Anyone have a place to point to if boost pressure wanders. Some times 18 other times 8lbs. Was working fine then slowly got worse. I was think 1 of the sensors. Thanks.

 

Explain your reasoning to kill the messenger? Wouldn't a bad vacuum valve come to mind first?

 

Hi, Are you talking about the actuator or that valve PN# 19168558. Which I have no idea what it does. First turbo car and I'm trying to get 160000 miles that are on it working like it was intended to.

 

Could be a lot of things. That part number is the bypass valve, you could open it up and check the condition of the diaphragm. Check for vaccum/boost leaks(charge piping, vacuum tank, vacuum lines). Those are some starters that are free checks.

 

2008 SS , I’d start looking at the piping and their connections, cracked intercooler that sort of thing, have a look at the valve at the turbo is that valve working? Perhaps the spring sprung
a lot of stuff in this thread

https://www.chevyhhr.net/forums/hhr-...t-56886/page3/

 

I was just wondering why you might want to blame an innocent coil of wire embedded in epoxy before a worn out piece of rubber.