Join Today
Results 1 to 7 of 7
  1. #1
    Junior Member
    This user has no status
    Turbo_Boss's Avatar
    Join Date
    Jun 2015
    Location
    Panama Rep. of Panama - Central America
    Posts
    9
    Thanks
    2
    Thanked 3 Times in 2 Posts

    2008 XC90 3.2L with codes P0171 and P0174 - Help

    Hey guys,

    I have a 2008 XC90 3.2 AWD with 75,000 KMS that I got recently.

    Checking with OBD FUSION, I got the codes:

    P0171 and P0174 System Too Lean

    P0507 Idle Air Control RPM Higher than expected.

    The car feels and drives normal but I want to fix these before it gets worse.

    Searching on the web for these codes P0171 and P0174 its look like maybe the problem is the PCV but I don’t find any info, pics or DIY fix for this issue on a 3.2L engine

    Have any of you with 3.2L engine has experienced these same codes?

    I going to check if I have a vacuum hose leak but can you advise were I need specially to look

    Thank you for your time and help

    Isaac

    2007 XC90 - 6 Cyl 3.2L AWD

  2. #2
    Senior Member
    Appreciative
    kmb's Avatar
    Join Date
    Oct 2014
    Location
    Suffolk & Rhone Alpes
    Posts
    1,396
    Thanks
    926
    Thanked 455 Times in 375 Posts
    I had P0172 system too rich but this was on an 850 - it was the vacuum hose elbow to the left of the inlet manifold (not sure if similar exists on your car), all rubber elbows definitely worth a check!

    Looked like this:



    Is your lambda light on?
    Last edited by kmb; Tuesday 21st July 2015 at 08:17.

  3. The Following 2 Users Say Thank You to kmb For This Useful Post:

    jamesy12345 (Monday 17th August 2015),Turbo_Boss (Wednesday 22nd July 2015)

  4. #3
    Shiny Superstar
    Back in the game!
    Wobbly Dave's Avatar
    Join Date
    Aug 2004
    Location
    Stunning Shropshire
    Posts
    17,773
    Thanks
    2,501
    Thanked 3,484 Times in 2,466 Posts
    Sounds like an air leak to me. Check all your vacuum & breather hoses. If you can get yourself to a garage with a smoke generator and pump smoke to find the leak.
    Volvo ABS ECU Repair
    Join my projecteers tribe - Old Volvos Never Die - They just get faster.

    Visit my VPCUK garage and my YouTube channel - WobblyDave72

  5. The Following 2 Users Say Thank You to Wobbly Dave For This Useful Post:

    jamesy12345 (Monday 17th August 2015),Turbo_Boss (Wednesday 22nd July 2015)

  6. #4
    Junior Member
    This user has no status
    Turbo_Boss's Avatar
    Join Date
    Jun 2015
    Location
    Panama Rep. of Panama - Central America
    Posts
    9
    Thanks
    2
    Thanked 3 Times in 2 Posts
    Hey Guys.

    After several web search, I found that these two codes are related to the PCV OIL TRAP – VALVE COVER. Since the membrane/diaphragm is damage, it alow air to enter in the system that the MAF is not metering and that why it trow System Too Lean codes.

    This is causing a small misfire and I am pretty sure is consuming more fuel.

    So today I was checking the black housing on top of cylinder head and the first thing I notice is that is all covered in oil.

    Also notice a hissing noise that is coming from the engine oil cap. I removed the oil cap and put my hand over the hole and there is a "noticeable" suction.

    I am thinking in ordering:

    PCV OIL TRAP – VALVE COVER Part No. 31319642
    VALVE COVER GASKET Part No. 30731243

    Can you guys, let me know what’s the correct torque setting for the torx screws for the PCV OIL TRAP VALVE COVER?

    Thx for your time and help

    Isaac

    2007 XC90 - 6 Cyl 3.2L AWD

  7. #5
    Junior Member
    This user has no status
    Turbo_Boss's Avatar
    Join Date
    Jun 2015
    Location
    Panama Rep. of Panama - Central America
    Posts
    9
    Thanks
    2
    Thanked 3 Times in 2 Posts
    Hey Guys,

    So today I have more time to check the valve cover Oil Trap and in the name of the science, research and investigation :-) I decide to remove the plastic cap on top of the diaphragm housing.

    I know other brands like VW and BMW sell the membrane/diaphragm alone so I was expecting to see if I can replace it and save some $$$

    I went to a place where they sell OEM and aftermarket parts for BMW. They were very similar but none of them fit or was the same.

    On the Volvo membrane/diaphragm there is a part No. CF W 3A MB66-24
    Doing a search on the net I don’t find anything under that part No. or something similar.

    Anybody knows where can I get this part? If not, I will have to buy the complete valve cover oil trap :-(

    THX,

    Isaac







    2007 XC90 - 6 Cyl 3.2L AWD

  8. #6
    Junior Member
    This user has no status
    Turbo_Boss's Avatar
    Join Date
    Jun 2015
    Location
    Panama Rep. of Panama - Central America
    Posts
    9
    Thanks
    2
    Thanked 3 Times in 2 Posts
    Hey Guys.

    So yesterday, I change the PCV OIL TRAP – VALVE COVER Part No. 31319642 on my 3.2L and cleared/reset the P0171 and P0174 System Too Lean codes and now the engine is smooth and not misfires.

    So today I was driving and my check engine light come on and these are the codes I get:
    P0172 and P0175 System too Rich.

    Any advice what to check? Or what other test to make with the OBD Scanner?

    THX,

    Isaac

    Here is the screen shot of the OBD Codes and also the Term Fuel % on idle on Bank 1 & 2



    2007 XC90 - 6 Cyl 3.2L AWD

  9. #7
    Randomly Typed Username
    Iraq Lobster
    jamesy12345's Avatar
    Join Date
    May 2013
    Location
    lives on Standard Row
    Posts
    7,389
    Thanks
    4,606
    Thanked 3,343 Times in 2,497 Posts
    Hello over there

    I've not familiar with this engine but a bit of searching on the net showed these codes might be caused by oxygen sensor, MAF or vacuum leak

    Can you get access to a better diagnostic system? It would be expensive to replace the above mentioned components without knowing 100% they are defective.

    Vacuum leak can be found by smoke testing.

    http://www.justanswer.com/volvo/7x27...ow-sensor.html

    //edit

    just noticed two guys above have already suggested air leaks
    Last edited by jamesy12345; Monday 17th August 2015 at 07:59.


 

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
This website uses cookies
We use cookies to store session information to facilitate remembering your login information, to allow you to save website preferences, to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.
     
ipv6 ready