My car wont start up?

You should have a check engine light illuminated. The first thing to do is have your computer scanned. AutoZone will do this for free. Then get back with me with the codes it retrieves.

Also, when diagnosing a "No Start", begin with the bat and starter. In your case they obviously work.

Next you check spark at the plug. If there's none, then you trace that back from the wires to the coils and connectors (if they're receiving a signal from the computer) If you have spark then you check fuel.

This is done first by checking fuel pressure (static and operating). Next you see if the injectors are firing. If not, then you move to the wires/connectors and the computer and its sensors.

Finally, you check cyliner compression, which will indicate a mechanical problem.