[Rolie]

Just wondering if anyone else hears a sound when on the throttle that is similar to pinging or rattling. With the windows down and something for the sound to bounce off it makes me feel like I'm driving an old beater.

Has made this sound similar to detonation knock (doubt it is actually knock) since brand new and typical dealership response of 'we checked and couldn't find a problem but gave everything a tighten. This is normal'.

[freshxdough]

Originally Posted by Rolie

Just wondering if anyone else hears a sound when on the throttle that is similar to pinging or rattling. With the windows down and something for the sound to bounce off it makes me feel like I'm driving an old beater.

Has made this sound similar to detonation knock (doubt it is actually knock) since brand new and typical dealership response of 'we checked and couldn't find a problem but gave everything a tighten. This is normal'.

High pressure fuel system is known to be noisy. Especially because you've heard it since the car was brand new tells me this is something natural with this engine. Pop the hood and take off the acoustic cover and you'll realize how loud that really are.

[Rolie]

I couldnt accept this was normal so did some more digging. Found this thread with the video demonstrating an identical noise as mine. Seems to be reported by others running b58 engines going years back. Signs point to waste gate rattle.
Here is the video if anyone can comment on whether their m40i makes a similar noise.