A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

Rattling noise from engine on cold startup..lasts for 1-2 secs..I searched

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Old Apr 26, 2006 | 04:42 PM
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Default Rattling noise from engine on cold startup..lasts for 1-2 secs..I searched

and found a rattling sound thread while idling..
Mine is more like a startup rattle, sounds like valves hitting something..very strange and hard to explain..
lasts for about a sec before engine goes smooth/normal..
Anyone else experience this before?
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Old Apr 26, 2006 | 04:48 PM
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Default same here mine's making some weird rattling noise as well taking it into the dealer this weekend, bu

t mine is pretty consistent.
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Old Apr 26, 2006 | 04:49 PM
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Mine disappears within a sec or 2..my car sat for 7 months..in Boston..Dont knwo if that matters
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Old Apr 26, 2006 | 04:51 PM
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i will update after the dealer takes a look at mine.
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Old Apr 26, 2006 | 04:51 PM
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maybe it's in the boston gas...j/k
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Old Apr 26, 2006 | 05:11 PM
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Default Searched some more and found this is "normal" IF it lasts for 1 sec or less

and several posts suggested using heavier oil, etc 5-40 instead of 0-40
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Old Apr 26, 2006 | 05:51 PM
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mine has done that since it was new..
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Old Apr 26, 2006 | 06:18 PM
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How many miles do you have now?Did you ever ask the dealer about teh noise?
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Old Apr 26, 2006 | 07:08 PM
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94,000.. yes, I asked but they told me it was normal.
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Old Apr 26, 2006 | 09:53 PM
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I heard that its the hydraulic timing belt tensioner ratcheting tight
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