2000 Nissan Xterra

Engine Mechanical problem
2000 Nissan Xterra 6 cyl Four Wheel Drive Automatic 112000 miles

I bought this SUV from and was told had Mechanical Problem. So we tried to fix it changed some part like the fuel pump. But it keep rolling but not starting.
Can you help please!

November 10, 2008.

To determine if its fuel or spark do below

Get a carb cleaner and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, distributor pick-up coil, ignition control module, cam and crank sensors- Note: If it doesn't apply disregard it

Nov 10, 2008.