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  1. #1

    Default Trailblazer Vacuum llines

    I'm customizing my trailblazer. One thing i'm doing is putting in aftermartket guages one of which is vacuum guage but i have no idea where any of my vacuum lines are. Can anyone help me?

  2. #2
    Legend bry2500's Avatar
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    Default

    Welcome to the site!!!!

    On the fan shroud or front frame near the hood latch should be a label with the vacuum line diagram. I have only one accessible vacuum line on my 8.1L and it is 1/8in diameter. I hope you don't have the same problem.
    BRYAN

    "IF YOU DON'T TREAT IT LIKE A TRUCK IT'S JUST A REALLY BIG CAR"

    02' Avalanche 2500 Onyx Black
    8.1L Vortec
    43,000 miles

  3. #3

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    welcome to the site

    2003 Z71 Silverado LS
    Access roll up cover
    Bed Rails
    Billet Grill insert
    Bed Rug
    CB with PA system
    Waiting to be installed
    Two 8in RF HX2 punch( would have 12s but they got stolen)

  4. #4

    Default

    Welcome to the site! You could use a Chilton Manual or another repair book to give you that information. Maybe even online.
    The diference between stupidity and genius is that genius has limits.

    2007 NBS Silverado
    LT2 Z71
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  6. #6
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    dwill3015's Avatar
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    Welcome to the site!
    Darcy
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  7. #7

    Default

    Moved to general tech

    You might post your year/engine, in case it makes a difference in vacuum supply.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  8. #8

    Default

    You can install a "T" fitting in an existing vacuum line easily enough. The harder part will be determining which lines are 'constant' vs 'ported' vacuum. Constant vacuum sources always see a vacuum. 'Ported' vacuum is only present at certain throttle settings (typically no vacuum at idle, but normal vacuum above idle throttle opening).

    Typically, any vacuum line that terminates directly into the intake manifold is a constant vacuum source. Examples would be the fat hoses that lead to the power-brake booster, PCV valve, or a choke-pull-off on older carbureted trucks.

    Any lines that terminate in the throttle-body can be either ported or constant. Absent the factory manuals, the only way to know for sure is to connect a temporary vacuum gauge and see if it registers full vacuum at idle - generally that indicates a constant-vacuum source.
    Kirk
    Norwalk, CT

  9. #9
    Sr. Apprentice leadpan101's Avatar
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    Default

    i am actually a friend of the guy who posted this, and we figured it out thanks for the help?


    Leadpan101 :great:
    2003 Chevrolet Silverado Z71
    1996 Honda Accord

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