range rover l322 2003 td6 fuel rail pressure plausibility

shaneannigans · Jan 15, 2020

Hi I'm new to landyzone, hoping that someone can help me with my issue,
I can drive for miles with out a problem, but if I stick my foot down to overtake i get the dash fault come up, I have a icarsoft, when I plug it in it comes up with, Fuel rail pressure plausibility, once reset it's fine,
This is driving me mad,
Any advice would be greatly appreciated

kds · Jan 15, 2020

Sounds like one of the transfer pumps aint playing the game, I know not which one though.

shaneannigans · Jan 15, 2020

kds said:
Sounds like one of the transfer pumps aint playing the game, I know not which one though.

Thanks for your reply, but I changed all pump a year ago as it wasn't running, I've also done one injector, but it never come up with this fault.

gstuart · Jan 15, 2020

Hiya

Just a thought , Have u fitted a good quality fuel filter not a cheap one

is the MAP sensor clean

what fault codes have u had plse

gstuart · Jan 15, 2020

Also isn’t there near the leccy pump a T piece which they think has some type of valve in it ?

Saint.V8 · Jan 15, 2020

Check for injector leak off issues or the fuel regulator O ring goes brittle causing a drop in rail pressure when high demand is required.

What does the iCarsoft live data say the rail pressure is when you put your foot down, does it rise nicely or rise a little then struggle to get much higher?

shaneannigans · Jan 16, 2020

gstuart said:
Also isn’t there near the leccy pump a T piece which they think has some type of valve in it ?

Not sure about that, but I will look into this,
Thanks for your help

shaneannigans · Jan 16, 2020

Saint.V8 said:
Check for injector leak off issues or the fuel regulator O ring goes brittle causing a drop in rail pressure when high demand is required.

What does the iCarsoft live data say the rail pressure is when you put your foot down, does it rise nicely or rise a little then struggle to get much higher?

When I put my foot down, is near instantly & goes into a limp mode.
Thanks for your help

shaneannigans · Jan 16, 2020

gstuart said:
Hiya

Just a thought , Have u fitted a good quality fuel filter not a cheap one

is the MAP sensor clean

what fault codes have u had plse

Hi I've cleaned the MAP and still the same, I will have a look at the code when I go to work.
Thanks for your reply

shaneannigans · Jan 16, 2020

gstuart said:
Hiya

Just a thought , Have u fitted a good quality fuel filter not a cheap one

is the MAP sensor clean

what fault codes have u had plse

So I paid more attention when fault come on,put my foot down and kick down comes in and seconds later ping fault comes up

Saint.V8 · Jan 16, 2020

Again, what is the fuel rail pressure readings in live data when you put your boot down.....if it remains low or doesn't rise with engine rpm, then either the injectors are leaking off excessively, the fuel pressure regulator is leaking back due to failed O ring, or the pre-supply pressure is too low.

shaneannigans · Jan 16, 2020

Saint.V8 said:
Again, what is the fuel rail pressure readings in live data when you put your boot down.....if it remains low or doesn't rise with engine rpm, then either the injectors are leaking off excessively, the fuel pressure regulator is leaking back due to failed O ring, or the pre-supply pressure is too low.

Hi I've not had time yet but I will have a look later
Thanks for your help

shaneannigans · Jan 16, 2020

Saint.V8 said:
Again, what is the fuel rail pressure readings in live data when you put your boot down.....if it remains low or doesn't rise with engine rpm, then either the injectors are leaking off excessively, the fuel pressure regulator is leaking back due to failed O ring, or the pre-supply pressure is too low.

Hi live icarsoft

Saint.V8 · Jan 16, 2020

Pre-Supply pressure at 4.19 bar is very good, 5 bar is excellent, less than 3 and you could have issues....so 4.19 is bang on.

Now, your rail pressure at 296bar - I take it this is at idle..... it is a little low for idle as I would expect over 325bar....350bar is better....

This is my M57 powered BMW 530d on INPA...you can see my rail pressure is 348 and it rises nicely when the engine is revved, and then it dips to 327ish and then back up to 348 ish....

What does the reading read when you rev it?

FYI: Here is one for a M57 525d and it shows the idle rail pressure close to 350-360....etc...

If your rail pressure is low, it could be the injectors leaking back excessively which will reduce rail pressure, or the fuel pressure regulator O ring leaking past.

shaneannigans · Jan 17, 2020

Saint.V8 said:
Pre-Supply pressure at 4.19 bar is very good, 5 bar is excellent, less than 3 and you could have issues....so 4.19 is bang on.

Now, your rail pressure at 296bar - I take it this is at idle..... it is a little low for idle as I would expect over 325bar....350bar is better....

This is my M57 powered BMW 530d on INPA...you can see my rail pressure is 348 and it rises nicely when the engine is revved, and then it dips to 327ish and then back up to 348 ish....

What does the reading read when you rev it?

FYI: Here is one for a M57 525d and it shows the idle rail pressure close to 350-360....etc...

If your rail pressure is low, it could be the injectors leaking back excessively which will reduce rail pressure, or the fuel pressure regulator O ring leaking past.

Thanks for your reply, yes it was at idle when I took reading.
So tomorrow I will do an leak off test,
Much appreciated for you help

shaneannigans · Jan 19, 2020

Leak off test run on tick over for 2 minutes

Saint.V8 · Jan 19, 2020

OK, what is the actual fuel measurement that has leaked off over that time? It should be below 20ml @ 2 minutes is what I was told when I had issues with my M57 530d.

Here is the link to my thread on a 5'er forum when I was asking about my issues! https://forum.bmw5.co.uk/topic/139223-2003-530d-se-touring-cranks-but-not-starting/

shaneannigans · Jan 19, 2020

Saint.V8 said:
OK, what is the actual fuel measurement that has leaked off over that time? It should be below 20ml @ 2 minutes is what I was told when I had issues with my M57 530d.

Here is the link to my thread on a 5'er forum when I was asking about my issues! https://forum.bmw5.co.uk/topic/139223-2003-530d-se-touring-cranks-but-not-starting/

Hi so 1 & 5 are about 35ml 2,3,4,& 6 about 20ml

shaneannigans · Jan 24, 2020

Saint.V8 said:
Pre-Supply pressure at 4.19 bar is very good, 5 bar is excellent, less than 3 and you could have issues....so 4.19 is bang on.

Now, your rail pressure at 296bar - I take it this is at idle..... it is a little low for idle as I would expect over 325bar....350bar is better....

This is my M57 powered BMW 530d on INPA...you can see my rail pressure is 348 and it rises nicely when the engine is revved, and then it dips to 327ish and then back up to 348 ish....

What does the reading read when you rev it?

FYI: Here is one for a M57 525d and it shows the idle rail pressure close to 350-360....etc...

If your rail pressure is low, it could be the injectors leaking back excessively which will reduce rail pressure, or the fuel pressure regulator O ring leaking past.

Good morning where is the fuel pressure regulator location, Is this the same as the fuel pressure sensor?
Thanks shane

Saint.V8 · Jan 24, 2020

shaneannigans said:
Good morning where is the fuel pressure regulator location, Is this the same as the fuel pressure sensor?
Thanks shane

It is located on the back of the high pressure fuel pump on the engine. You'll need to remove the intake manifold to access it.

range rover l322 2003 td6 fuel rail pressure plausibility

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