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Old 05-08-2012, 09:59 AM   #4
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX - 750WHP
9.5s @ 150mph

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The BOV isn't ideal, but if it's properly set up it won't do this. My guess is that the vacuum line from the top of the BOV to the back of the manifold popped off. It's not held on, and when it pops off it causes a pretty big vacuum leak that results in the exact conditions you describe. The other common leak on the 08+ WRX's is the throttle body to intercooler hose. The rubber end caps can come loose and cause a leak. The rubber pieces should be removed from both ends of the throttle body hose.

Those are the likely causes, but they may or may not be the problem in your case. It is also possible that your BOV is set up incorrectly and causing this. No matter what the root cause, it is definitely some kind of boost/vacuum leak that is causing this.
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