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Old 04-25-2009, 08:13 AM
Luke Mahon
Join Date: May 2008
Location: Australia
Posts: 96
Mystery Noise

Hi guys,

Finally I have a roadworthy on the 280SE W108 - but theres one thing bugging me.

When it drives, theres a noise which is almost "ressonated" by the muffler. Its the sound youd get if you blew into a tin whistle and no notes came out, just that sound of whistling air. And its quite loud - very noticable.

To my knowledge it isnt affecting the cars performance, but its very annoying to listen too.

It only happens if the car is rev'd, or when going up through gears (auto) especially up hills. The man who replaced the muffle doesnt know what it is, and the mechanics dont know what it is. Mind you it hasnt seen a Mercedes Dealer yet - for the simple reason Im not a millionaire.

Has anyone else had this problem?? Any info would be greatly appreciated.

Cheers, Luke

1971 280SE - The S Class
1974 280CE - Sterling
1988 300E - Stanley
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Old 04-26-2009, 08:44 AM
wbain5280's Avatar
Registered User
Join Date: May 2001
Location: Northern Va.
Posts: 3,386
It sounds like an intake whistle. Check the throttle plate for proper setting, as it it's not used for setting the idle speed.


Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL


Not part of the in-crowd since 1952.
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Old 04-29-2009, 06:52 AM
Registered User
Join Date: Jun 2004
Location: brisbane,Qld.Australia
Posts: 2,062
Are you 100% sure you don't have an exhaust leak?
Try ,with the engine idling,blocking the exhaust with hand and a cloth .If it's leaking you will soon hear the gas escaping from the holes .
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Old 04-30-2009, 08:58 AM
Registered User
Join Date: Aug 2007
Location: Middle Haddam, CT
Posts: 308
If you didn't have the sound before you replace the exhaust system, there isn't much point in looking elsewhere. I'd look for not only an exhaust leak, but also a crimped pipe, and finally I'd have to conclude that the muffler itself may be defective.

Berfinroy in CT
Present vehicles:
1973 300 SEL 4.5
1959 Rolls Royce Silver Cloud I
1959 Ford Thunderbird convertible/430
Past vehicles;
1958 Bentley S 1
1976 ex-Max Hoffman 6.9
1970 300SEL 2.8
1958 Jaguar MK IX
1961 Jaguar MK IX
1963 Jaguar E-type factory special roadster
1948 Plymouth woody
1955 Morgan plus 4
1966 Shelby GT350H Mustang
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