Ok so i have my boosted na and everything seems great. until an intial run reveals i only get 0-1 psi... blows off mean as ****... but never gets any manifold boost... have checked for all kinds of leaks and replaced anything that didnt look sound and im still left with the same issue... while idleing i hear no leaks and sprayed it a little to see if i get a rev rev... nothing. so its like if i do have a leak its only when i get pressure.. i think at least any ideas... s4 btw.

 

Are you using an aftermarket gauge or the stock one?

The wastegate could be stuck or not hooked up.

When ou're driving does it bog or choke when you start to "boost"? Check for loose intercooler pipe connectors and such.

 

I recently got a bad boost gauge from prosportgauges and my vac is 28 and when im fully boosted 4 psi it says 10 vac.

 

aftermarket gauge, and tested another just to make sure.