I have a question about the vacuum pump.
I do not trust my pump atm, i have a metallic noise around 1500 rpm.

Can i remove the pump and run the car without pump to see if the sound is gone?
its an OM602.911 from 1986
The is my engine running: http://www.youtube.com/watch?v=92A5gLom_ug&feature=plcp
start at 0.25 mark