I wonder if this is a known problem with this engine and if anyone can help me avoid a wild goose chase

A few weeks ago I was driving on the motorway and an engine management system light came. The car switched into limp home mode at around 50pmh. The message only lasted a few seconds, I then pulled over and restarted the engine to find everything was OK. It then happened a few times a week later, but this time I was restricted to about 30 mph. When it happens I get a message on the media screen which says the terrain response system isn’t working, but its hard to know whether this is the cause or a response to it.

I took it to my local garage for diagnostics and it seems the turbo boost pressure sensor (or similar) had thrown a signal and it was suggested we put a new sensor in. We did this on Thursday, but yesterday I got the same message and symptoms again. Again the the engine management message goes after about 5-10 seconds and if I turn the car off and start it again its perfectly fine.

Its hard to be sure, but I feel the car lacks a bit of power and I am struggling to get more than about 22mpg on average, compared with 24 some months ago. It is sometimes taking a few seconds to start, which has never happened before.

Any thoughts on known issues? thanks James

First off, go to a decent LR independant,secondly TDV8 boost faults are usually related to stuck or failed actuators on the turbo's themselves. Good luck,its not cheap...

Thanks - its in for diagnostics now

Not worked on tdv8 but have on tdv6. If it is same will have an egr on each bank. Worth having a look if they are blocked

Get it diagnosed properly, as above, actuators are a good starting point, can be seized in place, best off getting an actuator kit, if i remember correctly, you can only replace one side, the other is a whole new turbo from a dealer, just remember while they are only allowed to supply genuine bits, you can get the other via 3rd parties !

As eightinavee said boost problems normally relate to EGR faults or turbo actuators. Turbo actuators can be freed off with a bit of spray oil and a stiff bit of wire to push and pull the actuator, not easy to get at the turbos though.

Can sometimes be a split hose from intercooler to manifold. Worth checking as it doesn't cost

Andy_J said:

As eightinavee said boost problems normally relate to EGR faults or turbo actuators. Turbo actuators can be freed off with a bit of spray oil and a stiff bit of wire to push and pull the actuator, not easy to get at the turbos though.

Can sometimes be a split hose from intercooler to manifold. Worth checking as it doesn't cost

Click to expand...

Think that was me with the EGR

oops

And the winner is Andy J with 'split hose from intercooler to manifold' Thank God!!

Feels like a new car - thanks for your help all