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D3 A8L W12 - PCVs

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Old Jun 17, 2024 | 08:50 PM
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Default D3 A8L W12 - PCVs

Hi
I have a 2005 A8 W12 which has quite a vacuum when running - noticed when checking oil. I suspect that the PCVs are sticking causing this. Before i start pulling the motor down to find them - does anyone have a diagram of where they are located? I assume they are under the intake manifold but just want to be sure. Also if anyone has had same issue would be good to know if I am correct in assuming it is the PCVs?
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Old Jun 18, 2024 | 01:35 PM
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Both are located on each side in between the manifold and head toward the front side. Audi calls them "oil separators" and will have to be ordered out of Germany now. Ask me how I know. List price is $425.17 each but AudiUSAParts have them for $280.61 each. Part 07C-103-464-F for the right side and 07C-103-464-G for the left side. On mine, the plastic case split and caused a vacuum leak.

Crankcase Ventilation System for 2009 Audi A8 Quattro | Audi USA Parts
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Old Jun 18, 2024 | 03:55 PM
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Originally Posted by TSHong
Both are located on each side in between the manifold and head toward the front side. Audi calls them "oil separators" and will have to be ordered out of Germany now. Ask me how I know. List price is $425.17 each but AudiUSAParts have them for $280.61 each. Part 07C-103-464-F for the right side and 07C-103-464-G for the left side. On mine, the plastic case split and caused a vacuum leak.

Crankcase Ventilation System for 2009 Audi A8 Quattro | Audi USA Parts
Thanks very much for the advise - will remove and see if that is the issue. Also thanks for the note regards latest naming and part numbers - makes it a lot easier to track down.

Cheers
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Old Jun 18, 2024 | 06:03 PM
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The usual problem is the rubber diaphragm inside the assembly. If that is the case, do a search on ebay or Amazon and you might be able to get a diaphragm and just replace the it.
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