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2002-2005 Range Rover MkIII / L322
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Can you get your lpg sorted as that will tell you if it’s the fuels system or something else? Save you messing further
 

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2006-2009 Range Rover Sport
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165 Posts
Discussion Starter #182
Can you get your lpg sorted as that will tell you if it’s the fuels system or something else? Save you messing further
nah cause I think to calibrate the lpg the petrol has to be running in good stead :( I've got one quote for about 700ish quid to do it by a LR specialist. Ama get a few quotes and just bite the bullet. I think it is fuel pump cause when its a low tank and I floor it its noticeable.

My idle psi at rail when idling is 35psi. That seems low. Also makes sense why when I slow accelerate its fine at high rpms but when I demand lot of the fuel rpm quickly it has trouble.
 

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2006-2009 Range Rover MkIII / L322
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610 Posts
35psi is almost 2.5 bar it is in limits. 4.2 has returnless fuel system. Fuel pressure sensor is the regulator. If you feel lag or hesitation maybe its time to look in to the fuel tank. Not the main fuelfilter. In tank filters and pipes. You can wash them with carb cleaner and the pipes with chamical injector cleaners like wynss
I’ll do this asap on my 4.2
I gonna clean injectors on a bench and mechanically clean the fuel tank with all bowels
 

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2006-2009 Range Rover Sport
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165 Posts
Discussion Starter #184 (Edited)
I unfortunately don't have a ramp to remove the tank so its going to have to be a mechanics job

also according to this isnt it mean to be almost 50psi?

Land Rover Workshop Manuals > Range Rover (LM) V8-4.2L SC (2006) > Powertrain Management > Fuel Delivery and Air Induction > Fuel Pressure > System Information > Specifications > Fuel Pump Volume > Page 3508

the only reading I have is from obd tool

last time freeze frame was 36psi, at 30mph and 1100rpm

another one 49.6psi, at 18mph, at 2200rpm
another one 39psi at 8mph at 1600rpm
another one at 42psi, at 26mph, at 1300rpm
another one at 46psi at 60mph, at 2100rpm

so not sure if its gained enough for such a high speed?

also ive never seen it over 50psi.

also obd throws this image

 

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2006-2009 Range Rover MkIII / L322
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610 Posts
Try to kickdown and look at the obd reader measurements from 4th gear to 3th while you are hearing charger whines fuel pressure have to raise 70psi if you had fuel pressure sensor issue its has a code and black smoke like tdv6 range rover.
I replaced that sensor 3-4 years ago its a ford part
I suggest you to check resistance on fuel pressure sensor. Has to be 38-43
I didnt see yet on this engine decreasing fuel pressure according to injectors. Maybe my range is doing this
Check the readings.
Fuel pressure sensor is very accessible
 

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2006-2009 Range Rover MkIII / L322
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610 Posts
I think both banks are affected
You have just p0171 or p0174 too?
Maf is new?
I couldn’t remember did you smoke tested for leaks?
 

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2006-2009 Range Rover Sport
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165 Posts
Discussion Starter #189
I think both banks are affected
You have just p0171 or p0174 too?
Maf is new?
I couldn’t remember did you smoke tested for leaks?
both banks, both p0171 and p0174. maf is indeed new, and no leaks. also when low tank of fuel it struggles with kick down
 

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2006-2009 Range Rover MkIII / L322
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610 Posts
Another smoke test done to confirm but no luck. Something is definitely wrong though since I get 9mpg around town
Lucky you
I get 6mpg
Injectors are working 3 shifts and overtime and i am paying
Is your reader drawing graphs for 02 sensors?

Did you check resistance on fuel pressure sensor?
Maybe time for substitute
 

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2006-2009 Range Rover Sport
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165 Posts
Discussion Starter #194
Lucky you
I get 6mpg
Injectors are working 3 shifts and overtime and i am paying
Is your reader drawing graphs for 02 sensors?

Did you check resistance on fuel pressure sensor?
Maybe time for substitute
haha, other people in the uk are getting 16mpg.

do you know where the sensor is? i cant seem to find it on any diagram in teh workshop manual
 

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2006-2009 Range Rover MkIII / L322
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610 Posts
Very accessible. If you use once screwdriver in your life 10 min of work if not 20 min.
For your situation driver side behind the fuel rail cross the abs block right after oil filler.
283743

Something like that

On scheme


This part and part number is


I think you have ford labeled part.
Same **** with different color.
FORD number is like this
AA 8F16G 689
Resistance is like this on out limit sensor

283744

1,34 кОм
38,9 кОм
38,9 кОм

This is the from the new one

The equipment for testing and replacing this sensor is like this
 
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