Hi all, I've been noticing a very odd sound from my 4.4tdv8 when lifting off the accelerator on pulling away that sounds like a turbo dump valve/twittering owl hoot/wood pigeon noise. It's very faint tbh... bit of an odd description but a difficult sound to describe.

I've also just had a 'restricted performance' message when pulling our caravan up a steep hill and it kicked down also but this has cleared on stopping and restarting and didn't come back after over 100 miles of the remaining trip.

Would I be right in thinking it may be a boost leak and any suggestions as the first port of call to look?

Mine did this very occasionally when dragging tin tent , found by stopping and leaving it and waggling main boost pipe going into throttle body it was fine on a restart , did the throttle body 3 o ring mod whilst trying to sort out dpf regen issues last year (final bit was changing egt sensor to get rid of po40d code earlier this year) and so far no issues , time will tell over the next 6 months , never did yellow restricted performance issue without tin tent on back though.

Well folks I also have this issue in that mine has gone into limp mode twice recently after climbing steep hills locally. Having parked up and restarted the engine it had reverted to a normal drive and is caused I think once the 2500 rpm barrier is crossed. I have cleaned the MAF sensors and the MAP sensor since in case they were the cause and will have a smoke test done next Tuesday. I have also obtained the 3 throttle body O rings as mentioned by Matthews in case that proves to be the fix.

Having too wave at traffic behind to overtake you is neither fun nor good for the RR image? Hopefully Tuesday will confirm a cheap fix!

Mine did the same when I first bought her, turned out the CSOV was full at fault, sticking shaft. Indy took it apart, cleaned everything up & not a peep since, that was four years ago. Donut hoses are also on the ‘culprit’ list. 2012 Orkney Grey Westminster 4.4TDV8 with Ivory interior.........nice!
Alfa Romeo Giulietta
Just one Montesa now, 349 White Wonder
Austin A40 Farina MK2
1975 Morris Marina 1.8TC
1973 Honda CB250 K4

Hi Fox889
Wonder if you could explain what CSOV abbreviation means please. Mine in for smoke test but be nice to include it in conversation with the mechanic tomorrow.

Thanks

It's the valve that operates the 2nd turbo after 2500rpm located botton right nr the radiator. Loads of info on here regarding un seizing the earlier types if you do a search. 2012 TDV8 Vogue (L322)

Give this rubber elbow a good check, several have started to perish and cause leaks.

Click image to enlarge

Thanks for the comments!
Read the codes and it had the following...

P00BF - Mass or volume air flow B circuit range performance - Air flow too high
P0235 - Turbocharger boost sensor A circuit
P040D - Exhaust gas recirculation temperature sensor A - Circuit high
P004D - Turbo boost control solenoid B - Circuit High
P004B - Turbo boost control solenoid B - Circuit range/performance

Not had chance to look into these yet but cleared the fault codes and they've not come back so far. Given it a good work out right up the rev range and no 'restricted performance' message so it seems to be intermittent and possibly when under load.

Still making the twittering/blow noise though.

Twittering/blowing/churuping noises are almost always induction system leaks. Check for soot on the main induction intake to the doughnut where the black elbow joins the throttle body. Item 6 in the photo below. Also check the four rubber hoses on the doughnut.

As a matter of good hygiene do a good clean of the MAPT ( orange pentagon in the photo) and MAF sensors, plenty of info on here if you search and look through the wiki.

The MAPT sensor on mine I have to clean twice a year, it’s amazing how much crud gets on the sensor itself & don’t forget to look down the little hole it sits in, mine was covered completely. Cotton wool bud cleared that out & a spray of brake cleaner done the sensor. 5 min job tops. 2012 Orkney Grey Westminster 4.4TDV8 with Ivory interior.........nice!
Alfa Romeo Giulietta
Just one Montesa now, 349 White Wonder
Austin A40 Farina MK2
1975 Morris Marina 1.8TC
1973 Honda CB250 K4

JayGee wrote:

It's the valve that operates the 2nd turbo after 2500rpm located botton right nr the radiator. Loads of info on here regarding un seizing the earlier types if you do a search.