So I get on the car pretty hard today and after it hits a decent level of boost I heard some kinda noise, which to me sounded like it was coming from the passenger side car. It didn't boost up as high as it should, and the car felt kinda slow, so I figured boost leak. So I come home to do a leak check, and I press it up to about 26 lbs according to my Tru-boost and I can't hear anything. While I'm listening around the car I hear a little pop. It wasn't very loud. Now it doesn't hold anything. I have about 26lbs still according to the compressor, but the truboost shows a little less than a pound and the airflow through the compressor hose has significantly gone up. I noticed oil splatter around my oil cap after the pop. HKS oil cap btw. When I open the throttle I can actually hear the air flowing through the intake manifold also.

Any ideas what could have "popped". I think it's something internal, cuz I still don't hear any leaking around the car, just flow noise. Thanks.

I checked inside the radiator and I didn't see any air bubbles, but I'm not really sure if I would.

 

Vacuum line off the intake manifold.

 

Thanks so much. It was a line off the egr valve. I didn't even think to check since I couldn't hear anything leaking.

I owe you some beers . .here you go!