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    Thread: Another System Too Lean At Idle Thread

    1. Senior Member christofambrosch's Avatar
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      08-17-2012 04:40 PM #1
      - 2008 GLI
      - 2.0T FSI
      - Forge WINTake
      - BSH PCV fix
      - Unitronic stage 2
      - MIL is on:
      - P2187: System too lean at idle

      At first I thought this could be spark related. Changed the plugs (OEM NGK copper to NGK Iridium IX) and the issue appeared to be solved. However, I now know that this is happening once the car has been driven about 30-40 minutes. Symptoms are:

      - Boost peaks at 5 psi
      - Slow acceleration
      - Loss in fuel consumption

      The first thing I checked was the newly installed Forge WINTake system. I wanted to make sure it was all proper and nothing had expanded or slipped after installation. All clamps are tight and all silicone are properly seated. Also, the mass airflow sensor is properly seated.

      The second thing I checked was the mass airflow sensor. I had swapped that with a known good sensor and had the same issue. I was then going to run some VCDS logs to see if the fuel was within spec from the HPFP. Before being able to do this, I did a lot of searching and kept finding the same answer; PCV system.

      The one thread I read had the same issue but was running the BSH catch can setup. I am running the BSH PCV fix (block off). There was a small leak with his plate allowing air to enter. He also had a lot of blowby in his lines and plate even with a catch can. This afternoon, I pulled off my block off to inspect the gasket and ports. No blowby at all and no uneven compression of the gasket. Also, the case ventilation hose was replaced in June. I reinstalled everything and had to go to work. No dice.

      So I am back to the drawing board. I have some options:

      - Pull off rear PCV tube and remove check valve if present
      - Log fuel trim via VCDS

      My confusion comes with the fact that most of these parts have been installed on the car for a while and only now displaying an issue. The BSH PCV fix was installed in February and the HPFP sensor recall was performed in April.

      My anxiety comes with the fact that I only have 3,000 miles of warranty left and if it is a covered part, I would like to have it taken care of.

      Any input would be greatly appreciated.
      "Antequam desilirent", RIP brothers.

      Christof Ambrosch Photography

    2. Member Tutti57's Avatar
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      08-17-2012 07:24 PM #2
      I would do a pressure or smoke test to see if there is a vacuum/boost leak and where it's coming from.
      2006 Passat 2.0T Tiptronic | Unitronic Stage 2 | DG Springs | Newsouth Boost Gauge | BFI Tranny Insert | Rev D DV | BSH PCV fix | eBay Downpipe w/cat | Autotech Exhaust | DDM HIDs | Bentley Manual | VCDS - Car for sale! $6,000
      [B]2008 Touareg VR6
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    3. Senior Member christofambrosch's Avatar
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      08-18-2012 08:21 AM #3
      Quote Originally Posted by Tutti57 View Post
      I would do a pressure or smoke test to see if there is a vacuum/boost leak and where it's coming from.
      I am seeing if I can source a smoke tester as I type this. I would have though with an issue this noticable that the problem would have been just as noticable by now.
      "Antequam desilirent", RIP brothers.

      Christof Ambrosch Photography

    4. Senior Member christofambrosch's Avatar
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      08-19-2012 12:12 AM #4
      Tonight the issue has been solved. I found a small crack in a vacuum hose. I missed it because it was on the underside. I threw on a hose clamp as a temporary fix and it did the trick. Just need to replace the hose.

      There is no part number for the hose itself, but the hose comes with a regulator: 1K0-612-041-GM, MSRP $68.50. So I will be just picking up some 1/2" hose and cutting/clamping a three inch section.
      "Antequam desilirent", RIP brothers.

      Christof Ambrosch Photography

    5. Member Tutti57's Avatar
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      08-19-2012 08:05 AM #5
      Perfect. I think I know exactly what part you are talking about. I broke the same one.
      2006 Passat 2.0T Tiptronic | Unitronic Stage 2 | DG Springs | Newsouth Boost Gauge | BFI Tranny Insert | Rev D DV | BSH PCV fix | eBay Downpipe w/cat | Autotech Exhaust | DDM HIDs | Bentley Manual | VCDS - Car for sale! $6,000
      [B]2008 Touareg VR6
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    6. Senior Member christofambrosch's Avatar
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      08-19-2012 10:47 AM #6
      Quote Originally Posted by Tutti57 View Post
      Perfect. I think I know exactly what part you are talking about. I broke the same one.
      It feels great to have my car back. I feel pretty dumb for missing it, but at the same time, thankful it was something small. Thank you for your input.
      "Antequam desilirent", RIP brothers.

      Christof Ambrosch Photography


    7. Senior Member christofambrosch's Avatar
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      08-21-2012 07:23 AM #8
      Quote Originally Posted by GolfRS View Post
      Here you go...
      Thank you, but I can get that part cheaper through www.1stvwparts.com. I just got a section of hose from an auto parts store and replaced the hose since the regulator is fine.
      "Antequam desilirent", RIP brothers.

