grinding noise
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Newbie
Joined: Apr 2024
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2001 ML 320 and 2010 ML 350
grinding noise
Hello all. I have a weird problem with my 2010 ML 350. There is a metal griding noise coming from driver's side engine bay. It is louder in the passenger compartment than the engine compartment. It is a steady grinding noise. The speed of grinding does not increase or decrease with engine speed but the noise itself does get louder with higher RPMs to a point. I have used a stethoscope to listen to all of the engine accessories and have not been able to find anything abnormal. I am usually good with diagnosing pulleys and or other noises. What gets to me is that the speed of the noise does not change with RPMs. The noise is intermittent. sometimes more noticeable than other times. Has anyone had this same problem and have you found a solution. Thank you.
Newbie
Joined: Mar 2024
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ML320 CDI 2006
Caveat: I know nothing about the different positioning of components between left and right hand drive ML's
Assuming the noise is when the car is stopped.
The only time I have come across something similar is when the bearings on the alternator of my old Ford Fiesta were on the way out.
Assuming the noise is when the car is stopped.
The only time I have come across something similar is when the bearings on the alternator of my old Ford Fiesta were on the way out.
MBWorld Fanatic!
Joined: Jun 2014
Posts: 1,086
Likes: 443
From: Melbourne, Australia
2010 ML550 VIN WDC1641722A564750, 2010 B180
Does it make the noise when stopped but engine running? Do you have airmatic? It might be a noisy air compressor thats worn out its rubber bushings that hold it to the chassis. That will give you a grinding type sound. Any airmatic warnings on your dash and have you scanned your car for codes?
Newbie
Joined: Aug 2024
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2010 mercedes benz ml350
Does it make the noise when stopped but engine running? Do you have airmatic? It might be a noisy air compressor thats worn out its rubber bushings that hold it to the chassis. That will give you a grinding type sound. Any airmatic warnings on your dash and have you scanned your car for codes?
Newbie
Joined: Aug 2024
Posts: 3
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2010 mercedes benz ml350
when I stop, the noise slowly starts to stop as well. But if I’ve been driving for an hour or two after the noise starts, it does continue while stopped with the engine running. One guy told me my compressor looks good but is making a noise. No airmatic warnings no. Check engine came on yesterday, had it towed to a mechanic overnight, this morning the check engine was no longer on and the noise wasn’t happening either. Been a pesky one..
power steering pump was leaking onto the compressor , and the serpentine belt was worn. Had the power steering pump, compressor and serpentine belt replaced, noise is now gone
