it cranks but won't fire

An engine needs three things to run, mechanical integrity,fuel and spark. To find a problem like this I "tee into" the fuel line so I can monitor fuel pressure if you have no fuel pressure, you know your problem is fuel related, you then start tracing the fuel pump, fuel pump relay and sensors that allow for fuel pump operation. Next you need to determine if you have ignition spark at the spark plugs. If you have no spark the ignition system or its related sensors are the problem. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online