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1991 Mercedes 300E
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467 Posts
Discussion Starter · #1 ·
91 300E. when going at 150-180+km/h and letting the gas go and coasting, there is a noticable whistleiling/ whining sound. i dont think its the wind, what do you think it could be. also is not all the time, its interrmittint
 

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1993 300e 2.8
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208 Posts
where is the whistling sound coming from? The engine? The wheels?
 

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Mercedes-Benz
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2,245 Posts
Could it be the differential?
Do you know if the sound comes from the engine bay, transmission or from the rear of the car?
 

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95 E320 Coupe, 11 E350 4Matic P2
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1,082 Posts
hehe sorry but from your poor description of the sound it could be the birds outside it is spring.
 

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Mercedes E200 black. Mercedes 300ce - sold.
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761 Posts
could also be interference feeding back through your stereo speakers, my corrado used to whine sometimes!!
 

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1991 Mercedes 300E
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467 Posts
Discussion Starter · #6 ·
not wheels and not the sterio as i put my summer wheels and tires on last week same thing happened before and after and the sterio was off when i last checked. also you hear it from the driver seat. it might be from the engine, but i cant be sure. it cant really be pin pointed to a specific spot. but its definatly not those 2 things. so im not really sue what my next step is...
 

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Premium Member
About a dozen 1988, 1989, 1990, and 1991 sedans, wagons, 4Matics and 1 coupe
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5,510 Posts
Vacuum leak? Engine manifold vacuum goes way up during decel. Did 91s still have the economy meter in the cluster? If so is it behaving normally? Otherwise a vacuum leak could come from a brake booster or climate control system tubing.
 
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