I have a 3.7 2013 Mustang
that I have owned since new. And since new, it has had the occasional odd start noise. It is at the end of ignition and it lasts a second or two. It never occurs on a subsequent restart. It happens after the car sits at work in the sun (maybe every third day or so - not every day). It never happens when I start it after sitting overnight at my home. It can be an extreme and embarrassing rattle. Recently I think I have id's a belt squeal in it sometimes.
I've brought it to the dealership and they can never recreate it and offer no help at all.
At first I though it might be an exhaust shield rattle, but the squeal now make me think a belt. There was a belt tensioner recall, but mine is not that date range. Could it be the timing belt? I'm tempted to just get rid of the car. Any ideas???? I've attached a video - you'll need to turn up the sound. the noise is at the end of ignition at the 4 sec mark. Thanks