Diagnose Lack of power / high consumption

[Maestrours]

Hi folks,

Here I come with a long term problem on my 00' V70 XC (2.4t 193hp). Please excuse my english as I am french

Following a complete timing belt setting, which solved a lot of problems (rough idle very, VERY high consumption), and an ETM refection wich solved another lot of problems (10 mph max....), this car is now able to ride some distances.

But, as I previously had some of these engines, i can tell that it doesn't have his 193hp (I would tell like 140..), and the consumption still is enormous (around 14mpg on average daily drive, 19 on same drive with my 209hp 2.5t S60).

The fact is, it starts ans cranks very fine, idle is perfect, cold start too. Driving is almost fine, except when I want to really accelerate. Then it acts like a atmospheric engine, and the consumption just get crazy.

So i can get easily get 100mph, but it takes a lot more time than expected.

The main issue is the consumption for me.

- coils ok, brand new spark plugs
- not a single dtc code is traced back by VIDA
- depression hoses changed by new ones around the turbo.
- PCV is OK
- timing belt ok, camshaft angle ok
- VVT valve ok

how can I control my boost circuit, what can you recommend me to test ?..

I guess suspects are turbo, TCV, but I never had to test things like this before so I don't know where to start, what to check first, what boost psi I am supposed to have...

All help will be much appreciated.

Thanks by advance!

[June]

1 low octane fuel
2 worn fuel injectors
3 bad MAF
4 faulty TCV or vacuum line going to it.

I've had high consumption/low power issues from all four I listed above on my 2004 S80 T6. From owning a 1998 V70 Cross Country AWD in the past. My experience was the car got worse fuel economy and the car was less peppy than the same engine in a FWD service loaner of the time. It seems not advisable to change your turbo settings without verification a low boost pressure issue exists. June

[Maestrours]

Hello! Thanks!!! I beginned with TCV with a scheme I found (thus with yellow, blue and red hoses).

I Guess I had a winner: previous owner, not satisfied by a catastrophic timing belt and vvt setting, did invert vacuum and pressure hoses on the TCV valve. 2 minutes later my car has recover at least a good 40 hp!

Thanks, that's all for me for this problem

[scot850]

Great news and well done figuring that out!

Neil.

[misha]

When you know that ignition components,engine and a turbo on turbo engine are in good shape...real lack of power is almost always a bad vacuum lines from turbo.

Always check simple things first!

[Maestrours]

I had no idea about turbo shape.. Glad it was not this!

Does anyone know the pressure needed to move the wastegate?
I feel that the power is here, but a bit late, and would like to control the wastegate setting.. can't find the good psi...
Thanks !