2010 L322 3.6 V8 low power .

Hello
I’m reposting this cry for help as I put it in the wrong place earlier.
I’ve been the proud owner of my 2010 3.6 Range Rover for the past 5 years and in that time it has never broken down. Then, during lockdown the car went into limp mode and I found I had to replace the left side EGR. I did both to be on the safe side.
Sadly, once fixed the Mechanic’s computer found one of the turbos had failed .
Being a belt and braces kind of guy I had both turbos replaced, engine service and new battery..I picked the car up and enjoyed 250 miles of full power with old girl running better than ever until the car went into limp mode and repeated this every 250 miles or so and practically in the same place (about 3 miles from home)
Restarting the car cleared the limp mode and all is well again until 2 weeks ago when it wouldn’t clear.
Once again to the garage and the computer once again said “no” and demanded I replace an air flow sensor on the intake manifold (under the engine cowling).. That was an easy fix.....I did both just to be safe.
Sadly, the computer threw another tantrum and insisted I replace the air flow sensor attached to the air filter..I replaced both just to be safe. The mechanic said there was an underboost error so I changed both hoses from the intercooler. (Just to be safe) but I still have an engine that won’t run very well..
It’s a real shame as this has been an amazing vehicle but garages only read codes nowadays. Is there anyone out there who can help please. I’m not asking for free help and will gladly pay or donate to a charity of choice for help that fixes mymuch loved Range Rover. On advice from a member here I am seeking a local indie to look at it: Maybe even if you can’t help me fix this diy you know a Cambridge/Newmarket indie you’d trust to recommend?
Kind regards
Tim

Don't know anything about this engine but one thing after another showing up as a fault sounds odd. Wiring chafed somewhere or canbus rather than real?

This is the Ford engine, isn't it? Any ticking noises? The v6 version had plastic intake manifolds that used to warp but no idea if the v8 suffers the same fate.

I'd be tempted to go back over what has been done and check nothing trapped, all hose clips nice and tight, new filters etc and if you don't have a little Bluetooth diagnostic dongle and Ian Hawkins Torque app I would get that and have a play too.

Grrrrrr said:

Don't know anything about this engine but one thing after another showing up as a fault sounds odd. Wiring chafed somewhere or canbus rather than real?

This is the Ford engine, isn't it? Any ticking noises? The v6 version had plastic intake manifolds that used to warp but no idea if the v8 suffers the same fate.

I'd be tempted to go back over what has been done and check nothing trapped, all hose clips nice and tight, new filters etc and if you don't have a little Bluetooth diagnostic dongle and Ian Hawkins Torque app I would get that and have a play too.

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Hello Grrrrr
Thanks for your reply..I think you may be on to something with the inlet manifold or somewhere along the air intake suggestion but wouldn’t I expect to see some evidence of a leak of some sort? I’m not too mechanically minded and as a rule I just leave things to the experts but this has become quite a challenge.
V best
Tim

TurboTim said:

I’m not too mechanically minded and as a rule I just leave things to the experts but this has become quite a challenge.
V best

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Maybe it's time to learn a bit about the engine.

IMO, they're not expert's if they're chasing one fault after another.

I'd go back to the original issue and start again. Question, what turbo were used for the replacements? I don't think cheap aftermarket turbos will last long on this engine, as genuine turbos don't last long either.

Nodge68 said:

Maybe it's time to learn a bit about the engine.

IMO, they're not expert's if they're chasing one fault after another.

I'd go back to the original issue and start again. Question, what turbo were used for the replacements? I don't think cheap aftermarket turbos will last long on this engine, as genuine turbos don't last long either.

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Hello Nodge
That sounds like good advice all round but I may be a little long in the tooth to learn enough about this.
I don’t know the make of the Turbos but they are guaranteed for 2 years. Best Turbos in the Midlands did the work and have reviewed their work and satisfied it’s not Turbos. So is the local mechanic. The original turbo (left side) failed at 153,000 miles and I’ve never had a roadside breakdown. My reputation for keeping on top of maintenance is near legendary, to the point I have a waiting list of buyers for my cars when I’ve tired of them and the service history reads like “War and Peace”. I don’t think this problem is about component quality as I normally have LR originals. This car is a thing of beauty as far as I’m concerned so I just want her well again.
T

Check and clean the MAP sensors, this is a common cause..

it's also not unheard for one of the lower turbo hoses to fail from memory there are 6 in total 2 are short near the turbo and 2 longer ones to the intercooler and the 2 top ones that always fail. You can normally hear a boost leak.
they are a pain the the arse to fit..

The TDV8 can crack manifolds, thanks to the top quality materials used on the Lion V8 however a inlet manifold crack gives turbo boost pressure faults

another issue i've come across is poor connection between the MAP sensors and the plug on the loom.

As said it is best to only fit genuine Borg Warner turbos to the TDV8..

Do you remember what coded she was throwing?

Henry_b said:

Check and clean the MAP sensors, this is a common cause..

it's also not unheard for one of the lower turbo hoses to fail from memory there are 6 in total 2 are short near the turbo and 2 longer ones to the intercooler and the 2 top ones that always fail. You can normally hear a boost leak.
they are a pain the the arse to fit..

The TDV8 can crack manifolds, thanks to the top quality materials used on the Lion V8 however a inlet manifold crack gives turbo boost pressure faults

another issue i've come across is poor connection between the MAP sensors and the plug on the loom.

As said it is best to only fit genuine Borg Warner turbos to the TDV8..

Do you remember what coded she was throwing?

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Hello Henry
Thanks for your time and knowledge spared to help this lovely Land Rover.
All the sensors are new as far as I know but it certainly is behaving like (but worse) when a top hose failed..
That seems to point to a lower hose leak as you suggest. All this is beyond my skill set but good direction when I find someone who has a similar passion for this car as I have.
V best
T

intercooler sludged up?

RangeRoller dt said:

intercooler sludged up?

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Interesting! Does it need to be removed to clean?
T

Yes
Internal galleries can block up with oil, you have had turbo go and pressure there back was my thought.
diy cost fiver if you know how to take it out/reinstall

RangeRoller dt said:

Yes
Internal fins can block up with oil, you have had turbo go and pressure there back was my thought.
diy cost fiver if you know how to take it out/reinstall

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Fins are on the outside of the airways.

Does the tdv8 have dpf?
I had a vauxhal astra van that exhibited similar symptoms and it turned out that the pipes for the differential pressure across the dpf were slightly split and thus it was going into limp mode.
Strangely, it also was giving egr errors rather than differential pressure errors until eventually the dpf became clogged. It then went into hard fault and wouldn't reset.
I replaced the sensor pipes and did a regen but still said it was blocked.
Washed it out with caustic soda and you wouldn't believe how much crap came out. Once clean it was fine.
If it has dpf, get em off and soaked in caustic overnight then a good wash out with hot water and leave to dry for a few hours.

myfirstl322 said:

Fins are on the outside of the airways.

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Apologies, galleries