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  #1  
Old 02-19-2002, 01:23 PM
gman1
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Question Air Pump making muffled noise

I have a 90 300E 2.6 that has started making a muffled noise somewhat like an exhaust leak. It appears to be coming from the air pump. It cycles on and off during idle.

Can anyone help me with this problem. If the air pump need replaced, where can I get a rebuilt one. Doing a quick online check to the benz bin indicates that a new one will cost $676.
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  #2  
Old 02-19-2002, 07:18 PM
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Location: Austin, TX
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Do a search, someone recently posted they bought one for $290.00. That's what I paid for one a month ago. Call Texas European Auto Parts. 1-512-873-0586.
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91 300E 120K
90 300SE 275K (sold)
92 BMW 525iM 120K
90 BMW 525iA 175K
85 300D 175K (sold)
84 300SD 245K (sold)
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Old 03-25-2002, 11:24 PM
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AIr Pump replacement

German Star is a good source. Has rebuilt air pumps with 1-year warranty for $325.
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Old 03-25-2002, 11:31 PM
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Join Date: Jun 2001
Location: Houston, Texas
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gman1:

Have you ever had an oil leak near the AIR pump? (head gasket or timing cover leak?) I had that muffled noise as well, until I discovered it was a bad rubber elbow hose that connects to a metal pipe which in turn goes to the head. (oil had expanded and ruined it) There are actually two of them down there and they are elbow shaped.

Check those for leaks before you conclude that your pump has gone bad.

Good luck...

~Paul

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