crdcr8z wrote:
Now my stupidity has manifested itself. I was so sure that I had a computer problem that I spent too much time chasing the wrong things. I probably always had those glow plug problems. I would bet that someone changed 7v plugs out for 5v ones at some time and this has always been reported. At any rate, I did what Sam suggested and cracked the fuel rail after cranking and got very little fuel. I ran to Oreilly's and got a new filter and stuck it in there, primed it and tried again, - no dice. So i disconnected both rubber lines from the fuel filter assembly and cranked. No fuel came out anywhere! I am not sure which is the in and which is the out but I unhooked the one nearest the driver side first which I believe is going to the fuel rail, - nothing. I then unplugged the other one nearest the passenger side and the same - nothing. When I primed, I must have been sucking the fuel in, but when running, there wasn't any being fed. I guess I have a bad fuel pump. I have been plagued in the past with bad pumps on diff cars. I should have known. It's in the tank too - great... I noticed that there is a fuel injector pump too. Shouldn't I be getting fuel fed to the fuel filter head regardless of that injector pump or could it be part responsible for sucking the tank dry?
I understand your frustration. The collective here can help. But it will be one step at a time. Based on your comments I do not think the glow plugs are an issue.
These jeeps didn't come with a intake fuel pump, the high pressure injection pump sucks fuel all the way from the tank.
Can you put back in the original ECU, clear codes, and see what codes come back?
Does your code reader allow you to read sensor data such as the fuel rail pressure?
I took a video tonight of my spare engine to give you some more information. I hope it helps. Consider replacing the crank sensor, but if possible do some wiring continuity checks with a multimeter between the sensor plugs and the ECU.
I know its a little long but I think there is some good information to help you learn the CRD engine control, maybe nothing in it is the actual problem you have, but it might help you get a little more background on the engine.
https://youtu.be/AvC0ytEsQ6wYou can download the service manual here:
http://colorado4wheel.com/manuals/Jeep/KJ/In it you will find wiring diagrams and pinouts, this will tell you which pins you can check for continuity, and also which pins to check at the sensor for power or ground.
Wow! Fantastic Video. You've given me a lot of things to try. I will check that fuel is coming from the injection pump and test for fuel pressure first (After priming again). I have replaced the cam position sensor so it is likely not that. I will have to find the pins for the crank sensor if the fuel is not an issue.
Its going to be colder for the next several days so I hope that the glow plugs are working! Oh and BTW, my OBD II tester is as cheap and generic as they come. Perhaps I should get a better one or borrow one. Mine only shows DTC codes and that's it. I had tried the original PCM after clearing codes and the glow plug codes came back and the P0610 but that is all.