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Old 10-06-2002, 10:56 PM
Registered User
Join Date: Oct 2001
Location: Canada
Posts: 298
Jet like sound from 400E

I have been having this question ever since I bought my 92 400E, the car drives perfectly, but each time when launch from stand still, I can hear it makes a special sound, it feels like a jet turbine just starts, "humm...", the sound goes way after rpm reaches 2000.

I am not sure it is from engine or transmission, the sound is not loud at all, it sounds not bad either, but I have never heard this kind of sound from any other car I have driven.

400E owners, is this sound normal for your 400Es?
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.
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Old 10-06-2002, 11:27 PM
Registered User
Join Date: Aug 1999
Location: ajax, ontario, canada
Posts: 773
if that happens when the engine temp is relatively high, then that could be your engine fan.
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Old 10-07-2002, 01:34 PM
Registered User
Join Date: Oct 1999
Posts: 1,562
V-coupling may be locked in place causing fan whirl- jet like sound
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