Pontiac Problems? Ask a Mechanic for Answers ASAP
Hello, my name is ***** ***** I am a professional here at Justanswer. Thank you for your question and I will assist you with your concern.If your missing a bolt and the pump is moving and not mounted solid then it will throw the belt. Before you consider replacing any parts installing a new bolt and getting the pump mounted solid again needs to be done first. Once that is done and all the pulleys line up and all of them turn freely they that is likely all your going to need. Start with replacing the bolt and then make sure all pulleys turn freely and if so reinstall the belt. Let me know the results and we can work from there.
Because you only have one drive belt if any part of the system come loose it will not allow the belt to hold tension so the bolt needs to be replace. I suspect once you get everything tight again the problem will be solved and the belt should hold.