Captain Touchdown
New member
Hello all,
I’ve been a longtime reader of the forums as I fix odds and ends on this vehicle I purchased from a local used car lot in 2020. No clue what the maintenance history was like, it sat on the dealer’s lot for over a year and was picked up at a big auto auction. I don’t know what the status is of the emissions fix, but I assume any warranty associated with that would be expired.
I’m having a fuel issue that I’m having trouble figuring out. I am getting intermittent P0087 low fuel rail pressure codes and the vehicle drops into limp home mode. Sometimes every 10 miles, sometimes I’ll go 100 miles without it. There’s also a hydraulic-sounding whine coming from under the hood when it happens. I actually thought it was a failing power steering pump the first time I heard it due to the specific sound. However the sound does not change in pitch when turning the steering wheel or raising the throttle.
If I pull over and let the car rest for a minute then restart the engine and start driving it is completely normal until the next time it throws the code. I’ve taken to using my basic Wi-Fi ODB code reader (I don’t have VCDS) to reset the fault codes when it happens so I don’t have to pull over and wait to restart the engine. Doing it this way doesn’t seem to have any affect on how often it happens. My anecdotal experience is it happens more often in the heat, but I also don’t drive it out of town much in the winter so that could also be the reason I notice it less.
After searching the forums and looking around online extensively I’ve done the following:
First, I replaced the fuel filter and found no metal shavings and no other debris.
Second, I replaced the fuel metering valve on the HPFP and checked for metal shavings in the HPFP. Also no debris there.
Third, I have tried tracing the source of the hydraulic whine and it seems to be emanating from one of the lines coming out of the fuel filter.
At this point, I’m not really sure what to do. None of the posts I can find mention any kind of noise like I’m hearing. It doesn’t seem like an HPFP failure so I don’t want to go through the labor and expense of replacing it unless that’s almost certainly the problem. I’ve heard about restricted fuel flow causing issues, but I’m not sure how to diagnose that.
I would appreciate any kind of troubleshooting tips you can offer, and I would be happy to provide more information if it would be helpful. Thank you!!
I’ve been a longtime reader of the forums as I fix odds and ends on this vehicle I purchased from a local used car lot in 2020. No clue what the maintenance history was like, it sat on the dealer’s lot for over a year and was picked up at a big auto auction. I don’t know what the status is of the emissions fix, but I assume any warranty associated with that would be expired.
I’m having a fuel issue that I’m having trouble figuring out. I am getting intermittent P0087 low fuel rail pressure codes and the vehicle drops into limp home mode. Sometimes every 10 miles, sometimes I’ll go 100 miles without it. There’s also a hydraulic-sounding whine coming from under the hood when it happens. I actually thought it was a failing power steering pump the first time I heard it due to the specific sound. However the sound does not change in pitch when turning the steering wheel or raising the throttle.
If I pull over and let the car rest for a minute then restart the engine and start driving it is completely normal until the next time it throws the code. I’ve taken to using my basic Wi-Fi ODB code reader (I don’t have VCDS) to reset the fault codes when it happens so I don’t have to pull over and wait to restart the engine. Doing it this way doesn’t seem to have any affect on how often it happens. My anecdotal experience is it happens more often in the heat, but I also don’t drive it out of town much in the winter so that could also be the reason I notice it less.
After searching the forums and looking around online extensively I’ve done the following:
First, I replaced the fuel filter and found no metal shavings and no other debris.
Second, I replaced the fuel metering valve on the HPFP and checked for metal shavings in the HPFP. Also no debris there.
Third, I have tried tracing the source of the hydraulic whine and it seems to be emanating from one of the lines coming out of the fuel filter.
At this point, I’m not really sure what to do. None of the posts I can find mention any kind of noise like I’m hearing. It doesn’t seem like an HPFP failure so I don’t want to go through the labor and expense of replacing it unless that’s almost certainly the problem. I’ve heard about restricted fuel flow causing issues, but I’m not sure how to diagnose that.
I would appreciate any kind of troubleshooting tips you can offer, and I would be happy to provide more information if it would be helpful. Thank you!!
