Ok.
Check the O-ring. Any leaks are bad. The injection are balanced with the air measurement.
All power is cut off from the engine when vehicle is set for sleep mode. However: Operating an door will wake ECM up and it will start preparing for a start.
Yes. Battery are safe to remove without issues. I do so as a habit when working with any electrics. (and i used to own 607 on past...Not the easyest vehicle for battery remove)
On x351 major settings are stored on non-volative memory. You lose time/date and might need reset windows for one touch close/open.

 

Hello, I measured the fuel pressure at 7700 kPa, or 77 bar: this is insufficient to start the engine.
I think it should be at least 250 bar! The injector clamps are tightened to 10 Nm as indicated in the technical manual:
is this the correct value?I cheked all intake gaskets 👍

 

Should be fine for starting.
Here are the fuel pressures from Jaguar 5.0L engine manual.



So nowhere near 250 bar!!
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Ohh.. I misread your earlier value. For injector to operate the min fuel pressure is 150bar. 77bar is not enough. Check fuel pressure regulator, fuel pressure sensor and wiring. Low pressure pump (inside of fuel tank) are capable only about 0.5bar, so you seem to have some pressure from high pressure pump. Maybe some dirt ended to pressure control valve?
The injector clamps are Ok with 10Nm. They are not tight.
The high pressure side have 2 electrically controlled valves. Check wiring.

This is text from x351 service and repair manual:

HP FUEL PUMP
"When the HP fuel pump is rotated, pressure is created when the volume control valve is open and the pressure control valve is
closed. Both valves are electronically controlled by the ECM to allow variable fuel delivery and pressure control. When the ECM
actuates the piezo actuators, the fuel rail pressure drop is off-set by additional fuel being delivered to the fuel rails by the
pressure control valve. The fuel pressure in the system is reduced within a few seconds after the engine has stopped as the
pressure control valve no longer has the holding current it requires, and therefore opens. No residual pressure remains in the
system and the fuel is returned to the LP fuel return line to the fuel filter through the open pressure control valve."

"The pressure control valve is located in one of the fuel rails. The fuel pressure is monitored by a pressure sensor located in the
other fuel rail. The ECM controls the pressure control valve using the received signals from the pressure sensor. Reducing the
pressure in the fuel rails via the pressure control valve results in fuel returning from the fuel rails to the LP fuel return to the
fuel filter."

When looking engine from front of the vehicle: Fuel pressure control valve on right rail. Fuel pressure sensor on left rail.

 

Very informative, I'll test the wiring of the solenoid valve and the sensor tomorrow. Thanks

 

He have an 3.0L Diesel. Totally different pressures.

 

I checked the wiring, bled the air from both sides,
and the pressure doesn't exceed 80 bar. Where can I find the inertia switch?
Thanks

 

As far for known the x351 do not have such an inertia switch like previous models. The ECM cut the power from fuel pump if any airbagks deployed. Reset is then made by SDD. (i guess)

 

The car just started, thanks for all your advice.
The problem was, shame on me, an inaccessible rail nut that was a few degrees too loose.
I had checked for diesel leaks, but they were very small and almost invisible under the nut!
Once tightened, the car was a little difficult to start, but everything seems okay.I can now help those who would like to get started

 

Great news. Sometimes they are hard to find.
Thanks for reporting back here.

 

Sorry I missed it was a Diesel.
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HelloA small question is bothering meI read that Chinese plastic parts are very fragile and break easilyAre Chinese aluminum manifolds a good idea if my part breaks again?They cost €160 for the pair!!

Thanks

 

Alumium ones are much better, practically a must if you increase the boost pressure by tuning, but they are bit noisyer. Expect to have more engine noise.

 

I don't plan on increasing the pressure; it suits me perfectly as it is!
Maybe I'll just remove the EGR valves for peace of mind, but nothing more.
Thanks for the information on the aluminum manifolds; I'm hesitant to order them before the taxes that are coming on Chinese products 😐

 

Yes. I feel too that 3.0D is well suitable for x351 as it is by factory. Plenty of low end torgue make XJ moving effortlesly in any situtation..

Don´t remove EGR:s. You do more harm if you do so. EGR:s are only open when engine is running on "lean" for cooling down the combustion chamber / pistons. (replacing oxyden) On "lean" mode the particle generation is very low, so the intake sooting is very low. Engine is running "lean" mode on idling (after about 1min) or in highway cruising.
If you use recommended low ash C1 engine oil and change tnem about 10t km intervals, the intakes should be clean from soot even +340t km. (i have 340t km now and intakes are clean) When EGR:s are removed the combustion chamber / pistons will run much higher temp on "lean" mode. By oil cooled pistons (oil jetting under pistons) the engine oil can start cooking under pistons.

There are absolute no effect for the power or fuel consumption by removing EGR:s. (EGR:s open only on "lean" mode)
Off course if EGR:s have failed or stuck open its different story an they need to be fixed.