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Vacuum leake on 97Z

This is a discussion on Vacuum leake on 97Z within the LT1 forums, part of the Vehicle Specific category; I need to know the best way to check for an air system Vacuum leak. I have recently replaced a ...

  1. #1
    Junior Member danjo11's Avatar
    Join Date
    May 2011

    Victory Red
    2000 SS

    Vacuum leake on 97Z

    I need to know the best way to check for an air system Vacuum leak. I have recently replaced a couple O2 Sensors and both ERG valves. I am still getting codes for a vacuum leak. (the gas cap is fine). Can someone point me in the right direction on how to check for a leak? Thanks for the help.

  2. #2
    Junior Member murche's Avatar
    Join Date
    Feb 2008
    Fairfield, CA

    93 Camaro has some vacuum diagrams. Get a hand vacuum pump with a gauge from an auto parts store for about 20 bucks, isolate lines and start checking for leaks

  3. #3
    None Shall Pass Knight's Avatar
    Join Date
    Jan 2010
    East of Cleveland, Ohio

    99 WS.6 - Modified

    Isolate each line and spray with starting fluid. When the idle raises, you'll be able to pinpoint the leak.

  4. #4
    Junior Member
    Join Date
    Jan 2007
    Flower Mound

    1997 Z-28

    x2, shouldn't take very long. Might also want to spray along intake manifold, but FYI if your's is painted it will take the paint off and you will be doing some touch up.

  5. #5
    Waiting on the Tree transamtom's Avatar
    Join Date
    Jul 2005
    Niagara Falls Ont.Canada

    1999 TA A4

    Both EGR's?

    There is one EGR on the back driverside of the intake.

    Do you mean the Air Diversion Valves on the exhaust manifolds?

    The intake manifolds are notorious for leaking at the back.

    They cast the drip rail on the manifold too short and you blow the RTV sealant out.

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