How to vacuum test secondary throttle actuator system

[scottfab]

Originally Posted by KJL

I have the plenum removed and thought it would be a good time to check the secondary vacuum actuators. I have a hand vacuum pump I use to check things out on my 72. With plenum removed, where should pump be connected and what lines should be plugged? There are lines to a vacuum pump, sensor (mounted under plenum) and a line that goes to the plenum and connects to the solenoid (not sure what this is for other than solenoid activation?).

Thanks!!

I'd go straight to the hose on each actuator. Test one at a time for smooth non sticking action and no leak down. If you have problems here there's no real advantage to moving to other tests.