Hey guys I have a weird noise that sounds like small rocks rattling in a can whenever I suddenly go full throttle when low in the rpm range ~2500 rpm. It comes from my footwell and happens everytime I step on the throttle and stops immediately when I release the throttle. Any ideas what this is? The car is running great and I only put Chevron 91 in it (best we can get in AZ).

 

I think I hear that too.. Do you hear it more on inclines?

What is it!?

Thanks!
Sal.

 

i'm interested in this too!! I've had this noise for a while now and just assumed it was my supercharger going slowly, or the water pump gears, etc. I told the service guys and they've always said that they didn't hear anything unusual. Always thought i was just being too ****, as my GF says. Of course she always said that she couldn't hear anything and that i'm "crazy" or "paranoid"

 

More info in my problem.. it is a base cooper 05.. manual transmission... so no supercharger for me

 

i always had a theory that it was the bolts that hold the brake pedal cover on that were vibrating. Tough to check down there while at speed, but i have been under there to check and couldn't see much down there.

 

Mine is an 02 MCS 6spd, I have been told that it might be the supercharger water pump gears since its not speed dependent and only happens when I mash the gas. I will have to look further into it. It sounds like something is rattling around, almost buzzing when I accelerate hard.

 

Guys does it sound like 2 cue ***** hitting each other? if so it might be the CV Joints

 

if ya'll figure it out, and it's bad, let me know! (i hear it, too!) i have an '04, non S, 5-spd.

thanks!