I have a h22a turbo pushing 7lbs took out the old autotensener and put a manual one in was driving my car and stopped to show someone my motor and without warning my car suddenly starts dying tried to start it back up and it wouldn't the altenator belt is spining but my cams aren't moving what the ****?????????????????? timing belt is not broken.

 

You probably

1) sheared the key in the crank
2) crank pulley bolt came loose