Repost from Ford Truck forum.
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. I parked the truck in the driveway and went 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.
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. I parked the truck in the driveway and went 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.