Rattling noise during start up. I turn the key and there is a loud rattle noise when the car first fires up. When the car fires up it sounds like I have my foot on the accelerator as it revs up at first but goes to normal right away. Also I notice my car is taking a bit longer to turn over on some of my start ups. This seems to be more when I re-start my car after driving around a bit and the car is hot, but not always, it has done this in the morning on occasion. My car isn't over-heating though, it is just summer time now and the days are a lot hotter. I don't know if these rattling noises and delayed start ups are connected but they seem to go hand in hand. The rattling sounds as if something is loose but I can't be sure.