Updates.
Blue dci is running again. Plugged in the new fuel rail pressure sensor which cleared the df127 and live data showed correct readings with engine off. Also ac pressure registers 3.5bar again now the sensor is receiving correct voltage.
Changing the rail sensor looked to be easy and i was expecting it to be a 10 min job. I managed to remove the old sensor in situ which was easy enough but could not get the new one to start in the threads and couldnt even get the old one to go back in. I ended up unding the diesel pipes and taking the fuel rail off to do on the bench. No pics but rust had wicked up the threads in the fuel rail causing the first few threads to gall slightly on removal. I was quite suprised to see this as it had came out quite easy. The thread is not standard, looks like an thread or similar and you cant get any swarf in so retapping is a no go really. With this in mind i got the old sensor and got it started in the thread, working it forward and backwards which recut the leading threads letting the sensor wind in easy. Had to be careful keeping everything very clean as these delphi setups s**t themselves at any dirt ingress.
New sensor went straight in and refitted the rail/fuel lines. After an extended crank of the starter to prime the system it fired up sounding absolutely normal.
Logged rail pressure on a couple of starts and all good. Ive noticed with engine off, ign on the new rail sensor reads 0bar where the old sensor would linger between 12-30 bar for whatever reason (doubt this was correct as never any residual pressure in system) so might have been on its way for a while.
Anyway test drive went fine, goes normal no issues. Ive started it up a load of times and it runs much better, no low idle or surging on idle so do wonder if the rail sensor was contributing to all of this with iffy readings as never managed to log the fault with it been intermittent.
Orange clio has a full tank of diesel in so will be using that up before the blue one is back in daily use.
Thanks for reading!!
