saltydizzle

hey guys, from a stop, when i accelerate hard, i hear a clunk from the rear. its only from a stop and only when i get on the throttle. under normal driving conditions, or accelerating slowly from a stop, there is no noise. anyone know what this could be? My coilovers are practically brand new and if its the shocks ill be pissed. any help is appreciated as always. Thanks.

Jjwilbs

i took my 350 to the mb dealership over this - i left a water bottle in the boot - oops!

bheng

i would suggest the same. anything loose in the boot? or back seat. i left a can of window cleaner and when i accelerated hard it made a clunk.

saltydizzle

hmmm i had my snow removal tool back there. im gonna take it out and see if it stops this afternoon. thanks guys.

dynomite05

When I switched my tail lights I completely took apart the trunk lining...You wouldn't believe some of the stuff I found rolling around...Definitely take some time and lift the liner to see if anything is back there...Maybe something is loose

saltydizzle

ok cool...i will check that out tonight. Thanks wes.

M-bENZ

make sure u dont have cans rolling around in your trunk or personal stuff laying around it will caused the noise...

Andy

saltydizzle

yeah i think it might have been my snow removal tool that was hitting the trunk. Im gonna check that after work as well as lift the liner as dynomite suggested

saltydizzle

Ok so I removed the snow removal tool and have nothing else in my trunk. I lifted up the lining and there is nothing. I do have my spare and all equipment in there. Could that be the source of the noise?

dynomite05

I had stuff rolling around the sides by the amp. There is a pocket there were things gather, have you checked that?

saltydizzle

Yeah the only thing in the right side pocket was a piece of zipper that I just found. Other than that nothin.

bheng

i would put my money on the snow removal tool for the reason causing the noise. Mercedes actually has good dampening for the stock sound system. they have a layer of dampening on the doors.

but only way to find out is to floor it and see =D

saltydizzle

Well I can tell you guys it's nothing in my trunk making that noise. I believe it's the rear suspension. If I put enough preside on the rear it "knocks". ****in brand new suspension and I already have to go to the shop. Again.

saltydizzle

Should say pressure not preside

dynomite05

Ouch! I feel for you man...Lets hope it nothing serious or maybe the camber kit and not the suspension

saltydizzle

Yeah i was thinking it could possibly be that too. I really hope that's the case and it's not the suspension.

camerri

Okay, so you may have gotten this problem fixed already and if so, great. However for anybody else searching through here with the same problem I thought I would give the resolution the dealer did for me with my similar problem.

I had the exact same clunk and squeaky noise from the rear of my car. The clunk happened at low speeds and either over speed bumps or going around a corner up hill at low speeds. Sounded kind of like metal on metal. So I took it into the dealer and luckily on our test drive I was able to reproduce.

The squeaking noise was the rear sway bar link arm and they replaced it under warranty, the clunk was an unseated spring in the rear. They re-seated and rotated the spring and now no noise. Not sure if this is your problem or not, but it's worth a shot.

Good luck!

2MCHCAR

I'm having a similar problem, thanks for sharing your experience. I'll update the tread when I have my problem figured out.

gaiex

I also have KW V2 and started to have a vibration on the rear when passing the 3000rpm!
Checked all the suspension, even teste the shock on a shock tester machine and they look to be ok , only a 2 % difference from left to right at the rear.

Don't know what to do... will leave the car at the dealer to check engine and transmission mounts...

FastDonzi

guys,i also have some clunking going on back there.it seems to me that when you lower and stiffen the car things wear out much faster.a thorough investigation of the undercarriage by my mechanic reveled collapsed cross member mounts.makes sense

saltydizzle

hmmm that vibration is weird....i have never had anything like that with my KW V2. But my clunking noise also has gone away for quite sometime now. I think it had something to do with when the car was lowered, it was in between clicks (if that makes sense)but im not completely sure.. It sounded like shocks were going..but like i said, i havent heard it for a long time now and hopefully it doesnt come back.

saltydizzle

That does make sense...ive also heard that it could be the sway bar links that are worn and need to be replaced.

gaiex

I have the back end at the top of the lenght of the KW V2 travel, and add it almost at the bottom and didn't had this vibration!


PS: Did you guys let the stock shock rebound setup of the KW V2 or did you changed it rigth away?
I have all as they came from factory, and I like it, but the rear is more harsh then the front, I'm thinking putting a bit more rebound at front.
I will also try to put less rebound at the rear to see if it gives a different result with the vibration.

PH1L

i also have some wierd sound from the back after changing frm HnR to KW (cause my there some problem with the HnR been using it for few years)... anyway i took the car to merc and found out that the bolt on control arm is not properly tighten...

waveterrorist

the dealer could not find anything relating to my 'clunk'
i think it is related to the electronic stability control

straight ahead launch yields nothing
only happens to me when moving from stop and turning the front wheels



only happens to me when moving from stop and turning the front wheels