5.0 and 5.7 Discussion, Optispark in Cadillac Engine Discussion; Somehow the hose that hooks up to the optispark has vanished. Where does the other end of the hose go?...
- 02-19-07 09:36 PM #1Cadillac 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?
- 02-21-07 01:46 PM #2
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.
- 03-02-07 09:03 AM #3
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.