Mysterious Intermittent Humming Noise

2913 Views 3 Replies 3 Participants Last post by shek33, Jul 18, 2009

bombasticall

Discussion Starter · Apr 3, 2009

Hey, I have an '04 E-320 and I have the following problem. I want to pin down the cause so I can take it to a mechanic and tell them what they should look at.
There is a humming noise that changes with the speed the car is going at. I have recently noticed that the humming gets more intense as I veer left. It is more noticeable at slow speeds and it makes the car vibrate a bit. The humming starts slow and increases in frequency until it blends in with the road noise but it can still be felt in both the steering wheel and the pedals.
The humming is not constant, it sounds something like voom...voom...voom... and the frequency varies with the speed.
Thanks

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shek33

· #4 · Jul 18, 2009

bombasticall said:
I will check the tires. I just did a rotation and balance on them and was not told that they were bad. I will ask them to check this time. Also, could it be a bearing problem?

Eric242340 is right! I had the same humming noise as described by Bombasticall at low speed. My car is a 2004 E270 CDI which has done 33000 miles on a second set of Pirelli PZero tyres replaced at around 15000 miles. The rear tyres worn out more quickly than the front set just about the legal limit, so I decided to change them with a new set of four tyres to the original MB softer Continental Premium brand. Vow, what a difference with all the strange humming low speed worn tyre noise has now completely gone!

And of course the car is quieter too even at high speed.:thumbsup:

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