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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 07-19-2011, 03:19 PM   #1
2001-330ci
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Join Date: Jul 2011
Location: georgia
Posts: 1
My Ride: bmw 330 ci
Help: Exhaust rattle

First time poster, long time reader. I have a 2001 330ci which has a bizarre rattle. Whenever the car is under load or facing down hill, if the RPM's are between 1500-2000 there is a high pitched rattle somewhere under the car ( I think). The sound is like a coin in an aluminum can being shaken. On a prior car, I had this sound and it was the heat shield. Well, no heat shield on the BMW.

I have taken it to the dealer and two repair shops - no luck in isolating the sound. The sound ends once the RPM are above the 2K mark. Oddly, if I down shift and RPM's are falling, the sound comes back between 1500-2000 as well.

I did run over a tire prior to the sound beginning, and the central muffler has a small dent in it. Still, the sound could not be reproduced on the lift when taken to the repair shops. I am tempted to just replace the central muffler, but that is around 1K per the dealer.

One shop told me the sound is because there is a valve in the exhaust which opens at certain RPM's and is the cause. Also, they said the sound is normal. I don't remember it being there before I ran over the tire though.

Any thoughts?
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