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

Discussion in 'Engine/Tuning' started by JCDriller, Nov 2, 2019.

  1. JCDriller

    JCDriller Well-Known Member Established Member

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    Location:
    Kansas
    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!
     
    Last edited: Nov 2, 2019
  2. hotcobra03

    hotcobra03 Well-Known Member Established Member

    Messages:
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    Joined:
    Mar 11, 2007
    Location:
    poteet,texas
    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
     
  3. 03' White Snake

    03' White Snake Well-Known Member Established Member

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    Location:
    Mass
    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.
     

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