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5.0 and 5.7 Discussion, Optispark in Cadillac Engine Technical Discussion; Somehow the hose that hooks up to the optispark has vanished. Where does the other end of the hose go?...
  1. #1
    dretwenty5 is offline Cadillac Owners Member
    Automobile(s): 1995 Fleetwood vette starter, roadmaster climate control
    Join Date
    Jul 2004
    Hyattsville MD


    Somehow the hose that hooks up to the optispark has vanished. Where does the other end of the hose go?

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  3. #2
    BCs71's Avatar
    BCs71 is offline Cadillac Owners Enthusiast
    Automobile(s): 1994 Cadillac Fleetwood Brougham (some show and some go!)
    Join Date
    Oct 2003

    Re: Optispark

    There are actually two vacuum hoses at the bottom of the optispark. One runs to the air intake boot, on top (with a blue elbow fitting), just before it enters the throttle body. see pic: http://www.badbodies.com/brian/cadem5.jpg
    The other fitting runs alongside the driver's side of the intake manifold and into the center of the manifold, driver's side.

  4. #3
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
    Automobile(s): 94 Fleetwood Brougham
    Join Date
    Aug 2004
    Rockford, IL

    Re: Optispark

    This is bad to lose, hook it up ASAP.

    I occaisionally check my vent system integrity by connecting up a vacuum pump to the line to one side and plug the other and ensure it holds at least 15 inches for a while. Good opti maint!

    With oil getting on the lines at the bottom there they get soft and can fail or collapse. A new opti vacuum harness isn't too expensive from GM and worth it if yours is missing or failing.

    Only mod I would recommend is reroute the vacuum line from the air intake to the inside of the car somehow, draws in drier air that way.

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