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TAPPING/KNOCKING NOISE..

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Old Mar 28, 2010 | 07:49 AM
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08 c200K
TAPPING/KNOCKING NOISE..
ive just brought home my c200k (2008) and absolutely loving it!! everything is soooo perfect, sooo mercedes..jus love it!

ONE PROBLEM - i hear a knocking/tapping noise at idle and low rpm.. it seems to be coming from the back, as it is louder in the back than in the front. (its almost non-existant when in the front). During driving it dissapears, wen i stop at lights it starts up agen...

any help will be appreciated
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Old Mar 28, 2010 | 08:51 AM
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Petje
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From: The Netherlands - ROTTERDAM
W205 C400
Originally Posted by shezman
ive just brought home my c200k (2008) and absolutely loving it!! everything is soooo perfect, sooo mercedes..jus love it!

ONE PROBLEM - i hear a knocking/tapping noise at idle and low rpm.. it seems to be coming from the back, as it is louder in the back than in the front. (its almost non-existant when in the front). During driving it dissapears, wen i stop at lights it starts up agen...

any help will be appreciated
May be your exhaust is knocking to your rear bumper... also had this with my Brabus exhaust, aligned it and the knocking was gone... was also only at iddle with gear in Drive
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Old Mar 28, 2010 | 09:01 AM
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08 c200K
Originally Posted by Petje
May be your exhaust is knocking to your rear bumper... also had this with my Brabus exhaust, aligned it and the knocking was gone... was also only at iddle with gear in Drive
hmm ic ic. yea that actually mite be it.. was your exhaust tip aligned or was it the muffler/catalytic converter?

THANKS DUDE!!
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Old Mar 28, 2010 | 01:15 PM
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From: The Netherlands - ROTTERDAM
W205 C400
Originally Posted by shezman
hmm ic ic. yea that actually mite be it.. was your exhaust tip aligned or was it the muffler/catalytic converter?

THANKS DUDE!!
No thanks...
It was my exhaust tip that was slightly knocking on my rear bumper.... I have lett my wife sit in the car, trans in drive and hold the brake. And than i noticed it was the exhaust. Irritating sound in the car....
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Old Apr 11, 2010 | 11:28 AM
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08 c200K
i took it down to the dealer.. they said it was the insulation around the fuel pump. They jus put more isulation around the pump but didnt replace it. i can still hear it tho...

i think im gonna hav to go down ther agen and demand a brand new pump
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Old Apr 7, 2012 | 08:24 PM
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w204
hi all,

I have EXACTLY same problem.. 09 c200k.. so did you manage to solve the problem or at least know the root cause?
anyone else experienced same strange sound?
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Old Apr 8, 2012 | 03:46 AM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Is it affected by how much gas is in the tank? If so it's one of the 2 fuel level senders under the back seat. Nothing to worry about.
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Old Apr 8, 2012 | 05:15 PM
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w204
is there any rule of thumb for it?
i.e if it is more than half tank then the noise will disappear etc ?

anyway the sound is cyclic, about 250 count per minute. it sounds like a motorboat. i can confidently say it is not exhaust pipe leak. not noticeable from outside. more prominent inside the cabin, near rear pax seat.
thanks for your reply.
Last edited by r1d3r; Apr 8, 2012 at 05:19 PM.
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Old Apr 8, 2012 | 08:23 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
250/min is not fuel senders. If it's not exhaust then I would be suspicious that it might be the EECS (Evapourative emissions control system) purge system.
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Old Apr 14, 2012 | 08:33 PM
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w204
just a quick update, i have sent it to dealer for checkup.. it is confirmed that purge valve in EECS is the culprit.. however, they said it is still within limit and acceptable level, even tho it can clearly be heard inside cabin.. nothing i can do right now even tho the car is still under warranty unless 'check engine' light comes on and error code leads to that particular system.. thanks for all replies..
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Old Apr 15, 2012 | 07:17 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Just before the warranty runs out. Make them fit a new purge valve.
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