Nissan Xterra cranking but not starting despite available spark on Nissan Xterra

Some Nissan Xterra owners report experiencing issues with their vehicles cranking but not starting, despite having spark. These problems can sometimes be attributed to electrical troubleshooting, where heating up the relays/IPDM has proven helpful, particularly in cold conditions. Additionally, if the vehicle is missing two out of the three essential components for combustion—spark, air, or fuel—it can hinder the engine from starting. Owners are advised to check the fuel system thoroughly; if the fuel pump does not prime or activate when the key is turned to the "ON" position, it can lead to starting difficulties. Furthermore, even with spark and fuel pressure, a lack of injector pulse can prevent the engine from firing, making it crucial to ensure that the injectors are functioning correctly. Lastly, verifying that fuel is reaching the cylinders is essential; if fuel is present at the rail but not delivered into the cylinders, the engine may fail to start. Adding a small amount of fuel directly into the cylinders can assist in diagnosing fuel delivery issues.