Testing my vacuum lines for any leaking. Should they hold pressure wit car off?

Hey guys I’ve been using a hand vacuum/pressure pump to test my vacuum lines. Everything behind the glove box holds pressure except the line running towards the engine bay. Is this normal or does that mean I have a leak somewhere?

Im assuming it’s just sucking air from the intake, is this correct?

thanks!

Google search.

03 cobra vacuum hoses documented

Pdf2.

This has hose layout.

For me

Pulling vacuum hose harness and Check by hand is best on a leak. Or a clog.

Common leak areas

Pcv elbows

Evap in fender

Than the worst spot
Pcv line at lower intake
This is the po171/174 leak that’s hard to find

JCDriller said:

Hey guys I’ve been using a hand vacuum/pressure pump to test my vacuum lines. Everything behind the glove box holds pressure except the line running towards the engine bay. Is this normal or does that mean I have a leak somewhere?

Im assuming it’s just sucking air from the intake, is this correct?

thanks!

Click to expand...

Correct. The line is connected to the intake is open. That is where I plugged in with my hand pump. I also deleted all the unused vacuum lines and emissions stuff, so mine might be slightly different.