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Howdy,
I own a 2006 Cobalt SS 2.0 supercharged. I do not have any codes and have replaced all vacuum hoses concerning the supercharger as well as sensors and even the bypass valve. My car will not build more than 2.5psi of boost even at full throttle, also at low rpms, the engine seems to bog down until it gets up to about 3K rpm then it accelerates but still without any additional boost. The pump for the supercharger coolant is working, the belt is tight and the supercharger is full of oil. I have taken the car to the dealer and they can not find out why the car is not building any boost. This is my 2nd supercharged Cobalt and I am aware of the power it is supposed to make. Any ideas what could be the issue here?
 
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