Some Nissan Xterra owners report experiencing starting issues due to a melted distributor cap and a lack of spark, even after replacing the fuel pump, filter, ignition switch, and distributor components. These problems may be attributed to faulty ignition components, such as a malfunctioning ignition coil or damaged spark plug wires. Additionally, electrical issues, including damaged wiring or loose connections, can hinder spark delivery to the spark plugs. Some owners also find that sensor problems, particularly with the crankshaft position sensor (CKP) or camshaft position sensor (CMP), contribute to the lack of spark. To diagnose these issues, it is recommended to use diagnostic tools like a spark tester or multimeter to check the integrity of the ignition system and spark plug wires. Thorough inspection of the ignition system is crucial to ensure proper functioning and to prevent voltage leaks that could impede the starting process.
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