I just finished replacing the CP3 and now it won't start. Actually it will start but dies right away, if I try to start right away it will just crank, if I let it sit about 10 seconds it will start and die. I have a lift pump that keeps the filter pump hard, but when the pump is off the pump will not get hard no matter how many times I pump it. Fuel comes out of the schrader(sp?) valve. So all that sounds like a leak, right? But everything looks dry, no diesel smell, never touched the filter assembly, and I would think the lift pump would pressurize all of the low side plumbing, yes? I checked for codes and came up with po206(cylinder 6 injector circuit problem), po208(cylinder 8 injector circuit problem), p1261(Injector Voltage control circuit group 1), p1262(Injector Voltage control circuit group 2). Don't know much about the circuitry - I read someone had the same codes and it was a connector but they weren't very descriptive about where/what. There is a 4 wire (I think) plug behind the alternator that was a pain to disconnect with something very similar on the other side of the motor that was also very difficult to disconnect. I poked around the one behind the alternator but it looks well seated - but I don't know if this is part of the injector circuit or not. I cleared the codes and tried starting again, same start die and same codes came up.
I changed the pump due to increasingly low rail pressure demand verses delivered. Also my crank case filled with diesel - I have read cracked injector but also could be CP3 and since I knew the CP3 was going bad I decided to start there. I would think even if it was an injector leaking the truck would start after the pump change out because it seemed to start/run fine beforehand. I suspect the diesel in the oil was gradual instead of all of a sudden because I noticed the oil pressure being a little low over a long (200 mile trip) and then overflowed on the return trip home - didn't notice until stopped and unloading the trailer. Injectors have about 30K miles (done by shop before I bought the truck), truck has about 175K.
Would a bad electrical connection cause not being able to pump to prime? Doubtful - but no leaks that I can see and no fuel smell. Wouldn't the lift pump keep enough flow/pressure to start/die repeatedly instead of needing to wait 10 seconds?
Any thoughts? I did read a post that had the exact same symptoms (the starting part - they didn't list any codes) but that was from 2009 and no resolution was posted.
If you suggest a connection please be descriptive as I am not very knowledgeable about the acronyms, etc.
I changed the pump due to increasingly low rail pressure demand verses delivered. Also my crank case filled with diesel - I have read cracked injector but also could be CP3 and since I knew the CP3 was going bad I decided to start there. I would think even if it was an injector leaking the truck would start after the pump change out because it seemed to start/run fine beforehand. I suspect the diesel in the oil was gradual instead of all of a sudden because I noticed the oil pressure being a little low over a long (200 mile trip) and then overflowed on the return trip home - didn't notice until stopped and unloading the trailer. Injectors have about 30K miles (done by shop before I bought the truck), truck has about 175K.
Would a bad electrical connection cause not being able to pump to prime? Doubtful - but no leaks that I can see and no fuel smell. Wouldn't the lift pump keep enough flow/pressure to start/die repeatedly instead of needing to wait 10 seconds?
Any thoughts? I did read a post that had the exact same symptoms (the starting part - they didn't list any codes) but that was from 2009 and no resolution was posted.
If you suggest a connection please be descriptive as I am not very knowledgeable about the acronyms, etc.