Help! Cummins ISX no Boost!

Thats the sensor at the thermostat hoousing i believe........How did they find that? Were there any codes?

 

I had a similar problem about a year and half ago. That same sensor. But when I did the overhead a couple of months later, the turbo accuator also was not quite working properly, so had that replaced. Nary an issue since.

 

Glad to read of both these fixes. My problem isn't that I have no boost, but at low boost 15-20 under very light load, or when the turbo is spooling back up after coasting, I get a terrible screeching reedy sound. And it is much worse when ever I am above 5000 ft altitude. In Eisenhower tunnel it is terrible. I had it once b4, and it was better after the EGR was replaced, but these sensors might be part of the problem too.