E-Class (W211) 2003-2009

Engine chirping noise, 2004 E320 V6 4Matic Wagon

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Old 03-18-2015, 04:07 PM
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2004 E320 4Matic Wagon V6
Engine chirping noise, 2004 E320 V6 4Matic Wagon

I'm getting a sound like crickets from the engine. It occurs under acceleration (even slight acceleration) and seems to be related to engine vacuum, not speed or rpm. I can't get it to happen with no engine load so I don't think it's the belt or tensioner.

It started about a month ago and is steadily getting worse.

The references I found suggest trouble with a supercharger but I don't think this engine has one, does it?

Thanks for any ideas...

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