Whining noise from the engine bay when HOT
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CL63 AMG
Whining noise from the engine bay when HOT
Hi,
I'm driving 2007 V8 63 AMG (M156) with ABC. I have the following problem. After I'll go through a lot of start\stop city driving and the engine bay gets quite hot, I start hearing quite loud whining noises from the front of the car. I'm including the video with sound, so you can better understand what type of noise I'm talking about:
There is no such sounds when the engine bay is cold. Thanks for any guesses and help provided!
I'm driving 2007 V8 63 AMG (M156) with ABC. I have the following problem. After I'll go through a lot of start\stop city driving and the engine bay gets quite hot, I start hearing quite loud whining noises from the front of the car. I'm including the video with sound, so you can better understand what type of noise I'm talking about:
There is no such sounds when the engine bay is cold. Thanks for any guesses and help provided!
Last edited by HerAMG; Nov 19, 2019 at 06:15 PM. Reason: Too many videos
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Joined: Aug 2014
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S500
would probably make more sense with the bonnet open than like that
seems very odd boost leak ?
other than that, usual suspects of nasty noises making it sound like a lada are
Drive belt idler bearings fail
Super charger drive idler bearings fail
AC pulley bearing made of cheese
Water pump tends to be noisy
PAS pump makes noises
AC condenser leaks so its low on gas and you hear whines from heater area as gas goes round the system
seems very odd boost leak ?
other than that, usual suspects of nasty noises making it sound like a lada are
Drive belt idler bearings fail
Super charger drive idler bearings fail
AC pulley bearing made of cheese
Water pump tends to be noisy
PAS pump makes noises
AC condenser leaks so its low on gas and you hear whines from heater area as gas goes round the system
Thread Starter
Newbie
Joined: Oct 2019
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CL63 AMG
The sound is actually heard better from inside the car. With the open bonnet it is very hard to localize where the sound is coming from. On another note, there is no sound on idle as well. The intensiveness of the sound tight only to the number of revs of the engine.
1) It couldn't be the boost leak. It is M156 (6.2 liter atmo V8).
2) Drive belt idler bearings fail - Would order a replacement if no other option would be found. However, usually they tend to scream constantly and more when cold.
3) I have no supercharger
4) AC pulley would be replaced if no options would be found
5) It is definetely not a water pump. I have a new unit now: made no difference.
6) Power steering pump in my case is a one piece unit with ABC pump. Basically, according to my research it could actually be not the pump itself, but the damper reservoir. I just want someone to confirm that it sounds like that.
7) AC working fine. No potential issue here.
BTW, I'm asking here for help, because even indie mechanics could not find the reason of that noise and just offer me to start throwing some big $$$ on potentially faulty items.
1) It couldn't be the boost leak. It is M156 (6.2 liter atmo V8).
2) Drive belt idler bearings fail - Would order a replacement if no other option would be found. However, usually they tend to scream constantly and more when cold.
3) I have no supercharger
4) AC pulley would be replaced if no options would be found
5) It is definetely not a water pump. I have a new unit now: made no difference.
6) Power steering pump in my case is a one piece unit with ABC pump. Basically, according to my research it could actually be not the pump itself, but the damper reservoir. I just want someone to confirm that it sounds like that.
7) AC working fine. No potential issue here.
BTW, I'm asking here for help, because even indie mechanics could not find the reason of that noise and just offer me to start throwing some big $$$ on potentially faulty items.
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S500
you could take off the drive belt and see where you are... not necessarily a great idea to then drive but if the car was warmed up and you drove for less than 20 seconds it ought to be OK
one other thought, engine mounts fail (but I doubt it would make that noise)
one other thought, engine mounts fail (but I doubt it would make that noise)
Last edited by BOTUS; Nov 20, 2019 at 05:45 PM.
Thread Starter
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CL63 AMG
Engine and transmission mounts have been replaced 3 weeks ago.
Last edited by HerAMG; Nov 21, 2019 at 03:59 AM.
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S500
it will tell you loads, completely isolates the:
Alternator
Water pump
PAS pump
AC compressor
its a common trouble shooting solution, and on most mercs should take about 15 seconds to get off and 30 to refit, just don't do it for long, if you still have the noise you need to be looking elsewhwere
Alternator
Water pump
PAS pump
AC compressor
its a common trouble shooting solution, and on most mercs should take about 15 seconds to get off and 30 to refit, just don't do it for long, if you still have the noise you need to be looking elsewhwere
Last edited by BOTUS; Nov 21, 2019 at 11:54 AM.
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2009 S550, 2016 Kia Soul EV, 1973 Avanti II
I am curious what you find. My S550 has a similar noise that can't be heard standing outside. I was convinced it was my ABC pump at first, but my mechanic is sure it's the engine mounts transmitting vibration through the chassis. Sounds like a bad bearing to me! I can't tell from the video if yours is the same as I'm hearing (and feeling).
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Newbie
Joined: Aug 2020
Posts: 3
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Mercedes S65 AMG
Same issue on S65 AMG
Hi,
I'm driving 2007 V8 63 AMG (M156) with ABC. I have the following problem. After I'll go through a lot of start\stop city driving and the engine bay gets quite hot, I start hearing quite loud whining noises from the front of the car. I'm including the video with sound, so you can better understand what type of noise I'm talking about:
https://youtu.be/DaAzU0qYfh0
https://youtu.be/YeAXOG8L8GI
https://youtu.be/MfyGaxUwadY
There is no such sounds when the engine bay is cold. Thanks for any guesses and help provided!
I'm driving 2007 V8 63 AMG (M156) with ABC. I have the following problem. After I'll go through a lot of start\stop city driving and the engine bay gets quite hot, I start hearing quite loud whining noises from the front of the car. I'm including the video with sound, so you can better understand what type of noise I'm talking about:
https://youtu.be/DaAzU0qYfh0
https://youtu.be/YeAXOG8L8GI
https://youtu.be/MfyGaxUwadY
There is no such sounds when the engine bay is cold. Thanks for any guesses and help provided!
Senior Member
Joined: Jul 2013
Posts: 448
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From: Europe, but from Norway
89 SL500 Silver ,97 SL500 Carlsson 04 Mercedes SL55 AMG , 07 Mercedes SL55 AMG convertedBlack series
hi, did you change ABC pump, pulsation damper? what was the problem , your tread dont say the solution .
Senior Member
Joined: Jul 2013
Posts: 448
Likes: 48
From: Europe, but from Norway
89 SL500 Silver ,97 SL500 Carlsson 04 Mercedes SL55 AMG , 07 Mercedes SL55 AMG convertedBlack series
Member
Joined: Jul 2019
Posts: 122
Likes: 41
2007 CL600
