M275 "whoooooo" noise on quick throttle release
Thread Starter
Member
Joined: Jul 2019
Posts: 122
Likes: 41
2007 CL600
M275 "whoooooo" noise on quick throttle release
Hi everyone,
This may be totally normal but in the last few months I have noticed a "whooooo" noise when stabbing at the throttle pedal that I don't think was there before.
Only really happens with a quick press and release of the throttle while in gear. Is this normal?
I hope to get a recording of the sound if there are no obvious answers.
Thanks
This may be totally normal but in the last few months I have noticed a "whooooo" noise when stabbing at the throttle pedal that I don't think was there before.
Only really happens with a quick press and release of the throttle while in gear. Is this normal?
I hope to get a recording of the sound if there are no obvious answers.
Thanks
Super Member
Joined: Dec 2015
Posts: 502
Likes: 145
From: Tampa Bay, FL
2014 E350 Wagon, 2009 SL550 no ABC
Not normal. The first thing to check are the various pulleys which route the serpentine belt - those are service items and need replacement once in a while. When the bearings go bad, they start making various noises on acceleration/deceleration. If you take them out, they may appear to be perfect without any play, replace anyway as they are still likely the cause. If a pulley fails completely, it will shred the serpentine belt making the car not driveable at the most inconvenient time and location (ask me how I know)
If replacing the pulleys does not fix it, the next one will be the round metal pulsation damper on ABC pump, also a service item which needs a periodic replacement. There may be many other reasons too, but those 2 are the most likely and worth replacing regardless (if not done in the last few years).
Please keep us posted on what you find out
If replacing the pulleys does not fix it, the next one will be the round metal pulsation damper on ABC pump, also a service item which needs a periodic replacement. There may be many other reasons too, but those 2 are the most likely and worth replacing regardless (if not done in the last few years).
Please keep us posted on what you find out
Thread Starter
Member
Joined: Jul 2019
Posts: 122
Likes: 41
2007 CL600
Collapsed engine mounts were the cause. I can only imagine the quick press and release of the throttle was causing the engine to move and loosen off the intake hoses to the air filter housing.
Member
Joined: Apr 2017
Posts: 134
Likes: 28
2014 ML350
Sorry to jump on this thread with a different issue/question. I need to replace my pulsation damper on my 08 65. Can I do this without losening the pump from the engine and will I introduce air to the system by doing this? From the look of it, I think I can just unscrew it from the bolt head that's welded to it after I remove a few hoses. Any help is appreciated.
