Drove into work this morning and put foot flat on floor and used kick down, car didn't want to go above 90 and when it got there, I heard a whistling noise (almost like a blow-off valve) from behind the glovebox and no more acceleration.

I had a quick search on here and couldn't find anything related. I don't have any warning lights on, but will see if I can plug in today.

Any thoughts or anyone had this issue before?

Thanks in advance Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG

Just used one of the guys fault readers at work and no faults in the car at all. Not to say that this is correct as it may not pick them up.

cheers Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG

I've just changed the aux water pump to the supercharger on mine as I found out from this forum that they can be wired backwards from the factory and that will cause restricted engine performance without out logging any fault codes.
Maybe worth changing as a matter of course,They were wired wrong from 05 to 07 years.

Not sure about the noise you described though.

I have already had mine replaced at LR nearly two years ago so would have hoped that as it has been replaced it would be wired correctly.

cheers Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG

@ Zarnd - don't count on it. I had to tell the "Tech" that he was trying to put the MAF on UPSIDE DOWN!!

Where is the autobahn in Kent then?  .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

I had mine changed as I had the Restricted Performance warning on the dash and it has been fine ever since. I had restricted performance again recently when I ran out of fuel and the EML came on as well, but that was my own fault and no codes stored for that either.

cheers Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG

Running out of fuel generally will cause a lack of performance

I spoke to local LR dealer and told her what the car was, gave the registration number and said it was supercharged.

When she called back she said if it was the BMW 4.4 then it would be a breather hose...

I explained again it was supercharged and that it was a 4.2 - she then said that it could be a manifold that has failed and needs replacing.

Waiting for a call back from the LR dealer I normally use to see if they can have the car at the end of July when I am away on holiday to have a look at it as I trust them.

cheers Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG

I have a video below. I can't go above 70mph now and get a constant hissing noise under WOT. A quick peek under the bonnet doesn't reveal anything.

Turn your speakers up and listen for the rushing sound of air under load.

https://vimeo.com/223418842

Any thoughts?

Cheers Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG

When you say above 70mph I assume that is in top so is it a rev limiting problem or a final drive problem ?

I would say rev limiting rather than driveline issue Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG

It sounds like a bearing noise. ______________________________
Vogue tdv8 08MY poverty pack - wow

It seems more like the sound of air in the intake. Will try and pop the engine cover off and hopefully find a failed hose.

Would have thought if it was a bearing that the noise would be there all of the time

cheers Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG

Took the engine cover off yesterday at work and checked all visible hoses and pipes, all seem ok. Next step today or tomorrow is to take out an exhaust sensor and check the cats to see if one has broken up.

Whistling/air noise occurred at 55mph today on the way to work and nothing above 80mph... Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG