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Discussion Starter · #1 ·
Probably a basic question I know, but I've always wondered. I figure it has something to do with vacuum, but then how is vacuum generated? And what's up with the vacuum lines that go to the hose between the h-pipe and the smog pump?

Thanks for any input.

(name withheld for embarassment :eek: ) :D
 

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The control module uses the VSS (Vehicle Speed Sensor) in the transmission to tell how fast the car is going relative to what speed you've programmed it to maintain. Then if I recall correctly it uses a vacuum servo to operate a cable connected to the throttle body to maintain that speed. The vacuum is generated from the intake manifold just like for all the other vacuum requirements such as the brake booster. I believe the vacuum lines that go to the hose between the AIR (Air Injection/Recirculation) pump and the h-pipe are for the the TAB/TAD (Thermactor Air Bypass and Thermactor Air Diverter) solenoids to make the switch between air Injection and air Recirculation. They don't have anything to do with the cruise control.
 
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