Mercedes maintained car. 175,000 km. Recently started noticing a whining sound of constant frequency from near the rear differentail. Noise is intermittent and only comes after a 15km drive. Once itb starts then doesn't stop till I put the ignition off. Whine does not vary in frequency irrespective of the road speed.
Indicates a fuel pump problem as that is the only thing in that area that is ignition controlled or possibly the EVAP system solenoid/ valve if it is in that area
the frequency will be constant as the pump rpm is constant
the noise could be a venting noise from the EVAP in in that area
the distance of 15 km indicates that the problem is heat related as it take that long for something to over heat and cause the noise
you may get an indicator by running the fault code
SOURCE: car makes a whining noise when turning left or right.
hi,if you turn the steering wheel in pull position,left or right it's normal to have whining noise,the system is sefl-bleeding if there is air ,ty
Testimonial: "Thank you Mr.Domingo! You were correct."
SOURCE: mercedes benz c200 (w202)gearbox fault
There is a special additive lubricant for gear transmission to solve this problem. Just add on to gear oil. I had the same problem. now ok.
Rajapal, Malaysia
SOURCE: 1988 Mercedes Benz 300E 3.0L Gasoline F.I. ''Sputtering at Idle
ok..you must have more than one car???? you don't drive the 300 atall im guessing. #1 start car drive up the road and \back to your house. #2 let it idle till problem starts. #3 once it does start with the problem keep it alive with the gas pedal. #4 once your have it safely from dying in higher rpms "rev it" like a kid would, you know like if you were gonna race some one lol. be careful not to over rev or damage engine. you should do this for five minutes no longer than that. #5 let it idle for another 5 minutes. #6 repeat every day until problem with idling decipates. it took mine 3 300e like 3 days of this. if your not going to drive the car once you get the problem out of the way. turn the car on everyday and let it idle for 5 minutes atleast and take it for a short drive once a week. they get lonelly you know lol. later on you can just turn the car on every 2 -3 days and let it idle but still take it on a short drive atleast once a week
SOURCE: Mercedes C180 Kompresor Auto/2005
Sounds like the kompressor, the unit injects air into the motor. Its bearings are probably on the way out.
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