Cummins ISB 5.9 Cranks but no fire-ECM power.

MrWizard wrote:
I had a 95 Safari with the Cummins 5.9
And had to replace the injector pump, mine was the old mechanical style, lift pumps provide the volume of fuel from the tank, but the injection pump supplies the pressure needed turn that fuel into vapor when sprayed into the cylinder, I think you lack fuel, not enough going into the cylinder to properly combust,
My insufficient knowledge says the spray goes in to meet the hot compressed intake air already in the chamber, meaning lots of pressure is need from the injector pump, my memory might be faulty, need to hear from Wolf or other more knowledge diesel person

Very good. A slightly different way of looking at it:

The temperature needed for combustion (to cause an explosion when diesel is injected) is straight from the IDEAL GAS LAW. PV=nRT. With the diesel's high compression, high temperatures are reached as those molecules are made to live in 1/17 to 1/20 of their "normal" space.

And, rather than wanting high intake air temperatures, diesels are equipped with a CAC (Charge Air Cooler) as cool air is denser (more molecules per cylinder full). Then they "squeeze" those molecules to raise the temperature for combustion.

And, yup, most use a turbo to force even more molecules of air (oxygen is the important part) into the intake and cylinder.