boost problem after coming out of the shop

[boosted2085]

I got my car back today from the mechanic and took her out for a spin after not having it for 2 weeks and noticed it's not boosting like it was before I put the car in... sometimes hits 7psi but mostly 3-4 psi... the car was out in to change the oil pan gasket.
it sounds like a balloon losing pressure or something while In boost
I'm pissed because it was boosting fine before I took it in.. when I got home I noticed 3 of the 4 nuts were off the back of the downpipe elbow and 1 nut was loose...

could that be the reason I'm not boosting as much as before or am I just having a boost leak in general?

 

[jake8790]

Not the issue. Most likely a boost leak. You can do a boost leak test, but I would guess your mechanic left a clamp loose somewhere on the piping that you should be able to find.

 

[91Supra313]

Not the issue. Most likely a boost leak. You can do a boost leak test, but I would guess your mechanic left a clamp loose somewhere on the piping that you should be able to find.

Why would there be a loose clamp when they didn't even touch a single one? They did the oil pan...

 

[boosted2085]

I looked at all the clamps but everything looked good...I guess I'm gonna have to make the leak checker

 

[7M4EVR]

Why not take it back to the shop and say wtf?

 

[Poodles]

If it sounds like a balloon losing air, it's probably a ripped coupler or rubber pipe...

 

[boosted2085]

Why not take it back to the shop and say wtf?

trust me I wasn't too happy and I had him take it back and fix it

If it sounds like a balloon losing air, it's probably a ripped coupler or rubber pipe...

I skimmed over the couplings and didn't notice anything that stuck out but I'll be doing a leak check when I get it back... and it sounded like a balloon but also high pitched.. so I'm not sure if it was the exhaust leak since 3/4 nut were missing

 

[7M4EVR]

But...an exhaust leak post turbo will not cause u to boost less. Now a leak pre turbo definitely will and is most likely the issue.

 

[boosted2085]

well at full boost it started to make the noise..so im not sure if it was a boost or exhaust leak(maybe from backpressure?)

 

[7M4EVR]

Well it could most definitely be the cause of the noise but you said it wasn't boosting like it was before you took it in.

 

[Suprapowaz!(2)]

Physically take off all of your intercooler hoses and thoroughly inspect each one. Re-install tightening each clamp down good. Drive it and see if it does the same thing.

 

[Poodles]

Or you could ask the mechanic WTF he touched...

 

[boosted2085]

I put a k&n filter,downpipe and boost gauge today...took her out for a spin and was only 5psi at full throttle..at about 4-6000 rpm's it fell flat on its face, losing boost quick..

im sure I have a boost leak but my question is wouldnt it lose boost sooner than 4-6k?...also my bypass valve is going off at every shift instead of higher shifts