Buna-N or Viton?

 

 

I think what he was saying it's that he built over 2k with the ICP sensor disconnected. Which means the computer is just showing default values. Doesn't mean he actually had 2k in the rails.

 

Yes, with the ICP sensor disconnected, there is no other means to measure the pressure that the HPOP is producing. So, the PCM goes into default value mode which will allow the IDM to fire the injectors.

Thank you for pointing that out again. I think that point has been missed several times which could still point to a bad IPR or improperly installed electromagnet, HPOP gear that is slipping on the HPOP shaft due to low torque on the HPOP shaft bolt, bad HPOP, or compromised o-rings on the injectors....listed from fastest/easiest to more time consuming/labor intensive/messiest.

Since there is no white smoke, is there fuel in the fuel rail in the heads?


-

 

Yes, only time i saw that number on AE was with the ICP disconnected.

No fuel is being injected, but i've got a mechanical gauge at the head and i have 55psi.

Blocking off the HPX tonight since it's a redundant system with an HPOP w/o a check valve.

Then replacing the IPR

 

Yes, I read many posts back that you have 55psi on a gauge.

I also read that you have a RR w FBD. Compressed air in the fuel rail will show 55 psi as well since the gauge cannot differentiate between fuel and air, hence, if there is no fuel and only air in the head then there will be no white smoke.

The reason that I ask if there is fuel in the fuel rails is due to the fact that some of ITP's RR's will require a manual purge/prime to remove the air from the heads. I have seen this on two occasions on two different trucks. One of them is in my signature. You actually have to disconnect the return line from the return manifold to remove the air from the heads. It will not build "fuel" pressure until you do this. I know it sounds hokey but, ITP told me that it does happen and they do not know why.

Even though you have only seen 250+ psi ICP with the ICP sensor plugged in, once the ICP sensor is unplugged and the PCM tells the IDM to fire the injector, that should be enough pressure for the intensifier piston to squirt some fuel into the cylinder "IF" there is some in the head.

Just pointing this out in case all else fails.

 

i have fuel coming out of the fuel return line...so it is making it through the loop.

and it didn't even try to fire with the ICP disconnected....so I either have a bad IPR or low oil pressure due to o-ring or hpop.

 

well, just did the air leak down test and no discernable air drop...about to do the IPR

 

I'll tell you about a mistake I made years ago. I had the tin nut on the ipr on backwards. The truck wouldn't fire. I turned the tin nut around and it fired right up.
Or.. ​​​​​I didn't have it tight to begin with and the direction didn't matter.

 

swapped IPR and still nothing

Bumped air pressure on Cody test to 150psi and it just spits it back out at me.

Any more ideas?

 

Did you put the nut on the ipr the same way you had it? Maybe try reversing it. I'm not at my truck so I can't tell you which way is correct, but reversing mine fixed a no start after replacing the ipr. Like I said maybe I didn't have it tight the first time. It may not matter but at this point it's worth a try.

 

i'll try anything at this freaking point

 

By any chance you didn't happen to connect the EBPV connector to the IPR? They are identical and can be a possibility.

 

lol, i did not. but i am open to every suggestion.

 

Ok, so no start after injector/hpop replacement hmm? I'm to lazy to read from the beginning lol... You filled the oil rails and hpop with oil? Is the 42 Pin connector connected in the right direction? Have you checked your oil level? Are the uvc harness connected? Are the batteries full charged?