W211 AMG Discuss the W211 AMG's such as the E55 and the E63

Engine Knock @ Idle

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Old Mar 5, 2008 | 10:00 PM
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Chargin55's Avatar
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2003-E55 2011-C63 2016-C63S
Engine Knock @ Idle

I have a slight knock at idle straight after I have been driving hard, then the engine settles and it will kind of phase in and out while the engine idles. Same sound tappets make. Is this common?
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Old Mar 5, 2008 | 10:03 PM
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E55
yes

it is a small air valve on drivers side that makes that noise. A small
thing that makes like the engine is knocking.
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Old Mar 5, 2008 | 11:07 PM
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2003-E55 2011-C63 2016-C63S
Originally Posted by rske55
it is a small air valve on drivers side that makes that noise. A small
thing that makes like the engine is knocking.
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