Boost leak test question

[99 gst spyder]

I did a BLT today and I can hear my turbo spool very loud and not sure but at the same time, seems like a loud hissing coming from the the o2 housing area. Either the o2 housing, dp, ex. Manifold gasket, wastegate or something around there. My tru boost gauge will slowly go up to 12 psi max then slowly drops down to zero. I don't know if the 12 psi max has anything to do with my 14psi waste gate spring.

While driving, I don't have any problems with boosting. I would hit my 14psi waste gate spring like nothing and would hold there until I let go. Still feels pretty strong and boost fine. Just sitting a little low on vacuum around 10 at idle.

Over all I don't seem to find any leak elsewhere.

Anything would help.

 

[Blindsey]

Did you ensure the motor was set to 30* ATDC?

 

[99 gst spyder]

Did you ensure the motor was set to 30* ATDC?

No I didn't.

 

[Colt4G63 also]

No I didn't.

I've never done that either.

What do the soapy water bubbles say the leaks are from?

 

[99 gst spyder]

Well I just put the engine to TDC and I don't hear the very loud turbo spool or that very loud hissing noise anymore. All I can hear is the air entering the turbo but even with spraying water, I can't find much air bubbling much. My only problem now is that If its at tdc, I can't seem to get any reading on my tru boost gauge now. But if I turn the motor a little to not have it at tdc, then I get readings on the gauge. Weird.

 

[harrison_gst]

i have the same hissing from my o2 housing..