Q&A

I would check for fuel pressure and spark when the engine fails to start. Is the Service Engine Soon/Check Engine Light on? If so codes stored in the computer of your car may indicate where the problem may lay. Even if a light is not on a professional grade scan tool can be used to read live sensor data rather than have to do intrusive testing at each sensor. If you need a wiring diagram and test procedures for sensors, there is a company that independent auto repair shops buy their information from that the same information inexpensively to do it yourselfers. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
Hyundai as a car manufacturer put a lot of free technical information and workshop manuals on line for Hyundai owners. Check out www.hmaservice.com lots of great information.