2004 4.4 v8 petrol ( no lpg conversion)

was running fine yesterday , suddenly cut out when setting off in traffic, maganged to get it started again but just spultters and backfires through air fileter if revved , also miss fires on tickover for a few seconds before completley cutting out again , it threw up cam position sensor bank 2 fault when first scanned , changed for a brand new genuine item from the stealers today , still the same , if left a good few hours , seems to tick over on cold start fine , can even rev it and it sound smooth but only for a few second then it just dies , if started again just misses on tickover then dies

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no codes , no warning lights what so ever
HELP with a capital H

THANKS IN ADVANCE
ian 2004 java black 4.4 v8 overfinch

Last edited by Haighy2 on 8th Mar 2018 4:03pm. Edited 2 times in total

Could well be the fuel pump playing up.

Have a search on here to see if your symptoms are the same... ______________________________
Simon
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Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current

there is preasure ar the fuel rail valve , i have taken a video but my phone has done it in hd so i cant upload it here , it reves up and sounds lovley if you raelly ease the pedal , if you try and rev normal or fast it bogs and backfires i have just checked the exhausts under car and before cats are too hot to touch , after cats are hot but touchable ,
ill try and upload to youtube and post the link 2004 java black 4.4 v8 overfinch

updated !!!!!

car now starts on the button but i can feel a slight missfire and engine now idles at around 950rpm , it wont rev without "bogging down" unless you move the accelerator really slowley , i have run my generic diagnostics software and the only coned shown were fuel trim too lean bank 1 and fuel trim too lean bank 2 ,,, im hoping someone has an idea as im loosing my will to live at the min with it stuck at home
thanks 2004 java black 4.4 v8 overfinch

I'd check the Mass Airflow Meter. Sounds like it doesn't know how much fuel to put in or is getting an incorrect reading.

I don't know about the RR, but on the Jaguar engines, if you pull the plug off the MAF it defaults to an onboard profile rather than adjusting for metered air. If doing this improves the running then it prettymuch confirms the MAF as your fault.

+ 1 for the MAF

ill whip off the maf when i get it to my unit in the next hour and take some before and after videos  2004 java black 4.4 v8 overfinch

Just unplug the MAF.
It'll still run without it plugged in. If it improves the pickup you've found the root cause.  2012 Westminster 4.4 TDV8 (sold)
2003 AB LE 4.4 V8 LPG (sold)

exactly the same with the maf unplugged  2004 java black 4.4 v8 overfinch