Hoky doky. So the fault has gone from once every couple of hundred Ks to several times a day, so I hooked up the low pressure gauges and went for a drive.
Sure, it never sees more than 0.4 bar and mostly hovers about 0.3, but it never budges even when faulting. I see that as conclusive evidence it's not the low pressure system.
Now, I've been watching the pressure and volume valve percentages along with the rail pressure. If I'm watching the iPad I can stop it faulting. Just before it faults it winds the pressure valve open past 50% and it has to stay there for 2 seconds before it faults. As soon as I see it spiking I just get off the pedal and back on again. The sudden drop when I get off the pedal frees up whatever is sticking and it's all good.
I take that as conclusive evidence the fault is in the HPFP ( yeah I know you all said it was months ago ). If I could source a pressure control valve, I'd replace that first just as a test, but they don't seem to be available.
Bookmarks