I just had my 3" exhaust done an a 2.5" intercooler but i notice dat i wasnt boosting my gauge read 0 lbs an if i shift into higher gear an floor it the boost will go up to 4lbs an then start droppin till it hits 0 again i did a leak test on the intercooler setup an it hold more than 20lbs without a leak any suggestions on what the problem maybe thank you for all the help.

 

Check the hoses to the waste gate. Are you using a boost controller?

 

Boost leak. Make sure everything is connected and not coming apart.

 

All the hoses are tight as they could be an i did a leak test and it hold the air well without a leak an im not running a boost controller just stock boost could it be the wastegate actuator

 

Also be sure to measure the boost on a real boost gauge and not the stock one.

 

Its not the stock gauge its an aftermarket

 

It sounds like you know what you are doing or you wouldn't have added a intercooler.

Makes me wonder if something got sucked into the turbo? You had a lot of new parts that could have had something in them. Packaging peanuts, tape, paper etc. Maybe something soft enough to only drag the turbine down but not stop it.

 

He's running an intercooled setup on stock boost.

I'm thinking a hose is ripped or not connected properly.

Question: How did you do a leak test?

 

I removed the coupler that conect to the throtle body an plugg it with a pvc drain pipe an on the side of tHe turbo another plug with a gauge to measure air presure an i put 20lbs an checked all couplers with soap an no leaks at all i let the air sit for about 5 mins an only about 2lbs dropped

 

Yep. Does make it seem to lean more towards the wastegate.

 

How can i test the wategate actuator

 

Wastegate replaced an still no luck the only bad thing i could think of but dont knoe if its whats causin my problem is an exhaust leak on the left side manifold the gasket is out an it leaks alot i will change it but i was wondering if dat had anything to do with my problem thank you

 

Probably. Depends on the size of the leak.
Did you replace the Wastegate itself, or just the wastegate Actuator ? (or both)