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Audi A6 1998-2004, S6 2002 and later, allroad 2001 and later, rs6 2003 and later (C5) major vacuum leak

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Last Post: Jan 29, 2010 6:34 PM Last Post By: FKH161
cardiffkid

Posts: 2
Registered: 01/28/10
major vacuum leak
Posted: Jan 28, 2010 1:18 PM
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Hi, I have a 2000 A6 with the 4.2 engine in it.Started running really bad yesterday, missing. Got home and ran the scanner on it for the check engine light it blinking on and off. showed three cylinders were misfiring.Checked under the hood and there is a round plastic vacuum valve at the rear of the engine right behind the manifold. It's sucking air like craze.Appears to have a small vent on the top where all the sucking is taking place.Large 3/4" vacuum hoses go to it.I believe it may go the the transmission.Can anyone tell me more about this valve? Looks easy to replace but I'm not really sure that is the whole problem. Ken
FKH161

Posts: 6,346
Registered: 12/29/05
Re: major vacuum leak
Posted: Jan 28, 2010 3:30 PM   in response to: cardiffkid in response to: cardiffkid
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Attachment pcv_Vent.jpg (54.5 KB)
Have a look at the attached image... could be part of the PCV system.
cardiffkid

Posts: 2
Registered: 01/28/10
Re: major vacuum leak
Posted: Jan 29, 2010 2:54 PM   in response to: FKH161 in response to: FKH161
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Yes it is number 8 on that diagram.
FKH161

Posts: 6,346
Registered: 12/29/05
Re: major vacuum leak
Posted: Jan 29, 2010 6:34 PM   in response to: cardiffkid in response to: cardiffkid
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Thanks for posting back, a lot of people don't... which I don't get.
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