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Please help me identify this part!

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Old Nov 25, 2012 | 02:39 AM
  #1  
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GTR
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2008 C300
Please help me identify this part!

Hey fellas,

Just wondering whether you can help me identify the part that's circled in yellow. I've diagnosed an engine whine on my 2008 C300 that appears to be emanating from this component, yet, I have no idea what it is.

Thanks!
Attached Thumbnails Please help me identify this part!-20121125_180636.jpg  
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Old Nov 25, 2012 | 08:17 AM
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E350 Sport/ML350RWD


EMISSION SYSTEM / EMISSION SYSTEM / EMISSION COMPONENTS / A.I.R. pump
A.I.R. pump 3.0L & 3.5L

http://www.getmercedesparts.com/part...iagram=5777160

Last edited by AkaSigFreak; Nov 25, 2012 at 08:32 AM.
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Old Nov 25, 2012 | 06:08 PM
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RLE
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'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
Originally Posted by GTR
Hey fellas,

Just wondering whether you can help me identify the part that's circled in yellow. I've diagnosed an engine whine on my 2008 C300 that appears to be emanating from this component, yet, I have no idea what it is.

Thanks!
That's the air pump. Does it whine all the time or just after startup?
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Old Nov 25, 2012 | 06:42 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Excess air pump. Should shut down after warm up!!
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Old Nov 25, 2012 | 09:46 PM
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2011 c300 4m
also known as secondary air pump too when searching on some sites.
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Old Nov 26, 2012 | 07:32 AM
  #6  
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2008 C300
Thank you for your responses, guys.

AkaSigFreak, are you a tech by any chance?!

That's the air pump. Does it whine all the time or just after startup?
RLE, it whines only when throttle is being applied and seems to be most prevalent around the 1500rpm to 3000rpm range.

Excess air pump. Should shut down after warm up!!
Glyn M Ruck, I cannot ascertain whether the excess air pump has shut down after warm up, but the whine is there when the engine is cold and when warmed up.

Does anyone know what the implications are for a failed excess air pump and how much it would cost to replace?
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Old Nov 26, 2012 | 08:44 AM
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E350 Sport/ML350RWD
I am definitely NOT a tech.

[ 1 ] EMISSION SYSTEM / EMISSION SYSTEM / EMISSION COMPONENTS / A.I.R. pump a.i.r. pump 3.0L & 3.5L Online Price $521.25
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Old Nov 26, 2012 | 08:52 AM
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Originally Posted by GTR
Thank you for your responses, guys.

AkaSigFreak, are you a tech by any chance?!



RLE, it whines only when throttle is being applied and seems to be most prevalent around the 1500rpm to 3000rpm range.



Glyn M Ruck, I cannot ascertain whether the excess air pump has shut down after warm up, but the whine is there when the engine is cold and when warmed up.

Does anyone know what the implications are for a failed excess air pump and how much it would cost to replace?
I'm not sure it has failed. Rather that due to a sensor input or whatever it is not shutting down. I know this is going to cost but you need to get the car onto a Star DAS to diagnose what is going on.
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