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  1. F

    High Fuel Rail Pressure

    I went back to the stock tune, and it was still having the same problem. The FRPS is the OEM one. You bring up an interesting point though. I looked back at the data again, and most of the time the fuel rail pressure consistently increases but I haven't seen it go above 65 PSI yet (or maybe I...
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    High Fuel Rail Pressure

    Thanks for the response! I verified that everything in the fuel system is mechanically working properly by hooking up a physical fuel pressure gauge, using a multimeter on various components, and monitoring/cross-referencing the live data. The O2 sensor codes appear to be from an actual rich...
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    Sorry man, I just saw this. I posted my reply under the thread but basically, I don't know what...

    Sorry man, I just saw this. I posted my reply under the thread but basically, I don't know what to do either.
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    High Fuel Rail Pressure

    I tried erasing everything and going back to stock but it still did the same thing.
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    High Fuel Rail Pressure

    No other update, I don't know what to do either. The PCM asks for higher fuel rail pressure when the fuel rail temperature increases, which is because the engine temperature increases (even if it stays within the normal range), which just seems inevitable. It seems the only way to stop getting...
  6. F

    High Fuel Rail Pressure

    Update: it looks like the increasing desired fuel rail pressure is a programmed response to increasing fuel rail temperature. The desired fuel rail pressure starts increasing when the fuel rail temperature hits 84 degrees Fahrenheit, and the relationship between a specific fuel rail temperature...
  7. F

    High Fuel Rail Pressure

    Thanks for the resource! I gave it a look over, but I couldn't find anything that fits my specific situation. I'll try to break each point down (I'll ignore all the lean sections as the engine is running rich) and please let me know if I make a mistake anywhere. Using the LONGFT1 and LONGFT2...
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    High Fuel Rail Pressure

    I hooked up a physical fuel pressure gauge, and it confirms that the FRPS is working properly. I really don't know what else to do from here.
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    High Fuel Rail Pressure

    So, I was able to get a bit more data and it looks like as the car warms up, the PCM increases the desired fuel rail pressure from 40 PSI to 60 PSI over time, which increases the fuel pump duty cycle, which increases the actual fuel rail pressure according to the desired pressure. I also checked...
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    High Fuel Rail Pressure

    I believe the fuel pump is fine because I put a new one in and the same problem was happening. I will be getting a fuel pressure gauge soon though for more testing. I also forgot to mention that the duty cycle values I mentioned are what the PCM are sending to the FPDM, which is actually half of...
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    High Fuel Rail Pressure

    I believe it has an S&B cold air intake, catalytic converter deletes, and Screamin' Demon coil pack and spark plugs done by the previous owner. By the way, I believe the negative fuel trims and high fuel pressure indicate that the car is running rich and I can smell the gasoline smell getting...
  12. F

    High Fuel Rail Pressure

    So, I did some more testing, and it looks like all of the original parts and wiring were working correctly. For some reason, when the car is cold started the fuel rail pressure and fuel pump duty cycle start at 40 PSI and 14% respectively (which I believe is normal), but after idling for a...
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    High Fuel Rail Pressure

    If I were to try physically testing the fuel rail pressure with a separate gauge, do you know how I would go about doing that?
  14. F

    High Fuel Rail Pressure

    Aftermarket.
  15. F

    High Fuel Rail Pressure

    I have a 2006 Ford Mustang V6 with 200k miles. When idling, there is a strong fuel smell outside the vehicle (no smell inside though). Engine sometimes idles roughly (RPMs dip and rise) and may stall. When engine is idling rough, exhaust occasionally emits liquid (appears to be fuel) and the...

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