range rover l322 2003 td6 fuel rail pressure plausibility

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Looks like this....

image.png.82caf86a3661e25b43b1dc65d1de0299.png
 
Being a plumber i have about six assortment boxes in the van, they have got me and others out of the sticky stuff many times on all manor of machinery from cars to steam engines:D
 
shaneannigans said:
Hi so changed o rings and seals but still same fault coming up
Live reading is now surging between 29696 & 32768
Click to expand...
That looks a little better pressure readings...getting into the 300's now which is OK(ish).

The Leak off was within spec at around 20ml over 2 minutes or whatever it should be....

Refresh the brain, have you tried a squirt of easy start into the manifold?

I took the intake pipe off the front of the manifold, gave it a squirt in the manifold and a squirt down the pipe, reconnected the pipe and fired her up....

Have you tried this?
 
Saint.V8 said:
That looks a little better pressure readings...getting into the 300's now which is OK(ish).

The Leak off was within spec at around 20ml over 2 minutes or whatever it should be....

Refresh the brain, have you tried a squirt of easy start into the manifold?

I took the intake pipe off the front of the manifold, gave it a squirt in the manifold and a squirt down the pipe, reconnected the pipe and fired her up....

Have you tried this?
Click to expand...
Thanks for your reply, I haven't done that yet but will tomorrow, what will this do?
 
Not so sure that live reading is kpa to be truthful.
32768 is a maxed out integer so my feeling is that the icarsoft isn't scaling it to kpa and the surging between 29696 & 32768 is just an over-range on the parameter.
Not sure what the output voltage range would be on the sensor but I'd be sticking a multimeter on it.
Any sensor giving a reading of 32768 or 16384 would have alarm bells ringing for me.
 
Wazzajnr said:
Not so sure that live reading is kpa to be truthful.
32768 is a maxed out integer so my feeling is that the icarsoft isn't scaling it to kpa and the surging between 29696 & 32768 is just an over-range on the parameter.
Not sure what the output voltage range would be on the sensor but I'd be sticking a multimeter on it.
Any sensor giving a reading of 32768 or 16384 would have alarm bells ringing for me.
Click to expand...
If you look back as his other screenshots, it lists them in kPa....which means his 29696 is 296.96bar and 32768 is 327.68bar....which is roughly (albeit a little low) where the fuel pressure shoudl be at idle.

shaneannigans said:
Thanks for your reply, I haven't done that yet but will tomorrow, what will this do?
Click to expand...
Forget the easy start - I thought for a moment yours wouldn't start....only to remember it does, it just faulters when pushed hard when running.

So, what does the live data reading state when you rev it up? If you recall from the video I linked earlier, when the engine was revved up, the fuel rail pressure increased with engine speed...does yours do similar?
 
Saint.V8 said:
If you look back as his other screenshots, it lists them in kPa....which means his 29696 is 296.96bar and 32768 is 327.68bar....which is roughly (albeit a little low) where the fuel pressure shoudl be at idle.


Forget the easy start - I thought for a moment yours wouldn't start....only to remember it does, it just faulters when pushed hard when running.

So, what does the live data reading state when you rev it up? If you recall from the video I linked earlier, when the engine was revved up, the fuel rail pressure increased with engine speed...does yours do similar?
Click to expand...

I'm not convinced
32768 is just too conveniently the maximum value for a 16 bit parameter with sign. (i.e. +/-32768 for a total of 65536)
That would mean that the maximum pressure it could possibly read is 327.68kpa which you say is a bit low.
I'm not doubting your knowledge for a minute, just pointing out that that doesn't look like a realistic number to me (especially as the low pressure rail is conveniently scaled to a real number rather than an integer)
Might be wrong, but I'd still be checking the "actual" analogue voltage or current with a meter.
 
Saint.V8 said:
If you look back as his other screenshots, it lists them in kPa....which means his 29696 is 296.96bar and 32768 is 327.68bar....which is roughly (albeit a little low) where the fuel pressure shoudl be at idle.


Forget the easy start - I thought for a moment yours wouldn't start....only to remember it does, it just faulters when pushed hard when running.

So, what does the live data reading state when you rev it up? If you recall from the video I linked earlier, when the engine was revved up, the fuel rail pressure increased with engine speed...does yours do similar?
Click to expand...
Hi i will have a look today. Just a thought could this be down to injector copper seals?
 
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