My 2010 cobalt ss is having a lot of problems with boost. My boost is getting up to maybe 5 psi on good day. I've checked all the vacuum lines and then inter cooler hoses and everything and couldn't find a leak. My blow off valve is also not releasing all at once makes a tututu then a psh. Someone please help.

 

Have you scanned the car? Gotta find out if you're throwing codes, then you can start to figure out the problem

 

How did u check for leaks? Did u look or actually do a boost leak test with a boost leak tester? U throwing any map sensor codes? Did u get the 3 bar sensors and have the new plugs soldered in or u have the pig tails? For ur bpv unplug it from solenoid and plug into intake manifold straight. See if it fixes. Let's start with those questions.

 

I had it checked for boost leaks and I have the 3 bar map sensors and its spliced in. And my bpv is already tied directly to my intake. It randomly started working right again so I'm gonna go through and solder my map sensors in instead of them being spliced for a better connection and see if that helps