A while ago I had posted a thread about a boost problem I was having after I did my turbo swap. I had put the new turbo in and then about a week later, I was at a stop light and when I went to accelerate I had no boost....none. After a few days, it just came back. When I say no boost, I mean 0psi. I can hear the turbo kinda spool but barely. I am thinking it may be the wastegate, but its just odd as **** that it just went out, came back, and now its out again. If my wastegate was broken, it would stay broken, right? I am just at a loss. Oh yeah, this time it went out when I started my car and pulled out of my driveway. I didn't have any boost going down my street. I do not have any boost leaks. I did the EGR/SAI/PCV delete so I don't exactly have that many places to leak I also checked my intercooler piping and everything is good. Also, I replaced my k03s with a k04. I have a turbosmart MBC and it has been taken apart and put back together so I know that its good. The lines going from my wastegate - MBC - turbo are new, my DV vac line is new, all my vacuum lines are new. Any suggestions would be great....

 

completely remove the vac line going to your wastegate and see what happens. you should go up to 25 psi easy, if you dont, then its something else

 

So it turns out it was my MBC. I rebuilt it again and its good to go. I dunno, atleast it was something free for once...