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2008 S80 T6 code P0171, PCV issue?

Help, Advice, Owners' Discussion and DIY Tutorials on the third generation Volvo V70 wagon and XC70 crossover, and second generation S80. Are you an owner? Prospective owner? Get in here and join us! Start a new topic or comment on an existing thread.

2008-2016 V70
2008-2016 XC70
2007-2016 S80

VCA
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VCA

2008 S80 T6 code P0171, PCV issue?

Post by VCA » Sun Jan 17, 2016 4:13 pm

Good day MVS!

I've got an '08 S80 T6 with its first 'I'm stumped' problem. I'm getting an ECM-P017100 (system too lean). It's too lean in bin 1,1 (idle basically), with the long term fuel trim going to 1.30 in that bin, but with all others being right around 1. No obvious vacuum leaks. However, I noticed vacuum at the dipstick that makes a sucking sound when pulling the dipstick. I see the Volvo test shows that crankcase vacuum should be between -0.2 and -0.5 kPa. I'm getting -2 in Hg of vacuum (-6.7kPa) at the dipstick. I also notice an oil 'scunge' in the vicinity of the oil separator's pipe that goes to the intake pipe that feeds the turbo. Does this mean what I think it means (failed oil separator)?

Any other things I need to look at on this car? I've checked all the obvious piping with no results.

Thank you!


2008 S80 T6 AWD
1999 S70 GLT

Responsible for the care of a '92 960 and an '07 S60R

VCA
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VCA

Re: 2008 S80 T6 code P0171, PCV issue?

Post by VCA » Mon Jan 18, 2016 6:48 pm

OK, so the oil trap was bad for sure. There was a vacuum leak at the little hole that the membrane uses for its pressure reference. New oil trap installed today and no more leak there, as well as significantly less crankcase vacuum...there's definitely a vacuum, but it's not 2 in Hg of vacuum, it barely tips my vacuum gauge into the vacuum range now (0.5 kPa vacuum is about 0.14 in Hg)...perfect. However, after resetting adaptives and test driving, the adaptives for area 1,1 are at 1.11 and I suspect climbing...so I still have an air leak somewhere. *&%$#@! Help?


2008 S80 T6 AWD
1999 S70 GLT

Responsible for the care of a '92 960 and an '07 S60R

VCA
Posts: 645
Joined: Thu Feb 21, 2008 7:28 pm
Year and Model: 2008 S80 T6 AWD
Location: Orlando, FL
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VCA

Re: 2008 S80 T6 code P0171, PCV issue?

Post by VCA » Tue Jan 19, 2016 8:21 pm

OK, so I just wasn't patient enough: the long term fuel trim went up to 1.14 after a long drive today and later came down to 1.12 after a drive. All's well.

Lesson learned: high vacuum at the dipstick might be just as obvious a sign of PCV failure as no vacuum at all...at least on P3 cars.


2008 S80 T6 AWD
1999 S70 GLT

Responsible for the care of a '92 960 and an '07 S60R

Jabber5
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Jabber5

Re: 2008 S80 T6 code P0171, PCV issue?

Post by Jabber5 » Wed May 09, 2018 8:57 am

I have the same year, same model, same engine, same code. How did you figure out that the leak was coming from the oil trap?



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ndphotonl
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ndphotonl

Re: 2008 S80 T6 code P0171, PCV issue?

Post by ndphotonl » Tue Sep 25, 2018 8:58 am

1.14% LTFT is awesome, good job.


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pierremcalpine
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pierremcalpine

Re: 2008 S80 T6 code P0171, PCV issue?

Post by pierremcalpine » Wed Sep 26, 2018 5:24 am

VCA wrote:
Tue Jan 19, 2016 8:21 pm
OK, so I just wasn't patient enough: the long term fuel trim went up to 1.14 after a long drive today and later came down to 1.12 after a drive. All's well.

Lesson learned: high vacuum at the dipstick might be just as obvious a sign of PCV failure as no vacuum at all...at least on P3 cars.
Thank you for sharing! Very helpful.



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