I was doing a boost leak test and found a large leak at the LICP and that made a huge difference.

However, I noticed still a small slow decrease in pressure and wasn't sure if this is normal or not.

I have the leak tester hooked up at the intercooler inlet elbow. So pressure would be held at the intake side of the intercooler all the way to the t/b. Also pressure would be held from the LICP up to the BPV. This is the factory BPV.

In the video, you can see the pressure loss is slow, but still apparent and i can hear it in the MAF housing. Which the only way it could be getting there is via the BPV.


[youtube]]tw2CcPYPStI[/youtube]

 

If the throttle is closed, the BOV will have a hard time holding a lot of pressure. Especially a stock one.

Also, a boost leak remaster should be attached to the turbo inlet so that you're testing all of the pressurized intake tract

 

get you a spray bottle put some dawn in it and spray every single connection with the mixture while you have positive pressure on the system (if you have not already). Watch for bubbles rinse repeat till no more bubbles!