Thread: Fault Codes U2023 and P0087

Sounds like a dangerous attempt to find a solution. Your analysis of the valve would seem to be on the money. I guess that is why in the UK they have exchange pumps available.

Originally Posted by Ean Austral

No I haven't tried the turn off / on thing as its usually my wife driving the car so not game to tell her to try it.

That was my problem. It *was* the wifes car. She handed me the keys and said (not unjustly) "If you want to keep this piece of ****, *you* drive it, I'm done".

(the rantings of an inebriated fool deleted)

Originally Posted by BradC

That was my problem. It *was* the wifes car. She handed me the keys and said (not unjustly) "If you want to keep this piece of ****, *you* drive it, I'm done".

(the rantings of an inebriated fool deleted)

well after the last weeks effort I think I will be getting the keys to the D3 plus the bill for her new car if this don't get sorted soon.
Anyway the car is booked in to the local guru up here late this coming week with the instructions either find a issue quickly or replace the HPFP with the one I just bought. Was going to do it myself but just started a new job and am working the next 14 days straight and I think by then I will be about $50k poorer and looking at a new car in the driveway .

Cheers Ean

Originally Posted by Ean Austral

well after the last weeks effort I think I will be getting the keys to the D3 plus the bill for her new car if this don't get sorted soon.
Anyway the car is booked in to the local guru up here late this coming week with the instructions either find a issue quickly or replace the HPFP with the one I just bought. Was going to do it myself but just started a new job and am working the next 14 days straight and I think by then I will be about $50k poorer and looking at a new car in the driveway .

Cheers Ean

Was it the HPFP? I have the same issue and suspect some dirt ingress after both heads were rebuilt. Drives perfectly then when you’re just cruising it’ll fault with Low Fuel Rail Pressure. Stop, restart and it’ll either drive for 500 miles or 1 mile before faulting again.
I have one injector reading 1314 so out of range but can’t see that would throw a low fuel rail pressure fault. LPFP checked and new filter installed and still does it time to time.

Originally Posted by Rsys

Was it the HPFP? I have the same issue and suspect some dirt ingress after both heads were rebuilt. Drives perfectly then when you’re just cruising it’ll fault with Low Fuel Rail Pressure. Stop, restart and it’ll either drive for 500 miles or 1 mile before faulting again.
I have one injector reading 1314 so out of range but can’t see that would throw a low fuel rail pressure fault. LPFP checked and new filter installed and still does it time to time.

Eans been off the board for a break, but yes it was. I have his HPFP on my bench awaiting a teardown along with mine.

Originally Posted by BradC

Eans been off the board for a break, but yes it was. I have his HPFP on my bench awaiting a teardown along with mine.

Thanks for that. I’ve had several garages try to diagnose this without fail because they can never reproduce it. Don’t know if you know but could an out of range injector cause that error? And I’m left wondering what the garage did in the rebuild to break the HPFP like this

Originally Posted by Rsys

Thanks for that. I’ve had several garages try to diagnose this without fail because they can never reproduce it. Don’t know if you know but could an out of range injector cause that error? And I’m left wondering what the garage did in the rebuild to break the HPFP like this

Could have been nothing. I spent months diagnosing mine precisely because it was hard to reproduce, but eventually it got frequent enough I could watch it actually faulting in real time on the IIDTool once I knew what to look for. If the injector was spilling badly then I suppose in theory it could cause low rail pressure. I wouldn't bank on it though.

I got to the point I was driving through it. "Bing", off the accelerator, key off, key on, back on the accelerator. If you catch it early enough it doesn't cause cascade faults and I could just keep driving. Infuriating when it happens from every 10 to every couple of minutes on a 4 hour drive and you can't just pull over and set fire to it.

Rsys - Ean explained the eventual fix to his problem here:

Not sure if im unlucky or lucky