Hmmmm, may need a bit of help with this one, this vehicle arrived at our workshop running but very low on power, code p1190 present, fuel pressure issues, low pressure reading about 3.9 bar, measured voltage on centre pin on pressure sensor on rail, 2.7v running at 3500rpm, almost 1v low according to auto data.
Carried out leak off test on injectors, no. 4 seemed excessive when running, about 30% more than others, tried leak off just ignition on, some fuel leaking off in this test although very minimal.
Anyway we have now replaced 4 injectors, code promptly returned when driven, starts well, runs slightly unevenly.
Any help here would be appreciated, thanks, Phil.

Phil, I read one of frank Massey's articles about a fuel pressure issue with these vehicles and there seems to be an up graded wiring harness fuel pressure sensor and "O" ring to cure EMI (Electro magnetic interference) issues, these are well known to Land Rover. I don't know if it applies to your problem but maybe worth a check.

Mark

Hi Phil,
Is the low pressure pump working ok ?

Regards
Dave

Thanks for these posts, have heard about wiring harness, chap I know who worked for l rover recently said they used to pinch connector a bit tighter on pressure sensor on rail, he thought harnesses were unnessarsary....?
Is the O ring in the regulator on the pump?
thanks for help Mark.
Dave, good question, solus reads this at 3.9 bar, I have renewed the fuel filter (inner wing osr), and you can hear the pump running, it had enough pressure to create small leak off when not running, hence injector change, it also carried out self bleed sucsesfully and started well after injector change.
New injectors fitted now leak off evenly but not dramatically different from old ones.
Thankyou for all help so far, Phil.

According to info from landrover teccy and from other sources, there should be no leak off from these injectors in disabled state and cranking, these recon units do leak, about 1cm up leak off test tube with 10 sec cranking.
What do you guys think? Is this excessive leak off? Are these injectors knackered from the start?
Thanks for reading , Phil.

Hello Phil,
I usually measure injector spill with the injector wiring disconnected & cranking for 30 secs & have yet to see one that doesn't spill any fuel.On my measuring tubes I usually see 3-4(about the same height as you're getting I would think) graduations after 30 secs cranking & usually look for a difference between cylinders. Usually an injector causing a problem starting(not the problem you have) will spill off an obviously greater amount than the others. When cranking usually the high pressure should be around 250-280 bar & when held at approx 2000rpm, approx 700- 800 bar. You would expect to get a max of about 1450 bar viewing live data on road test at full load.
Your low pressure sounds ok at 3.9 bar , usually they are around 3.6-4 bar.
Have you got a better description for your code as I don't usually see the "P" code using Autologic.I will see if I can find time tomorrow to check the description.
I have yet to replace an overlay harness & have always managed to clean up the rail pressure sensor connections, tighten them & refit ok, but after also reading Franks' article in Aftermarket magazine, it does make me wonder whether there is more to replacing the loom, than just corrosion as the L/Rover TSB suggests.
I have had my suspicions about the quality of remanufactured injectors lately & have recently had an issue with some that tested fine twice(with the starting fault still apparent) & 3 out of the four have been fitted to other vehicles since with no problems(not by me), yet the starting problem was sorted when I fitted a genuine set of Bosch factory reconditioned injectors.
Hope this helps, Regards, Andrew
p.s It might also be worth checking to see if there is anything floating around in the tank, that could possibly restrict the pick up, but a pressure drop should be noticeable on dynamic data when road testing if this is the case.

Have since been in touch with Electrotec, the firm that supplied these remaned bosch injectors they feel injector leak off described to be acceptable, I dont seem to be able to test high pressure side with solus, imagine that this would not benefit me a lot as it would either read percieved pressure as read through rail sensor, or actual pressure if this is low.
What I need is a guage capable of reading these sort of pressures with a connector suitable for rail pressure sensor thread.
Electrotec suggest testing the high pressure pump, pump off, send off, £132 please.
Ill have a look at code description tommorow. Thanks for post Andrew,
Phil.

Sorry about delay reposting.
Best description so far for this code p1190 is, "rail pressure control"
Had to go on breakdown about 120 miles away yesterday hence no progress beyond this yet, what symtoms have you had when fitting wiring looms to rail sensor?
How about high pressure pumps?
Any help welcome, thanks, Phil.

Hi Phil

The overlay harness repair I am sure is to get the sensor wire away from the injector wires that are in the loom, had one the other day that had a new rail sensor with a new harness end spliced on the end of the old loom, Still had rail pressure faults & poor driveability put a new harness in as L/R advise in the TSB & fault fixed

As for high pressure testing you should be able to determine the status of the h/p pump by scoping with frank massey test, also can test blind pressure with a sykes or delphi guage.

Hope that helps

Pete

Hi Phil,

We had one in a few weeks ago, it would only rev up to about 3000rpm max, what we done was, we held the revs @ maximum revs(3000), and hit the fuel tank & the revs raised up, diagnosing fuel pump faulty, fitted new pump,fixed.
just a thought.
john

Thanks for all replies, including Tony who rang me up.
Took drv out of rear of high pressure pump, noticed quite a lot of wear on valve behind rubber o ring.
Have spoken to guys at Electrotec who suggested testing pump as I mentioned in previous post, not sure what you mean by blind pressure test, Pete.
Can landrover dealer tool give actual pressure, or is this again only what is percieved by the rail switch?
Must get back onto this one this week as it has been with us some time now, thanks for all replies, loking forward to some good news soon, Phil.

Hi Phil,
the vehicle should be fitted with a Bosch CP1 system.

There is no "valve" behind the "0" ring on the DRV.

The "valve" for want of a better name is inside the nose of the regulator.

The "0" ring is there to stop the fuel going past it. The Inlet to the "valve" is in front of the seal (there is a fine filter on the nose)

Fit a new seal and support washer to the DRV and re-fit it. Take care with the filter.

Crank the vehicle with the electrical connector removed from the DRV and record the rail pressure. Then re-connect the plug and start the vehicle.

Again record the rail pressure at idle and the duty cycle of the DRV.
Record rail pressure and duty cycle at three different RPM ranages finishing off with a good rev to full governed speed again recording the max pressure and duty cycle.

Post the results and we can help from there. HTH

Regards Mark

Thanks Mark, will do, but Im not sure I have can read duty cycle of drv on solus, may have to get some help with that reading, Ill see what I can do. Thanks again, Phil.

Heres a thankyou to everyone who contributed on this one, this has been a bit of a reality check here, bringing me to realise that just my solus alone is really quite inadequate in some situations! (Scope?).
Also an apolagy for not posting this on friday, this one turned out to be the high pressure pump, we took some advice from local landrover dealer who reccommended the rail switch and harness as it will be required one day anyway, well now it wont!
Once again thank you to all who read, pondered and replied!
Phil.