Originally Posted by layback40

First thing I would do is to get a piece of tube & connect it to the diaphragm at the back of the IP, then with the motor running, suck on it, it should shut the motor down, if not its the diaphragm. If it does shut it down, then it gets interesting, you should check to make sure you have vac at the vac pump. then work your way through the system. do your light adjusters working? They run on vac. Do the brakes work ok? A very heavy peddle would suggest the vac pump is bad.
I didnt say to hit anything with the hammer!!! As its moving & shouldnt, maybe it needs duct tape.