Knocking Noise

BenzNut4life · 08-22-2007, 05:40 PM

When I start my 02 C320, I get this knocking noise (in a rhythm)behind the radio. It sort of sounds like someone tapping plastic with their finger. It sounds to me like a vent or something is trying to open but is stuck. It does this for about 30 seconds or so then stops.

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Shake · 08-22-2007, 05:44 PM

I get a similar noise coming from the rear. I think this problem is common on a lot of the C-classes.

dnegri · 08-22-2007, 09:59 PM

Quote:

Originally Posted by Shake

I get a similar noise coming from the rear. I think this problem is common on a lot of the C-classes.

I am experiencing that same problem from the back end. Its driving me nuts and I can't seem to duplicate the noise for the dealer.

Shake · 08-22-2007, 10:03 PM

Quote:

Originally Posted by dnegri

I am experiencing that same problem from the back end. Its driving me nuts and I can't seem to duplicate the noise for the dealer.

I think Sanf (a member here) or someone else took it to his dealer to get it fixed. They took the back wheel off and checked the area. My sound i think is coming from the right rear tire area

It only comes for like 15 seconds at Stoplights and then turns off. I don't think it can be fixed.

Ryanr317 · 08-22-2007, 10:06 PM

I believe that's the stepper motor linkage issue. Mine has been doing it since i got the car last year and i've just been ignoring it. It goes away after the first few secs.

dnegri · 08-23-2007, 09:03 PM

That's funny....mine does it too for approx. 15 sec and it only happens at redlights or whenever I'm at idle. I describe the sound as if your tapping your finger on your desk lightly w/out the use of your fingernail. Try it......taht's what it sounds like. haha

LuxuryC240 · 08-23-2007, 09:07 PM

I have it too, its doesnt bother me...this was one of the first things I learned about as a MBWorld member..

sanf · 08-23-2007, 09:52 PM

Quote:

Originally Posted by Shake

I think Sanf (a member here) or someone else took it to his dealer to get it fixed. They took the back wheel off and checked the area. My sound i think is coming from the right rear tire area

It only comes for like 15 seconds at Stoplights and then turns off. I don't think it can be fixed.

yea man. there's nothing they can do. the last thing SA told me was "newer C, E, CLS...they are all making the same noise coming from the right rear area and there isn't a thing to fix it"

get into a habbit of throwing your gear to N at stop lights. that will take care of it.

08-22-2007, 05:44 PM	#2
Shake MBWorld Fanatic! Garage is empty, add now Join Date: Mar 2007 Location: Mid-west Posts: 5,892 Drives: IS300	I get a similar noise coming from the rear. I think this problem is common on a lot of the C-classes. __________________

08-22-2007, 10:06 PM	#5
Ryanr317 MBWorld Fanatic! Garage is empty, add now Join Date: Jul 2006 Location: Central Florida Posts: 2,142 Drives: C320, ML320, NSX, SC400	I believe that's the stepper motor linkage issue. Mine has been doing it since i got the car last year and i've just been ignoring it. It goes away after the first few secs. __________________ 1992 NSX \| Berlina Black/Ivory 1999 SC400 \| Black/Black

08-23-2007, 09:07 PM	#7
LuxuryC240 Super Member Garage is empty, add now Join Date: Jan 2007 Location: Boston Posts: 974 Drives: 2003 C240	I have it too, its doesnt bother me...this was one of the first things I learned about as a MBWorld member.. __________________ 2003 C240 25% Tint / 19" Giovanna / S-Tails / Depo Projectors w/ 8000k / Clear Fogs with Silverstars / LED Footwell Lighting / Clear Side Markers / Chrome Door Pins + Surrounds / Puddle Lights / Schatz Shift Knob / Custom Ashtray Delete / Custom White LED Mirror Blinkers Coming Soon: K&N Air Filters

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08-23-2007, 09:03 PM	#6
dnegri Member Garage is empty, add now Join Date: Jul 2007 Location: Wilmington, NC Posts: 78 Drives: 2006 MB C230 Iridium Silver, 2007 Hummer H3 Slate Blue	That's funny....mine does it too for approx. 15 sec and it only happens at redlights or whenever I'm at idle. I describe the sound as if your tapping your finger on your desk lightly w/out the use of your fingernail. Try it......taht's what it sounds like. haha

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08-23-2007, 09:52 PM