Ladies and Gents, in the past two months I've been driving my new to me S2000 and am loving it. The more I drive it the more I notice different sounds and have been trying to fix each one as I figure it out. There is this knocking sound that knocks 1-3 times maybe at startup in forward or reverse and is coming from the rear. It doesn't make the sound everytime, and when I am driving at lower speeds....aka 20mph, I do still here a muted version sometimes. I will try to record the sounds from my car, but when its the worst at startup, it sounds something similar to the following clip that I found on the interwebs:


The searches I've made have come up with different answers. Bearings. CV joint. Axel. Tightening the bolt on upper A arm. If its super serious, I'd like to get it taken care of ASAP.

The car is a MY2006 with the following car modifications: Mugen Exhaust, JDM Password intake (currently have the stock intake installed), and aftermarket radio, all done by previous owner(s). As far as I know, these are the only modifications to the vehicle. The suspension is stock from what I can tell. The wheels are stock and have not been replaced. Fenders are not rolled.

This is my first real post, so I appreciate any feedback as well as comments on how I can improve my post to include more information. Thanks

 

Axle nut, if you tighten it, it'll kill the noise, but sometimes the damage is already done. I would do it and if the noise stops great, but start saving up for new wheel bearings and hubs.

 

...and there is a special procedure to follow. Search for the thread.

Basically, you remove the nut, lube the nut and washer, torque it down to some set amount, then tighten it an additional 60 something degrees (which turns out to be one point on nut hex to the next).

 

Thanks Fellas, I changed the video link since it was the wrong one I had intended in the original post. Does this change the diagnostic?

 

Rear axle nut TSB. Check out this video I made OP. It samples the sound as well.

 

Thanks Soviet. Want to do it for me? I don't have any of those tools

 

I'd be happy to help you out for free if you're local. Shouldn't take more than 10 mins. You can PM me.

 

You need a 3/4" big mamma jamma breaker bar, and a 36mm socket, and a strong back

 

**** me, this has to be the sound I've been hearing. Kinda hollow tapping noise at low speeds, but not just leaving a stop.

 

Usually happens when transitioning between reverse/forward from a stop.