Engine cranking but not starting

The SC400 has two ignition coils and two distributors. Check to see you have spark at both ignition coils. the check for fuel pressure. There is a diagnostic socket under the hood with pins identified as B+ and one of the other pins is identified as FP, temporarily bridge the two connectors and see if the fuel rail now gets fuel pressure (will show the fuel pump is good). You need proper test procedures to properly diagnose what is wrong. There is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subscription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual try http://bit.ly/mitchell_repair_manuals_online and get an online repair manual subscription. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info