Hello, I bought a 2011 F250 6.7 powerstroke at auction. It is a really nice truck. When purchased I had a cylinder imbalance in #4. Going through the M pinpoint test, I discovered it was the fuel injector. After pulling the injector I discovered the IQA wasn't programmed into the PCM. Since I had ordered the new injector, I just replaced it and programmed the IQA. Now the truck won't start giving me a P2291 injector control pressure to low - cranking. I double checked everything. It's good. The only thing I did different from the M test was I don't have the equipment to do a relative compression test. I pulled all the glow plugs and did a manual on all the cylinders using a starter auxiliary bypass switch. With the engine cold I was getting at least 300 PSI on all the cylinders. I don't know if the bypass switch may have killed something. Back the M pinpoint test, I am getting plenty of fuel from the low pressure fuel pump and it's clean. I can pull up the pids and control the F_PCV and F_VCV but I don't know what the lowest duty cycle or highest duty cycle is and I don't know how to observe fuel flow from the left hand fuel rail. How does one do that? What is the lowest duty cycle and highest duty cycle? I changed out the Pressure control valve because it was the easiest. Still P2291. I took the intakes off and looked at the VCV, the screen was clean. I checked all the fuses, they were good. At this point I'm down to two components the volume control valve or CP4 pump. Can a CP4 pump fail non catastrophically?
Any help is appreciated.

 

Might want to get this moved to the 6.7 forum or ask it there

6.7L Power Stroke Diesel - Ford Truck Enthusiasts Forums

 

Thank you.

 

How many times have you cycled the key to let the fuel pump prime the system since replacing the injector? It is not uncommon to take 5-10 full pump cycles, only cycling the key again once the low pressure pump shuts off, before it will start. What is rail pressure reading while cranking?

 

I used the FPL_CMD pid to run the pump. I pull the fuel line hose after the engine fuel filter and to check the fuel and verify the low pressure side is working. I've cycled the key multiple times. It's primed. I wish the ford service manual gave more instructions on "how to observe fuel flow from the left hand fuel rail" and what the lowest and highest duty cycle value is. It will basically verify these valves but I don't know how to do that.
Be advised I moved this topic to the 6.7 Forum.

 

Clogged or dislodged orifice in left fuel rail

 

I got more responses from Powerstroke nation. To catch up go here.
(1) CP4 pump question | Page 3 | Ford Power Stroke Nation

 

Just had had same issue. Got bad rail from Ford. Replaced it again and it fired right up.

 

I found metal in the fuel lines so replace everything.

 

I did and still wouldn't start. P2291 Turned out that I got a bad new fuel rail from Ford and got another one and it fixed it. They sold me a defective one. Ugh.

 

So, the truck ran until you changed one injector? At that point all of the other things you did wasn't necessary. You caused the problem when you changed that injector. You need to go back over your work and see if you missed a wiring connector or didn't get something installed correctly. That being said it most likely is a fuel pressure problem from the lift pump. You probably have air in the system and until it's bled or cleared the truck won't start. Start with checking your work and then get the air out of the fuel rail.

 

If you're looking for what happened next you can find it here.
(1) CP4 pump question | Ford Power Stroke Nation