Funny noises and vibration during start-up.

[JwUoNoG]

I started my car today, and I felt a vibration. The car felt fine otherwise. It happens everytime I start it now.

Before, it would make a high pitched "SKREEEE" noise when I started it.

What could it be? Is it my starter on its way out?

 

[oldman]

Check the crank pulley for any signs of separation.

 

[JwUoNoG]

I didnt get to check the crank pulley yet, it was too dark out.

I found that whenever the car is under 700 RPM, it vibrates a lot more. Anything above it, it feels very smooth and just fine.

 

[JwUoNoG]

I fixed it. It was the bolt that holds the alternator in. It was backing out, and consequently I guess the alternator was wobbling a little bit during start up.