check to see if the alternator is working properly other than u need too do a full shake down of the car, undercar, engine components and so on. fuel, spark, injectors whatever could make the engine not start. witch could be anything. think of the main things your car needs to run, air and fuel correct? think of things that could possibly stop the intake stroke from getting the air it needs, or the combustion from happening on when the piston is between TDC and BDC, when both valves are open momentarly. all this could be a factor. needle in the hay stack, good luck.