Member Since: 07 Mar 2013
Location: Independent Republic of Kentishshire.
Posts: 4190
Like your thinking.. certainly worth a go!
Many thanks for posting!
30th Jul 2024 9:15 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4960
It has been known to happen and is not all that rare either. If you open the filler cap after a run or when the fault event occurs, and you can hear vacuum escaping that's a certain indicator the cap breather is blocked.yµ (idµ - eAµ) ψ=mψ
30th Jul 2024 9:41 pm
Farmer Chalk
Member Since: 07 Mar 2013
Location: Independent Republic of Kentishshire.
Posts: 4190
Well.. great idea and fitted the bill… driving for 20 minutes, engine warm, causing vacuum lock etc…great idea in principle but unfortunately not the reason.. bought brand new genuine fuel cap this morning, drove back from the dealer, put the engine under a slight bit of load and bang…same fault, engine fault, suspension fault , gearbox fault etc etc.. total loss of power..
Cycle ignition and clears itself but still leaves me with P0087 fault code fuel pressure too low…
Aaarrgghhh.
31st Jul 2024 10:35 pm
ballast
Member Since: 13 Apr 2007
Location: South Midlands
Posts: 185
Electrical? CAN bus?
2008 FFRR TDV8 - very similar set of faults to what you describe, including hard 'P' faults as well as many 'U' comms faults, engine fault, suspension, gearbox fault, you name it.
With my FFRR the problem got worse as it warmed up.
In the end concluded faulty ignition switch - I'm not suggesting this is the same, but the age of the vehicle means that the reported faults can be horribly misleading on a CAN that connects all the key modules, so it could be similar?
Replaced the ignition switch and bingo, everything solved
Just a thought and sorry if not helpful.
1st Aug 2024 8:25 am
defector
Member Since: 23 Feb 2009
Location: Greater Manchester
Posts: 1448
Is there a data logger that can be installed to the OBD.
Might show what's happening at the time it goes into limp mode.
1st Aug 2024 11:45 am
Farmer Chalk
Member Since: 07 Mar 2013
Location: Independent Republic of Kentishshire.
Posts: 4190
Going back into the garage vin Monday… unfortunately I don’t have the necessary skillset or knowledge I’m afraid…
2nd Aug 2024 10:56 pm
Brookie
Member Since: 17 Feb 2021
Location: Suffolk
Posts: 2
Sorry to read of your woes…
Any update on this as I’m having the same problems.
I’ve noticed that the oil temp sensor is faulty as I’m getting wildly fluctuating readings .
Not sure if a faulty oill temp sensor could trigger limp mode but it seems logical.
30th Aug 2024 8:20 pm
Farmer Chalk
Member Since: 07 Mar 2013
Location: Independent Republic of Kentishshire.
Posts: 4190
Apologies as there are a couple of other similar threads relating to this issue which I have updated but missed this one!
So went back to the garage and after a number of discussions with them we have fitted a new JLR fuel rail with incorporated fuel pressure sensor.. been back with me a couple of weeks now and all appears perfect…(presently) and maybe it’s too soon to say it’s cured but despite provoking it or trying to get it to default into limp home mode I have been unable to succeed.. which is great news so far..
The sensor has definitely made a difference as the car now behaves differently and when demanding power under load their seems to be a slight difference and almost a hesitation before changing down..
Fingers crossed and I will keep you all posted as lots of you are all reporting a very very similar fault…
30th Aug 2024 9:03 pm
Farmer Chalk
Member Since: 07 Mar 2013
Location: Independent Republic of Kentishshire.
Posts: 4190
Well a few weeks in and driving a number of miles on different errands I can report that the car has remained faultless.. so fitting a oem fuel rail and incorporated fuel rail sensor has still apparently made a big difference..
Will keep updating!
8th Sep 2024 10:55 pm
Brookie
Member Since: 17 Feb 2021
Location: Suffolk
Posts: 2
Good to hear - I also changed the pressure regulator and so far, no more limp
mode or low pressure fault codes.
As already mentioned, I noticed my oil temperature was all over the place and have a new temp sensor to fit but that doesn’t appear to be the root cause.
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