Unidentified Vacuum Line Under Throttle Body - Bypass Valve Connection

During a 7MGTE rebuild from scratch, the owner found a barb under the throttle body for a vacuum line but could not determine where it connects. No diagrams could be found showing lines going under the TB.

The barb under the throttle body is the vacuum connection for the bypass valve. It is not always clearly shown in common vacuum diagrams, causing confusion during rebuilds.

Moderate confidence — Original poster confirmed this resolved the issue