It all started two days ago was driving the truck when rail pressure spiked to 30k for 5-10 seconds, then back to normal for 5-10 seconds. The truck did this 4 or 5 times back and forth. I pulled over pulled the smarty tune out and entered a stock tune. The issue continued, high rail pressure for 5-10 seconds then back to normal of 6-7000. I shut the truck off and thought about what to do. Started the truck about 10 mins later and it magically was running great! No issues. I drove it home and drove it the next day about 30-40 miles.
Today I returned to my truck after lunch, started it up and high rail pressure again and knocking that comes with it. This time however it was not intermittent like before. I played with the cp3s connectors to make sure all where good and connected right. No change.
While it was running I unconnected the top pumps FCA and there was no change. I then unconnected the bottom pumps FCA and the idle got worse. So I figured it was the top pumps FCA.
I'm also getting some strange codes with this issue. All of the codes appeared when I removed the bottom pumps FCA connector. All the codes started when I disconnected the bottom FCA.
After I hooked everything back up the idle is so awful the truck barley runs and has erratic idle and white/black smoke. Sounds like a timing issue.
DTCs
Water in fuel.
I have the stock fuel bowl removed from the truck so this seems very strange.
Cp3 pump regulator control, map sensor voltage too low, sensor reference voltage 2 circuit low and accelerator petal position sensor 2 circuit low.
I tried replacing the FCA with a known good unit. Didn't fix anything.
I also tried disconnecting the rail pressure sensor. This actually returned the truck to a better idle but far from good or drivable. Rail pressure too high and those 5 codes.
Tomorrow I'm having a friend drop off a known good rail pressure sensor to try out.
Help!! Any ideas???
What are the syptoms of a bad rail pressure sensor?
Today I returned to my truck after lunch, started it up and high rail pressure again and knocking that comes with it. This time however it was not intermittent like before. I played with the cp3s connectors to make sure all where good and connected right. No change.
While it was running I unconnected the top pumps FCA and there was no change. I then unconnected the bottom pumps FCA and the idle got worse. So I figured it was the top pumps FCA.
I'm also getting some strange codes with this issue. All of the codes appeared when I removed the bottom pumps FCA connector. All the codes started when I disconnected the bottom FCA.
After I hooked everything back up the idle is so awful the truck barley runs and has erratic idle and white/black smoke. Sounds like a timing issue.
DTCs
Water in fuel.
I have the stock fuel bowl removed from the truck so this seems very strange.
Cp3 pump regulator control, map sensor voltage too low, sensor reference voltage 2 circuit low and accelerator petal position sensor 2 circuit low.
I tried replacing the FCA with a known good unit. Didn't fix anything.
I also tried disconnecting the rail pressure sensor. This actually returned the truck to a better idle but far from good or drivable. Rail pressure too high and those 5 codes.
Tomorrow I'm having a friend drop off a known good rail pressure sensor to try out.
Help!! Any ideas???
What are the syptoms of a bad rail pressure sensor?
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