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You need to ensure that here are no vacuum leaks in the line from the tank to the lift pump, the lift pump which looks very similar to a car petrol pump must be in good working order ie able to pump the minimum pressure and volume at cranking speed and idle speed. If the lift pump is not working properly it will cause cavitation at the injector pump that will cause low pressure bubbles on the intake of the injector pump. If you have a good lift pump and there are no vacuum leaks between the tank and the lift pump then it may be down to bleeding the air out of the injector lines first at the pump, and then at the end of the injector lines (be very careful the diesel is at 170 to 175 times atmospheric pressure which is about 2500 pounds per square inch (which can penetrate skin deeply and even bone). Most of the Ford tractors use a rotary injection pump. Having only one cylinder not pressurizing is extremely unusual, try swapping the injectors between cylinders to see if it is a faulty injector, making sure to use new or at least anneal the old copper sealing washers and tension the injectors evenly with a tension wrench to correct torque. If the misfire then follows the injector it means your need the injectors servicing. New needles & nozzles for injectors is a lot cheaper than a new or rebuilt rotary injection pump. Please advise if it’s an inline pump. (which I doubt they were rare because they cost more).
I cant give you an exact date but it is from the early 70s. That is when they were yellow. My educated guess on this is 1973. If you go to a Massey Ferguson dealer with your numbers they will gladly tell you what year it is exactly.
cam ? timing? or the injector pump... ??????
ask Isuzu for a book.
wiki says, what is a space cab.>?? a 4,000 lb truck./van, sure.
The 4BE1 is a 3.6L direct injection engine. It replaced the 4BC2 in Isuzu NPR's from 1987- non turbo, VE rotary injection pump or Zexel/Diesel Kiki A-type injection pump. Bore and stroke are both 105mm. Power ratings in the last versions (NKR300)are 74 kW (100 SAE HP) at 3,500rpm and 242 Nm at 2000rpm.
You can reset the immobilisor with the key ,you should have the code in the handbook ?? you turn the key so many clicks to the right and left as per the instructions in the book ,Depending on the year its possible to bypass the little electronic lock inside the housing on the injector pump ,but you may need to remove the injector pump to do this ,then remove the shroud thats held on by bolts with the heads sheered off ,inside their is a valve ,now toy will have 3 wires in the loom to the pump and one is a 12v supply via ignition switch and you will need to remove the shroud and run this wire direct to the solonoid valve bypassing the funny little electronic gizmo type thingy .Very good at this i dont even know the proper name but i do know how to do this trust me ,another way which i wouldnt recoment is to use a radial cutter on the top part and then pull the wires out with a hookey type home made tool but it is very difficult to do and i would advise you to remove the injector pump and just leave the shroud off
You've done a great job of trouble shooting thus far. I would certainly suspect the injector after all of that. But, I didn't see anything about you replacing the spark plug itself. I would try that first as a crack in the insulator (even hairline) will cause mis-fires. If the spark plug doesn't fix the mis-fire, it cold be caused by a bad fuel injector, bad signal (like a loose harness or bad wire) to the fuel injector, or a leak or valve issue on that cylinder.
Can you check fuel trims at idle and under load?
If fuel trim is high at low speed and load, look for a vacuum leak.
If fuel trim is high at high speed and loads, look for fuel volumn problem or restriction.
If fuel trim is high at all speeds and loads look for pcm input fault, maybe a maf sensor problem?
If fuel trim is negative low speed and load, look for fuel pressure regulator or injector leak. If fuel trim is negative at all speeds and loads check ect and iac.
If you have the spider fuel system, that system is noted for problems. key on engine off, 60--66 psi fuel pressure.