Search results

Search the forum Search Articles
  1. D

    Negative Desired Fuel Rail Pressure

    Appreciate it Ron. Will be spending this week on testing and will ensure I post back with updates. Appreciate the perspectives from all. :drink:
  2. D

    Negative Desired Fuel Rail Pressure

    ahhh gotcha. Just ran stock time test drive and bottle test at the same time. Zero fuel in the bottle so it’s not blowing off. Think that further confirms your theory on the sensor.I haven’t reviewed the log yet but it is also strange that the edge reflects what appears to be different numbers...
  3. D

    Negative Desired Fuel Rail Pressure

    ahh I thought you were talking valve. Good call on the sensor. Any idea where it is?
  4. D

    Negative Desired Fuel Rail Pressure

    it sure does. Sounds like mixed reviews on the race plug. Thinking of shelling out for a single stage. Still wouldn’t explain why the actual pressure is so much higher than demand, would it??
  5. D

    Negative Desired Fuel Rail Pressure

    Will do the same drive on the stock tune tonight and report back. I have been eyeing the FPR all day and from what I can tell it is just the one located on the CP3, right? Is there one also on the rail in the LMM? Tons of videos on LBZ and LLY, but cant find much for LMM. As I am reviewing the...
  6. D

    Negative Desired Fuel Rail Pressure

    They do track with each other in relative terms, however actual is ALWAYS higher than demanded, sometimes by 1,000 (idle), sometimes a whole lot more. Also, for what it is worth I do not experience the hissing and hesitation unless I am at reasonable temps and WOT, or if I am hot and over 50%...
  7. D

    Negative Desired Fuel Rail Pressure

    Hello, I have a 2008 6.6L LMM drivetrain with 140k miles (it is a converted 2007 suburban 2500). When I accelerate hard the fuel rail demand is dropping to a negative number, in the attached example it goes from about 9k demand to -8k demand. I also noticed that even in WOT the demand never...
Top Bottom