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D3 - Engine Bay Everything under the bonnet

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  #1  
Old 17th May 2019, 09:14 PM
Prefferle Prefferle is offline
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Default S8 D3 BSM Vacuum system

Hi folks,
Can someone point me in the direction of a circuit / layout of the vacuum pipes on the 5.2 D3 S8?
I can trace these lines easily enough under the hood to secondary air control and the air valves on either air filter housing all originating from the inlet manifold however, vacuum hoses disappear into the wheel arch going somewhere else. What else is connected?
I’m trying to resolve a vacuum leak and when I remove the pipe from the inlet manifold and connect my manual vacuum pump into the circuit there is air getting in somewhere...

Any thoughts?

Cheers,
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Old 17th May 2019, 09:20 PM
ainarssems ainarssems is offline
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While I am not that familiar with D3 S8, there is probably vacuum accumulator in wheel arch and I think there are vacuum valves for exhaust switch over.
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Old 17th May 2019, 10:10 PM
Prefferle Prefferle is offline
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Thanks for that - I was suspecting that when the miltek exhaust was fitted the vacuum lines may be leaking/ not properly sealed off...
I was hoping to verify that vacuum lines had no other functions outside the engine bay.

Thanks,
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Old 17th May 2019, 11:17 PM
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steamship steamship is offline
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Hopefully this should help.

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