Help with car 2-player Input

I'm trying to create a 2 player splitscreen racing game using prefabs and scripts from the unity car tutorial as well as using this tutorial -

http://www.indiedb.com/games/caredu/tutorials/splitscreen-input

so far I have

1. Mapped new input buttons for the second car.

2. Created Car2 script by duplicating the Car.js script (removing wheel and applying new inputs).

3. Deleted the original Car script and dragged in the new Car2 script.

4. And placed all the necessary objects into the Car2 Script

But when I run the game the second car gets stuck in the ground and cannot move.

To try and get my head around what was going on, I deleted the Car2 script from the second car in the source project given by the tutorial and re-applied it and got the same problem.

Any help will be greatly appreciated.