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Old 07-18-2007, 09:51 AM
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Join Date: Feb 2001
Location: Northumberland, UK
Posts: 1,294
Strange buzzing noise at 2000rpm

1999 SL500, 133,500miles.

The car makes a strange buzzing/moaning noise between about 1,700 and 2,000rpm. Sounds like it's coming from under the car. It only happens with the transmission in drive, never in park or neutral; generally only discernible at slow speeds (it may occur at higher speeds in higher gears, but I certainly can't hear it). It seems to be getting worse.

I have thought it may be an exhaust blow or the transmission. The cats are new.

I have checked and it is not the heatshield wrapped around the exhaust.

Any ideas most gratefully appreciated.
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JJ Rodger
1999 SL 500
1993 320 TE
1986 500 SEC
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