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  1. #1

    Question '87 Suburban, vacuum hose question

    Hello all! First post here, great place, thanks for having me!

    Anyhow on to the topic.

    I have an '87 Suburban V10 w/ a 350. I have what looks to be a missing vacuum line on a small electrical black box mounted near the throttle body.

    In the picture below you can see the vacuum line on the top of this piece going to the EGR valve, and under neath that hose there is a nipple that looks like it should also have a vacuum hose on it.

    Can anyone tell me what hose should be attached here and what it leads too? Or maybe it's supposed to be open like that? Any help at all would be great, thanks in advance for any help.

  2. #2


    If that's the EGR bleed the hose should just go to the air cleaner. You should have a vacuum line routing sticker on the underside of the hood or cowl unless someone removed it.


    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3


    Yeah the truck is old and has been repainted about 4 times, theres barely anything left to identify it as a Chevy, lol.

    I will check the air cleaner and see if I can find any nipples on it that I can attach a hose too, thanks for the reply!

  4. #4


    On my '95 Suburban, that second nipple on the EGR bleed valve simply had a foam air-filter 'sock' over it. The foam element has long since worn away. It doesn't affect the EGR operation unless you're in a sandy environment and the bleed valve gets clogged with dirt, preventing bleed air from getting in and causing the EGR valve to remain on all the time.

    Plumbing it to the base of the air cleaner would be a good way of getting filtered air to that valve. Hmmm, I should do that on my truck....
    Norwalk, CT

  5. #5


    Thanks for the reply, that sounds about right! I didnt notice any dangling hoses or places to plug it in so that definitely sounds right.

    Thanks for the replies and problem solved.

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