S80 T6 lacks power

Loddzz · Post by **Loddzz** » 30 Apr 2019, 05:34

I Will do a new reading on the Fuel trim when i’ll get Home from work, and also try to unplug the BPS.

Yesterday i took the whole intake manifold off and put it back with new gasket, cleaned the throttle body, cleaned the TCV, changed more vacuum hoses under the intake manifold, and checked all other hoses and tubes(again).

But still, no change....
I can’t find any air leaks at all

Loddzz · Post by **Loddzz** » 30 Apr 2019, 10:48

Okay so, i did a new 5 min live logging, at idle and with warm engine.

Fuel Trim Short/Long term, B1/B2
Throttle Position

Mass air flow
Intake air temp
Throttle Position

And here´s a video of how the car acts on Kick-Down
https://www.youtube.com/watch?v=MZeuYOZEsXY

Loddzz · Post by **Loddzz** » 30 Apr 2019, 12:02

It seems like i’ve found what was wrong.
I disconnected the TCV and took it for a test drive. It lacked the power(of course), but it went smooth on Kick-Down.

So i guess the TCV is the bad Guy here

Post by **SuperHerman** » 30 Apr 2019, 14:24

From what I have read they do get "lazy" with age. I have heard some having luck spaying cleaner in there a few times. As it is failed/failing and you intend on buying a new one it cannot hurt. Easy enough to try, but for the price of a new one I would just replace it.

Your fuel trims still look too high. If you are certain you have no air leaks, I would try some injector cleaner in the gas a few times. Cheap enough and would address dirty fuel injectors if that is the cause. Basically you may be getting a dribble rather than a spray.

Post by **ndphotonl** » 01 May 2019, 12:17

Yep, your long term fuel trim should be between -10 / +10%. If you are buying a new TVC, then buy this one > viewtopic.php?p=503746#p503746

There is an easy test you can do with your TCV, blow through the top hole or rear hole (cant remember which one exactly), it should flow quite freely.

Loddzz · Post by **Loddzz** » 06 May 2019, 04:58

Well, my Volvo had an accident last friday...

Post by **ndphotonl** » 23 May 2019, 08:52

Regarding fuel trims, they should be between -10% / +10%. The short term fuel trim might fluctuate a bit more which is ok. The most important is that the long term fuel trims are between -10% / +10%.

If these values are excessive, then you have a problem (like vacuumleaks etc etc)

Cees Klumper · Post by **Cees Klumper** » 24 May 2019, 05:55

On my T6 I also had an issue similar to yours: hesitation at full-ish throttle. I replaced the TCV itself and the problem was solved. Definitely worth a shot IMO.

Post by **ndphotonl** » 24 May 2019, 07:20

Tip, save some money and buy the "HD TCV" which is a Pierburg unit which is used on Porsches & Rovers

Volvo S80 2.4T Pierburg TCV 7.22908.03.0 by ND-Photo.nl, on Flickr

Kjmike95 · Post by **Kjmike95** » 29 May 2019, 07:52

By any chance have you checked your boost? I'm having a similar issue and my boost readings are odd. My obd has a setting to read it.

S80 T6 lacks power

Re: S80 T6 lacks power