      Christof Ambrosch Photography

    8. Senior Member christofambrosch's Avatar
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      08-29-2012 09:48 PM #9
      Well, back at it. Same code. Tonight I sprayed all vacuum lines in hopes of finding a leak to fix but to no avail.

      Accepting all suggestions.
      "Antequam desilirent", RIP brothers.

      Christof Ambrosch Photography

    9. Member Tutti57's Avatar
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      08-29-2012 09:55 PM #10
      Assuming you fixed that broken part, do you have a boost gauge? Is your vacuum at idle lower then normal?

      Boost leak test may show the problem.

      Dd you clear the old code?
      2006 Passat 2.0T Tiptronic | Unitronic Stage 2 | DG Springs | Newsouth Boost Gauge | BFI Tranny Insert | Rev D DV | BSH PCV fix | eBay Downpipe w/cat | Autotech Exhaust | DDM HIDs | Bentley Manual | VCDS - Car for sale! $6,000
      [B]2008 Touareg VR6
      2003 Audi A6 3.0

    10. Senior Member christofambrosch's Avatar
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      08-29-2012 10:01 PM #11
      Quote Originally Posted by Tutti57 View Post
      Assuming you fixed that broken part, do you have a boost gauge? Is your vacuum at idle lower then normal?

      Boost leak test may show the problem.

      Dd you clear the old code?
      Broken hose has been replaced. All boost gauge fittings are tight. Reads fine at idle...so I guess that points to not a vacuum leak. What exactly is a boost leak test? Old code was cleared. Ran fine after I replaced the part on Sunday.
      "Antequam desilirent", RIP brothers.

      Christof Ambrosch Photography

    11. Member Tutti57's Avatar
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      08-30-2012 09:58 AM #12
      You would take your intake off and put compressed air in the turbo inlet then spray soapy water on things and look for bubbles.

      You can make a tool on your own for around $20 or buy one for about the same. Do a search on YouTube for boost leak test and a ton of stuff will come up.
      2006 Passat 2.0T Tiptronic | Unitronic Stage 2 | DG Springs | Newsouth Boost Gauge | BFI Tranny Insert | Rev D DV | BSH PCV fix | eBay Downpipe w/cat | Autotech Exhaust | DDM HIDs | Bentley Manual | VCDS - Car for sale! $6,000
      [B]2008 Touareg VR6
      2003 Audi A6 3.0

    12. Senior Member christofambrosch's Avatar
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      08-30-2012 04:02 PM #13
      I actually searched right after I posted that. Thanks!

      But my real question I guess would be is the low boost the problem or a result of a problem? Should I be looking for a boost leak or is there another issue that can cause an under boost issue?
      "Antequam desilirent", RIP brothers.

      Christof Ambrosch Photography

    13. Member Tutti57's Avatar
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      08-31-2012 07:58 AM #14
      That's the question. How about where you intake fits to the turbo? Is that on good?

      The test will eliminate a lot of stuff and is a cool tool to have around anyway.
      2006 Passat 2.0T Tiptronic | Unitronic Stage 2 | DG Springs | Newsouth Boost Gauge | BFI Tranny Insert | Rev D DV | BSH PCV fix | eBay Downpipe w/cat | Autotech Exhaust | DDM HIDs | Bentley Manual | VCDS - Car for sale! $6,000
      [B]2008 Touareg VR6
      2003 Audi A6 3.0

    14. Senior Member christofambrosch's Avatar
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      08-31-2012 10:40 AM #15
      I went outside last night and went back to the intake. I figured that since all of this started after I installed the intake, just not immediately. All clamps after the mass airflow sensor seemed tight but I took them off and reseated everything. The clamp on the turbo inlet was tight but probably could have been tighter. So everything is not very tight (cannot be turned anymore). I took the car out and beat it for a half hour with no issues. I also ran VCDS log on blocks 31, 32, and 115. All within spec.

      So let's hope that this time I found the culprit. Thanks for your input. It sucks because I know these things, but sometimes you just need to bounce ideas off of someone.
      "Antequam desilirent", RIP brothers.

      Christof Ambrosch Photography

    15. Member Tutti57's Avatar
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      09-01-2012 12:11 AM #16
      Ok good. Maybe that's all it needed.
      2006 Passat 2.0T Tiptronic | Unitronic Stage 2 | DG Springs | Newsouth Boost Gauge | BFI Tranny Insert | Rev D DV | BSH PCV fix | eBay Downpipe w/cat | Autotech Exhaust | DDM HIDs | Bentley Manual | VCDS - Car for sale! $6,000
      [B]2008 Touareg VR6
      2003 Audi A6 3.0

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