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S80 T6 lacks power

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
Loddzz
Posts: 17
Joined: Sun Apr 21, 2019 4:39 am
Year and Model: S80 T6, 2003
Location: Sweden

Re: S80 T6 lacks power

Post by Loddzz »

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
Posts: 17
Joined: Sun Apr 21, 2019 4:39 am
Year and Model: S80 T6, 2003
Location: Sweden

Re: S80 T6 lacks power

Post by Loddzz »

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
Image

Mass air flow
Intake air temp
Throttle Position
Image


And here´s a video of how the car acts on Kick-Down
https://www.youtube.com/watch?v=MZeuYOZEsXY
Loddzz
Posts: 17
Joined: Sun Apr 21, 2019 4:39 am
Year and Model: S80 T6, 2003
Location: Sweden

Re: S80 T6 lacks power

Post by Loddzz »

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
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SuperHerman
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Re: S80 T6 lacks power

Post by SuperHerman »

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.
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ndphotonl
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Year and Model: 2001 S80 2.4T
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Re: S80 T6 lacks power

Post by ndphotonl »

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.
Volvo S80 2.4T Wasa Limited Edition
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Loddzz
Posts: 17
Joined: Sun Apr 21, 2019 4:39 am
Year and Model: S80 T6, 2003
Location: Sweden

Re: S80 T6 lacks power

Post by Loddzz »

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

Image

Image
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ndphotonl
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Re: S80 T6 lacks power

Post by ndphotonl »

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)
Volvo S80 2.4T Wasa Limited Edition
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Cees Klumper
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Re: S80 T6 lacks power

Post by Cees Klumper »

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.
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ndphotonl
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Re: S80 T6 lacks power

Post by ndphotonl »

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

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

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

ImageVolvo S80 2.4T Pierburg TCV 7.22908.03.0 by ND-Photo.nl, on Flickr
Volvo S80 2.4T Wasa Limited Edition
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Kjmike95
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Joined: Tue May 21, 2019 1:38 pm
Year and Model: 2004 S80 T6
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Re: S80 T6 lacks power

Post by Kjmike95 »

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.
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