I had good boost on my colbalt ss supercharged. I lost boost and replaced pump and bypass solenoid. Still low boost what else can I do,

 

What pump did you replace? Could be the diaphragm in your bypass valve is bad. Have you vacuum tested it?

 

supercharger pump and the bypass. got 5psi but I use to get 15 to 20

 

u replaced supercharger pump and bypass solenoid. I got 5 psi back but I use to get between 15 and 20.

 

Do you mean heat exchanger pump? There is a bypass solenoid that has a line that runs to the bottom nipple of your "bypass valve" that is attached to the supercharger. I am having a hard time understanding which one you replaced and have no idea what pump you are talking about.

 

The pump on front of superchager that antifreeze runs through. we tested it and was not working. After we put the new one in we still had no boost than we replaced the bypass solenoid. We are not sure on what to check next. I guess the next thing we are looking at doing is make sure the solenoid that is at the throttle is working properly. I understand that the solenoid has a rod that moves with the vacuum. So we are going to check to make sure it is also working properly if not I'll replace it as well.

 

Did you replace the bypass valve, or the solenoid?

This is the valve itself


This is the solenoid

 

The solenoid was the one we replaced.

 

Try replacing the valve.
ZZP sells them, or you can go to the dealership. The dealership here said it was going to take too long to get it for me, so I just got it from zzp

 

Ok we will try that. I want to thank everyone for their help.

 

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