Turns out it's the BOV dumping psi under throttle. What would cause it to work exactly opposite of how its designed to work without messing with it in any way.

Thanks in advance for the replies/input.
 

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