2008 TDV8 FFRR Engine management message

[james S]

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

[alanm_3]

TDV8s can be prone to split turbo hoses, so I would suggest that would be a good starting point.
After that, it could be any number of things, EGR valves, MAF sensors, turbos.

[camel_landy]

Yep, could be any number of things and by the sound of it your sensor was correct!

As it runs for a little bit, it sounds like the turbos are OK and I'm tempted to suggest the EGR side of things. However, don't discount a split in one of the hoses.

If it is turbo related... Brace yourself!!

M

[james S]

Thanks chaps - it runs fine for 99% of the time, though I'm increasingly thinking it might be a bit down on power. Hard to tell really.

Its going back it for a more thorough look over this week.

[mondeoman]

Could be a crank sensor, had something similar on a 3.0l BMW diesel

[camel_landy]

mondeoman said:

Could be a crank sensor, had something similar on a 3.0l BMW diesel

Could be a faulty brake light too but given the set of symptoms, it's more likely to be something in the induction system.

M

[james S]

Seems to have been a split hose - car feels much better now, so hopefully we've got it!

Thanks all