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Noise or slight rattle

4.2K views 5 replies 6 participants last post by  kmtischer  
#1 ·
Hi Members, Exceptional forum that saves many headaches for us Mo owners.

I have a 2006 fully loaded SL. I currently have 55000 MI on it and siince a couple of months, I started hearing a slight rattle almost like a bizzing sound. It only happens under this condition described as follows;

As I accelerate from a stopped position and the rpm's go up to about 1800 and as it shifts down back to around 1400rpm, at this exact point when the down shift happen, i hear a slight buzzing sound and it only lasts if i maintain that exact point of vibration or speed. It is hard to keep it going since it lasts for about 4 seconds . I can maintain the sound by trying to follow it by slightly accelerating. It is a constant buzz. I want to believe its a rattle from a lose heat exhaust cover but it may be more mechanical.

Also note that i replaced the tranny 6 months ago and that has been working well to my knowledge.

Can this again be a tranny noise or something else? I read some stuff about engine mounts? What is your opinion. Anything else?
 
#2 ·
I am guessing engine mount. The electric engine mount can make a noise as you described but to my knowledge you can usually hear it only at lower RPM. Other possibilities could be a loose exhaust shield, or a loose tranny scoop. All of these would have been "touched" during tranny replacement.
 
#3 ·
I second that one. Do you notice a repetitive noise when you shut off the motor? When the motor mounts start to go, they will make a repetitive whirring noise. The pitch of this noise will go up if the motor is on. I find that if I leave the vehicle idling for a bit and tap the gas, I can make it happen.

Sound about right?
 
#4 ·
I also have a rattle noise come from under the car that happens only during a soft acceleration and exactly around 40 km/h. im guessing it's related to the exhaust system somewhere but don't know for sure. I think it started happening after i had one of the cats replaced under warranty last summer. maybe its related, maybe not.
i'm taking it in to the dealer regarding an issue with the tranny, so i'll keep you guys posted on what they say about the rattle.