Big Loss of Power 2.0hdi

[richard77]

Loss of power today meant it was too dangerous to drive so got relayed home.
It really became obvious when it wouldnt stay in 4th going uphill, and when it seemed like it was in 4th gear instead of 1st when pulling away. It got much worse in the last mile or two
I noticed this morning it seemed slightly slow, like  there was a lot of weight in it,but it would still rev and drive OK
The coolant temp was getting higher than its ever been, although it was only 85max,
There was plenty of coolant, and oil, the air filter looks ok, no bubbles in the fuel line nor in the coolant reservoir
Could it be a clutch problem?
Otherwise Ive no idea what's wrong, no fault codes show on the obd2 scanner.
I think Ive killed it

[cancunia]

It may be Limp Mode caused by a faulty MAF. Is there a limit to how high it will rev?

[oilyrag]

If it was a clutch problem the engine revs would rise without any increase in road speed - so in 4th going uphill the clutch would slip and you'd smell the linings cooking.
Are the brakes free - can you roll the car by pushing?

[ffrenchie]

It may be Limp Mode caused by a faulty MAF. Is there a limit to how high it will rev?

I'd disconnect the MAF sensor, first thing to try. What do you mean when you say it wouldn't stay in 4th did it jump out or did you just have to change down ?

[richard77]

Its not in limp mode.
A hill it normally climbs in 5th at 50mph,Id have to use 4th or even 3rd.
Its like driving with the foot of God on the brakes

[cancunia]

Its not in limp mode.
A hill it  normally climbs in 5th at 50mph,Id have to use 4th or even 3rd.
Its like driving with  the foot of God on the brakes

Would be good to know how it revs in neutral & if it will go over 2.5-3k rpm. Maybe a loss of turbo boost, do you have the Torque app connected to your OBD reader? 
 In any case, disconnecting the MAF as suggested above may lead to some ideas. Beyond that you'll probably need Lexia / Diagbox.

[richard77]

In neutral it revs very slowly up to 2/3000rpm, gets gradually quicker as revs rise to 4000+rpm
Im going to check turbo boost on Torque app

[richard77]

So there is no Turbo Boost Pressure.
It drives very slowly, it did go to 4000rpm/50mph, in a very embarassing way

[richard77]

It turned out that the pipe came off the air intake, after the MAF sensor

[Zion]

That will do it!