View Single Post
      05-01-2017, 02:30 PM   #8
austin
Private
24
Rep
80
Posts

Drives: '07 e90 335i
Join Date: Jul 2013
Location: CA

iTrader: (2)

Garage List
2007 e90 335i  [0.00]
Do you have a gopro that you can mount somewhere else on the car in hopes of capturing the sound a bit more clearly? Maybe under the hood or something.

It almost sounds like a rattle outside the engine... There's an exhaust clamp after the downpipes that is metal on metal. It's so easy to get to you could check if it's loose real quick.

Otherwise it's really hard to tell through the video...

It seems to make the noise at ~3k RPM; if you hold it there with no load will it make the noise? If not it is unlikely to be the timing chain or an accessory, because they don't care if the car is accelerating or decelerating. They only care about the speed of the engine, and acceleration in terms of RPM/time, not the acceleration of the car.

good luck
Appreciate 0