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PC76



Member Since: 01 Oct 2017
Location: Northwest
Posts: 334

United Kingdom 2010 Range Rover Sport 3.0 TDV6 HSE Baltic Blue
Restricted Performance (no fault codes)

Hi All,

I have just started to experience the restricted performance alert whilst driving normally under light to medium engine load. no fault codes are present that would indicate the cause of the issue.

Having read through what feels like several hundred posts with similar symptoms and multiple causes I'm hoping to gather a list of things to check for when I get chance to have a look under the bonnet.

in no particular order this is what I believe the causes could be. (due to no fault codes being identified)

i) Split air hose (is there a common fail point?)
ii) Split Crossover pipe (is this accessed from underneath?)
iii) Split intake manifold (is there a common point where they fail?)


Thanks in advance.

Post #610239 Fri Feb 19 2021 5:10pm
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Nilrem280



Member Since: 02 Jun 2020
Location: Portchester
Posts: 19

United Kingdom 2010 Range Rover Sport TDV8 HSE Nara Bronze

Can I ask what fault scan tool you're using?

Post #610250 Fri Feb 19 2021 8:12pm
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PC76



Member Since: 01 Oct 2017
Location: Northwest
Posts: 334

United Kingdom 2010 Range Rover Sport 3.0 TDV6 HSE Baltic Blue

I have a GAP IID

Post #610251 Fri Feb 19 2021 8:36pm
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RRSTDV8



Member Since: 12 Aug 2011
Location: Northamptonshire
Posts: 7410

United Kingdom 2012 Range Rover Sport SDV6 HSE Orkney Grey
Re: Restricted Performance (no fault codes)

PC76 wrote:

iii) Split intake manifold (is there a common point where they fail?)


The inlet manifold also forms the cam cover. The two parts are "welded" together and this weld is known to fail.

As for the cross over pipe, mine needed replacing recently (on an SDV6), and it didn't thrown up any error messages. Just FYI. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Post #610263 Fri Feb 19 2021 11:16pm
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Father Jack



Member Since: 16 Oct 2016
Location: Edinburgh
Posts: 457

Scotland 2012 Range Rover Sport SDV6 HSE Santorini Black

The twice I have had this pop up repeatedly it has turned out to be inlet manifolds. Maybe 3 or 4 other times dpf full but fixable with a long drive on 3 occasions and on the fourth a forced regen cycle by my local specialist.

Post #610281 Sat Feb 20 2021 11:28am
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PC76



Member Since: 01 Oct 2017
Location: Northwest
Posts: 334

United Kingdom 2010 Range Rover Sport 3.0 TDV6 HSE Baltic Blue

Just taken the engine cover off and it looks like I have a small oil leak on the top left air inlet (near side) around the middle cylinder (injector covered in oil).

Now I’m hoping that’s not the cause but know my luck probably will be.... does anyone know what live values I can monitor using the IID to prove what is causing this issue.

Thx

[edit] So I noticed that the small pipe that runs between the two intake manifolds was not seated correctly and pushed it into place, so will check again after some running around this afternoon to see if it has leaked anymore oil...

I also went on a 6 mile test drive and could not get it to go into limp mode no matter how I drove it. I also monitored the pressures in the intake manifolds, along with the boost pressures and mass flow data using my IID. whilst I'm no expert everything seemed equal or as per the expected value according to the the IID tool. so I'm hoping that I don't have an issue with the ink manifolds.... whilst I'm not holding my breath that such a small issue could cause the performance restriction it would act like a leak so fingers crossed..

in order to inspect the air pipes is this done from underneath with the covers removed or do I need endoscope to check from above?

Post #610285 Sat Feb 20 2021 11:44am
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Puslinch



Member Since: 08 Jan 2017
Location: Surrey
Posts: 151

United Kingdom 2012 Range Rover Sport 3.0 TDV6 HSE Firenze Red

Mine did the same on My12, no codes. It took 4 trips to LR to fix it under warranty. It was the rear crossover pipe, along with a fuel hose that was replaced. 2018 Telsa MS
2012 Range Rover Sport HSE+
1990 Porsche 944
1985 LR 90 Soft top V8

Post #610305 Sat Feb 20 2021 5:55pm
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Hog



Member Since: 03 Dec 2015
Location: The Netherlands
Posts: 252

Netherlands 2012 Range Rover Sport SDV6 HSE Lux Buckingham Blue
Re: Restricted Performance (no fault codes)

PC76 wrote:
Hi All,

I have just started to experience the restricted performance alert whilst driving normally under light to medium engine load. no fault codes are present that would indicate the cause of the issue.

Having read through what feels like several hundred posts with similar symptoms and multiple causes I'm hoping to gather a list of things to check for when I get chance to have a look under the bonnet.

in no particular order this is what I believe the causes could be. (due to no fault codes being identified)

i) Split air hose (is there a common fail point?)
ii) Split Crossover pipe (is this accessed from underneath?)
iii) Split intake manifold (is there a common point where they fail?)


Check TSB LTB00445v3/2012 for possible causes


Thanks in advance.
 RRS 3.0 SDV6 HSE Lux
RRS 3.0 TDV6 gone
LR 3 HSE V8 gone
DiscoveryII V8 Gone
Discovery 1 V8 Gone
Mustang Shelby
Alfa Guilia (classic)

Post #610410 Mon Feb 22 2021 4:03pm
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