I have a 09 JK 2.8 Diesel and have just had a rebuilt motor put in. The JK has been running good for the last month but this morning the engine shut off while reversing out the driveway. It wont start but cranks really well. I've done the diagnostic code trick with the key in the ignition and no codes come up. The car has new injectors, glow plugs and fuel filter. Does anyone have any ideas before i get a mechanic to take a look?