It's not that simple. You are not moving control collar directly!
It's the ECU that decides to move control collar and set desired RPM. By moving top of the pump you only alter minimum and maximim achievable fuelling. But if you go beyond limits, then the ECU has problems with controlling fueling.
Done that many times(on Range Rovers and BMW), idle RPM never moved during adjustment procedure.
If you are moving the top back and forth you are moving the control collar. The idle control is trying to adjust to the new fuel setting as the control collar is moved and increasing or decreasing fuel to try an maintain, in the case of the P38 750 RPM. Only when the top is in the correct position as set when the pump was calibrated and a solid 750 RPM is achieved will it stop doing that. Simple thing with a diesel is if you increase fuel it revs up if you reduce fuel it slows down.
I would also add, that diesels have tendency to runaway with constant fuel rate and low load, thats why injection pump governors were introduced years ago.
In fact, those electronic pumps are very simple, far more simplier than those with mechanical/hydraulic governor.
Just set hot engine fuelling between 4-6mg/stroke and if fuel temperature sensor is working as it should, it will be ok.
In fact, those electronic pumps are very simple, far more simplier than those with mechanical/hydraulic governor.
Just set hot engine fuelling between 4-6mg/stroke and if fuel temperature sensor is working as it should, it will be ok.
EDC were the early ones with potentiometer(fuer return facing upwards on top cover) - discontinued somewhere 1995-1996 - it wasn't repairable once potentiometer traces worn, new pump top not avalible anymore, even at BOSCH.
HDK with fuel return facing backwards. Mine is MY98 and its HDK pump top.
Don't know why, but RAVE does not cover HDK version.
HDK with fuel return facing backwards. Mine is MY98 and its HDK pump top.
Don't know why, but RAVE does not cover HDK version.
Different way of controlling the fuel servo as far as i am aware. Not gone into HDK overly not needed to.
did you ever sort this ?Hi all can anyone help I've recently bought a automatic p38 with the 2.5 bmw engine and noticed it seems very slow to accelerate in first once turbo kicks in she's fine also very slow in reverse I left a friends work shop today he's at the bottom of a slope and rangerover would not go up it in reverse it started to but stopped even with my foot hard to the floor it wouldn't move had to spin around and drive out I know they aren't fast but old ladies in mobility scooters are beating me of the lights power steering pump has died Aswell !!!! Any advice cheers will from Norwich
