Hi all!

I have my new to me loveley alaska white 2012 4.4tdv8, but its not too happy at present.

It will drive all day sedately, even up to decent speeds, but if you out your foot down it immediately goes into restricted performance. Seems most likely to be something to do with the 2nd turbo due to the symptoms not being present under 2500 revs but happens every time beyond that.

The previous owner swears its never happened to him, but he drives quite slowly, seems like a nice guy and didn’t use it often between towing his caravan - so may be true… doesn’t matter now anyway.

Stored fault codes from powertrain module are below….
Permanent - p040d-00 exhaust gas temp sensor a circuit high
Intermittent - p004c-77 - turbo boost control solenoid b circuit low
Intermittent - p004b-71 - turbo boost control solenoid b circuit range/performance

Is this a common fault? A bit of research showed a sticky changeover valve could be at fault… where is it/what does it look like or anything else i need to check?

Welcome,

No idea of the codes, but there seems to be 2 culprits on these motors for that….

The 4 rubber hoses on the “donut” under the engine cover… split, perished or leaking….

The second turbo actuator that’s prone to sticking, down the front, sort of under the fan. Land Rover changed the design of it. Not sure when though.

Those would be my first ports of call.

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

https://www.fullfatrr.com/forum/topic37268...over+valve

https://www.fullfatrr.com/forum/topic44102...over+valve

https://www.fullfatrr.com/forum/topic51163...over+valve

https://www.fullfatrr.com/forum/topic52120...t=actuator

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

Welcome to the forum , and the 4.4 tdV8 gang
Lots of excellent threads full of help and advice to help you sort any issues.

I would put my money on the CSOV being stuck, particularly if it is the old design with the nut on top of the spigot.

It’s easy to see from the top if you remove the hose from the throttle body and look down the gap behind the radiator.

I will find you some photos if it would help.

Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Defo look at CSOV first. There is a modified version.
If you need a specialist then Henshall Engineering are your Cheshire go to  2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
New Defender D300 90 on order so "Rory" will be going to a new home....!
1974 Series 3 Lightweight = "Millie"
My preferred specialist: www.glenrands.co.uk
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Last edited by DrRob on 23rd May 2022 2:46pm. Edited 1 time in total

Great advice all - i’ll have a look today and let you know how i get on!

Its not the changeover valve, cant see a nut on top, just a stud so looks like the later design. I put oil on and hlgave it a wiggle anyway, but on test drive first time over 2500rpm it went into restricted again.

I’ll take the doughnut off and check the hoses next, although theres no obvious signs of a leak.

If anyone has any other ideas please let me know!

The donut (plenum) has been know to split at the seams so give this a good look whilst you have it removed.

I'm leaning towards it being one or more of the rubber hoses running into the donut. It's the most common fault on these 4.4 TDV8's. Had the same problem as you have encountered, FF was fine at normal speeds / lower revs, but would 'Fault' as soon as I gave it a bit of right foot on the loud pedal. I found a minor split on one of the right hand hoses going into the Plenum on my FF and that was what was causing my fault.
If you can, take the engine cover off and have a close look at the four hoses going into the Plenum (doughnut). The split / damage that is causing the fault may be really hard to spot, there may be a couple of tell-tale signs though such as sooting around one of the hoses caused by gases escaping. Maybe post a photo or two of the hoses and we can let you know if they are the original LR rubber ones or whether they've been replaced / upgraded with the better / later ones.

get a HIGH pressure smoke test done. It could be the inlet manifold.

Discotigger wrote:

I'm leaning towards it being one or more of the rubber hoses running into the donut. It's the most common fault on these 4.4 TDV8's. Had the same problem as you have encountered, FF was fine at normal speeds / lower revs, but would 'Fault' as soon as I gave it a bit of right foot on the loud pedal. I found a minor split on one of the right hand hoses going into the Plenum on my FF and that was what was causing my fault.
If you can, take the engine cover off and have a close look at the four hoses going into the Plenum (doughnut). The split / damage that is causing the fault may be really hard to spot, there may be a couple of tell-tale signs though such as sooting around one of the hoses caused by gases escaping. Maybe post a photo or two of the hoses and we can let you know if they are the original LR rubber ones or whether they've been replaced / upgraded with the better / later ones.

The 4 small ones on the donut itself…. Those ones?

Apologies i was trying to show a pic of mine.

They look like the original hoses that are prone to splitting.
Get some silicone ones on. Can't remember the dimensions but there is a thread on here about it.
Search "silicone" maybe? 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
New Defender D300 90 on order so "Rory" will be going to a new home....!
1974 Series 3 Lightweight = "Millie"
My preferred specialist: www.glenrands.co.uk
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Last edited by DrRob on 23rd May 2022 2:48pm. Edited 1 time in total

Those appear to be the old style ones which were prone to splits. The newer ones pictured with the white lettering are the split proof ones. You can make your own much more cheaply from silicone reinforced tube. 2012 TDV8 Vogue (L322)