hello there I have a 2007 cobalt ss and i am making no boost i have changed the supercharger bypass solenoid but I am still making no boost at all tell about 5000rpms I also replaced the vacuum lines to and from the solenoid just wondring if anyone has had this issue before
at idle I am bulling about -65 kpa to -70 kpa

thanks

 

@huchters35 I had made a few posts last year with a similar issue with my 2007 LSJ. You can look those up, my first question is - did it ever make good boost? Mine had the problem from the time I bought it. Where I am at now is, I bought a used ECM that had a stage II tune on it. I swapped out the ECM and then made plenty of boost. However, the new ECM presented other issues, like reading the fuel gauge backwards! I believe the ECM was from a 2005 and from what I've read there are some differences. Anyway, my stock/original ECM is at ZZP right now getting tuned. I'll let you know how I make out.