I just did a rebuild on my cobalt and now that I got it back running I'm only getting about 8lbs of boost and no whine. Not sure what's up because before it was running between 16 and 18. Any ideas? I didn't know if i may have mixed up a plug or a vacuum line on the supercharger or what. The car is running fine and everything so I'm not sure if the supercharger just got messed up while it was sitting. Any help would be great.
thanks

 

Just kidding my wires were mixed up

 

ub=n plug the vaccum line coming from the intake to the boost bypass solenoid and plug then report back

 

Whats that for? btw love the signature lol

 

that vac line come from the intake manifold to the bypass solenoid is what allows the bypass solenoid to bleed off boost if the solenoid is bad it will just bleed off boost by unplugging it off os the solenoid and pluging will show if you have a bad solenoid or not

 

Alright I'll try it out and see what happens. Thanks man

 

any other ideas its still doing it and i have no clue whats up. i'm kinda thinking the supercharger might have got messed up because its pretty noisy at idle

 

did you check the bypass butterfly and the canister

 

I checked the thing you told me to do at idle and when I took the vacuum line off it wasn't leaking any air out the back. Everything worked fine before I tore it apart so that's why I was thinking maybe something happened to the supercharger.

 

plug the line and drive it do a pull not set and idle make sure you plug the line that is coming from the intake manifold

 

Alright I did that and everything was exactly the same I got almost 10lbs of boost then it stops

 

well then i would make a boost leak checker and hook an airhose to it to see were its leaking at

 

I have one but its for a four inch inlet lol. You think I should just replace all the vacuum lines? also do you think it could be the supercharger?

 

i would just to cover the basis but i wouldleak check it and check the by pass butterfly and also check your boost guage it could be bad

 

its not the boost gauge cuz it doesnt really feel like its pulling at all