I think I have a vac leak

[gtpterp]

Hey guys,

While driving yesterday I could barely here my supercharger (I have a 3.4 pulley). The whine is usually loud and very noticeable. I wanted to check my boost so I checked it out on my torque app (never had any problems with showing how much boost I was under). The psi was running -20 and at WOT it was getting to around -5 psi I think. Usually it gets to about 9 at WOT and -10 otherwise. I'm thinking its a vac leak, any other ideas? If it is a vac leak what is the best place to search and how

 

[dsmuts]

Look over your vacuum hoses and if you don't see anything out of the ordinary check around with a can of carb cleaner.

 

[FordMan77]

Check the vacuum T under the snout of the S/C. This is a common place for them to crack/leak.

 

[gtpterp]

Fixed. Was my evap vacuum line. Thanks for the help!