Engine noise/rattle when starting up??

[Lil bastard]

I'm not sure taking your Wait & See approach was the best decision. Your engine is making noises where it previously did not - it's telling you something's not right.

These motors can cost upwards of $10k to replace, alot more than a couple hundred bucks for a qualified mechanic to look it over. And soon as possible, don't wait weeks before taking any action.

Seeking advice here isn't your best bet either. There are lots of knowledgeable people here, no doubt, but they haven't seen the car and have only your rather vague description to render a guess on.

It may be nothing, and I hope that's the case. But, if it turns out to be something, you're much better served by addressing it sooner rather than later.

My advice is to have it looked at and don't drive the car (or at least drive it very gently) until you do. Good Luck!