Re: 1993 300SD Turbo Diesel

Problem:

After operating for 20 min +- in cruise--65-70 MPH, turbo boost not evident. Note: Step-down solenoid operational, but turbo boost absent.

Any troubleshooting tips would be graciously appreciated.

Consider-observation: Recently, while replacing the alternator on the aforementioned vehicle, I manually cycled the wastegate diaphram linkage to wastegate in a very quiet work setting. It was then, that I faintly and consistently heard escaping air, or suction, near the LH side of the radiator in the vacuum lines. Normal? Abnormal?

Kindest regards,

Hal

Captain B-737/200/300/400 [retired]