There's a chance you're remembering "My Secret Identity", which lasted three seasons with 24 episodes each season, but as it was syndicated (in the US and other countries) it's possible any particular station you watched it on decided to stop carrying it or moved it to an inconvenient time.
In it, Andrew (Jerry O'Connell) is a teenager who has a very Marty/Doc Brown type relationship with his next door neighbor, a scientist, especially after one day, while visiting he gets caught in the beam of one of the Doc's inventions, which grants him super powers, including invulnerability, the ability to float (he needed aerosol cans to do more, at least at first), and, more germane to your question, super speed.