Originally Posted by DarkSided23
Okay, my sis says it'* not a really awful noise, but she couldn't give me a good description of it either. She'* coming home with it anyway. She says that once it gets started it stays started, so she should be fine as long as she doesn't stop.
Right. My bet is that it'* going to turn out to be a weak battery or its connections, and the bad noise she hears is a rat-tat-tat-tat noise of the starter not quite engaging. If she was hearing the squeal you get from a misaligned starter (similar to when you grind the starter into an already-running engine by mistake), I think she'd be a lot more scared about it.
I would do a thorough cleaning of the battery cables as we described, then drive it for a day or two before doing anything more expensive like buying a new battery. Give the existing battery a chance to benefit from your improved cable connections, like getting a better recharge from the alternator, before you throw any more money at it.