I just bought my 06 cobalt n I noticed I can't get it to boost over 3 psi but sometimes I rarely it boost normally. I replaced my bypass valve acuator and still have problem a guy from zzp told me to u hook bottom hose on bypass valve and plug it. My issue w the boost went away now my question is wut do I do to fix this the right way or can I leave it like this. I have a smaller pulley I am going to install amongst more mods n e info would help thank you 06$$sc

 

If plugging the vaccum line to the bypass fixed the problem then something is wrong with the bypass valve actuator you put on or it's not installed properly.

 

welcome to Cobalt land, Once you enter there's no escape.

 

or something is wrong with the solenoid

 

I have a lean/ rich coad on my car now 172 I beleave been on for awile only thing I did was put a cold air intake on it. I also went to the strip w it and it only got 16 seconds witch I think is to slow for the car wut can I do to get rid of the coad of wut is wrong w it wut is causing the coad? Help plz 06$$sc