Optispark
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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
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    Jul 2004
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    Hyattsville MD
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    Optispark

    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!)
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    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
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    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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