You want to put text on the path of a shape of a car, I think is what you're saying...
Photoshop 7.0/CS
1. Select the pen tool and make sure "Paths" is selected in the top toolbar.
2. Draw out the shape of whatever it is you want to put text around.
3. DON'T make the shape a selection.
4. Select the text tool (you should still see a black/grey outline on the screen from the pen tool.
5. Put the text tool near to this line, and you should see the cursor change from default to a slightly slanted one.
6. Click and type your text - it should follow the line!
I attached an example of text on a line - tell me if this is what you were looking for!