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    waynewettlauffe's Avatar
    waynewettlauffe Posts: 1, Reputation: 1
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    #1

    Feb 28, 2010, 10:50 AM
    How can I test the EGR Valve for 2001 Honda Civic?
    I want to check that the EGR Valve is operating within specification. How can I tell if it's good or bad?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Feb 28, 2010, 12:06 PM

    There are three failures:

    1. The diaphram
    2. The vacuum control signal
    3. Gunk

    1. Easy. Apply vacuum to the diaphram with a vacuum pump with a gage attached. Engine should try to die. If it doesn't then suspect 1 or 3.

    2. At operating temp, check for moduation in the vacuum control signal.

    It is possible for the control vacuum to stick. Removing the hose and plugging should make the engine idle smooth.
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