Engine

2000 JEEP GRAND CHEROKEE LAREDO
100,000 MILES • 6 CYL • 4WD • AUTOMATIC
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MCAVINEE
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  • 69 POSTS
My son has a 2003 Jeep Cherokee that has just had a fuel pump replaced. Here is what it does. It will start at times and then go days without starting up. Just grinds
Aug 8, 2011 at 5:53 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
If its cranking over and will not start -Do below to determine if its fuel or spark problem

https://www.2carpros.com/articles/car-cranks-but-wont-start

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-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,coil's resistances,cap and rotor,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing
Aug 15, 2011 at 9:47 PM
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