wagon probs
Thread Starter
Newbie
Joined: Dec 2019
Posts: 11
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05 c240 wagon
wagon probs
Hey, new here, I have searched the internet high and low to try and find the answer to my problem. Heres the situation; when I go 25-29mph there is a high pitched resonating sound from the front right of the vehicle that goes higher pitch at the 29mph mark and when decelerating goes lower pitched when going 29-25. I will attach a video so you can hear the sound, I have tried to find where it is coming from, I can't find it. I have done both front axles, all the motor mounts, tranny mount, flex disks, center support bearing. Not sure any of those thing could make a sound like that. I was thinking it could be a defective center support bearing but its not a bearing noise! IDK what to do. Any help would be awesome thanks!
Junior Member
Joined: Dec 2019
Posts: 17
Likes: 3
W203 m271
I cant undrerstand.something. In the video this sound starts at 4sec,gets higher and at 7sec it stops. It appears again at 11 sec. Whats the conditions when it stops at 7sec? You are still on accelaration when it stop? If you use cruise control at the speed the sound appears,it will make a constant sound? Give more info
PS. I saw aux input in the radio. The sound appears with the radio close right?
PS. I saw aux input in the radio. The sound appears with the radio close right?
Thread Starter
Newbie
Joined: Dec 2019
Posts: 11
Likes: 0
05 c240 wagon
I cant undrerstand.something. In the video this sound starts at 4sec,gets higher and at 7sec it stops. It appears again at 11 sec. Whats the conditions when it stops at 7sec? You are still on accelaration when it stop? If you use cruise control at the speed the sound appears,it will make a constant sound? Give more info
PS. I saw aux input in the radio. The sound appears with the radio close right?
PS. I saw aux input in the radio. The sound appears with the radio close right?
Thread Starter
Newbie
Joined: Dec 2019
Posts: 11
Likes: 0
05 c240 wagon
yes, doesn't matter what gear (also put the car in neutral while going this speed and it still makes the noise) although engine speed does not matter either, i can mash the throttle or be very light on the throttle same noise at the same speed. thanks for all your help i appreciate it!
Junior Member
Joined: Dec 2019
Posts: 17
Likes: 3
W203 m271
Because of the apperance of sound regardles the rpm it could be a bearing or something between driveshaft-differential-halfshaft. Also something from the air. What i will do is a bit dangerous but you may find something. I will raise the rear end and put it on stands (from the rear lower arms, so it will have the driving height). Then put gear and reach 25-30 mph to see if the sound appears. You should have a friend so if the sound appears you will spot the place. Depending of apperanche of the sound or not will make conclusions. If you raise the car, make sure its stable
Thread Starter
Newbie
Joined: Dec 2019
Posts: 11
Likes: 0
05 c240 wagon
Because of the apperance of sound regardles the rpm it could be a bearing or something between driveshaft-differential-halfshaft. Also something from the air. What i will do is a bit dangerous but you may find something. I will raise the rear end and put it on stands (from the rear lower arms, so it will have the driving height). Then put gear and reach 25-30 mph to see if the sound appears. You should have a friend so if the sound appears you will spot the place. Depending of apperanche of the sound or not will make conclusions. If you raise the car, make sure its stable
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MBWorld Fanatic!
Joined: Jan 2005
Posts: 2,848
Likes: 15
From: Orange County
2005 C Wagon (No snickering please!)
They may all be the same size, but have worn unevenly. The same size tire from different manufacturers can have different circumferences.
Thread Starter
Newbie
Joined: Dec 2019
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05 c240 wagon
It may seem like a silly answer, but are all four tires the same circumference? You can get all sorts of silly gear noises from the drive train on 4matics with mismatched tires.
They may all be the same size, but have worn unevenly. The same size tire from different manufacturers can have different circumferences.
They may all be the same size, but have worn unevenly. The same size tire from different manufacturers can have different circumferences.
Oddly enough, the center exhaust brackets were rotted so the exhaust was hanging down; I installed a universal exhaust hanger and now the sound is almost nonexistent! Possibly the stress of the exhaust hanging down was rattling the y-pipe?
Thread Starter
Newbie
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05 c240 wagon
The sound has come back, its actually been back for a while I just haven't had the time to post on here. It seems like it happens more when the car is hot, although today it didnt make the noise at all. I also put it up in the air at my work and the noise could not be duplicated. I really think it could be the center support or a transmission bearing. Although I never heard of a transmission bearing go out on a 7226 tranny. There is also a clunk very intermittent when stepping on the gas from a stop could be related.
