hard plastic vacuum line

2000 PONTIAC GRAND AM
235,603 MILES • 3.4L • V6 • FWD • AUTOMATIC
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NMILES
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On my upper intake have a vac port connected to a plastic vac line that run in the wire harness where is this line for and where does it go
Mar 22, 2016 at 3:31 AM
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KASEKENNY
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More than likely this is a line that runs from the EVAP to the intake or the intake to the PCV.

Here is a guide that will help with finding vacuum leaks if you need to find one:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please see the info below which is a diagram that shows the routing of these lines.

Let us know what other questions you have. Thanks
Oct 26, 2021 at 7:39 PM