2013 SLK55 rattle on startup - Mercedes Benz SLK Forum

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#1 Old 02-11-2013
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2013 SLK55 rattle on startup

When I start the car I hear a metal rattling sound coming from under the car that goes away after a few seconds. At first I thought it might be something like a loose heat shield on the exhaust. However now that I think about it, it may be the exhaust baffles. Anyone else hear this on startup?
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#2 Old 02-11-2013
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Do a search for r172 exhaust manifold.


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#3 Old 02-11-2013
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Crud, it couldn't be something simple could it. Guess I'll have to take it in. Thankfully the weather is nasty this week so I won't miss it.
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#4 Old 02-11-2013
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When mine starts up, just a very nice growl (I never get tired of hearing it!) - no metallic or rattling, etc. that I can hear. I do occasionally get a very mild tapping for a few seconds until the oil pressure builds (I suppose that's what it is). I have 5600 miles and nothing like a rattle yet.
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#5 Old 02-12-2013
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rattle

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Originally Posted by JumpinJim View Post
When I start the car I hear a metal rattling sound coming from under the car that goes away after a few seconds. At first I thought it might be something like a loose heat shield on the exhaust. However now that I think about it, it may be the exhaust baffles. Anyone else hear this on startup?
when i started mine for the first time i heard that rattle as well and the first thing i thought of was the baffles so keep us posted on what you find out.
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#6 Old 02-13-2013
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when i started mine for the first time i heard that rattle as well and the first thing i thought of was the baffles so keep us posted on what you find out.
It has a Dr. appointment tomorrow so we shall see.
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#7 Old 02-13-2013
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Turned out to be a loose exhaust clamp. I'll take it home and see if it still rattles in the morning after a long cooldown.
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#8 Old 02-14-2013
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Good news

That's good news . I'm going to take the cover off of mine and start it up a few times and see if it's still there.....time for a quick spin up and down our condo's 4 level parking garage anyway. Damn Canadian winters . Lol
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#9 Old 02-14-2013
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Well that wasn't it, at least not entirely. Still hearing a noise. A very mechanical noise, a ticking noise. Seems to only happen as part of the cold start process. If it's warmed up it it will make no noise. If I cold start then turn it off right away and turn it back on, no noise. Hmmm, what could it be?

I took a little video.
http://s1237.beta.photobucket.com/us...a1eaa.mp4.html
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#10 Old 02-14-2013
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No noises from me on start up, just the lovely growl referred to before.

The guys at work reckon it shakes the windows on start up.......

RR
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#11 Old 02-14-2013
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time for techron!!! (or a new v belt!)

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#12 Old 02-14-2013
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Just listened to your video. I've been following this post because my 2013 SLK 350 sounds the same. Mine and others make a similar sound starting warm and or hot. MB tells me they are aware of the noise and its normal. I hope you get it resolved.
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Last edited by tlppsp; 02-15-2013 at 08:49 AM.
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#13 Old 02-15-2013
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Rattle

Wow that sounds bad to me. Going to go and record the sound from mine and compair. From what I remember it just sounded like a tinny tapping sound for a few seconds .
Thanks a bunch for keeping us posted!
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#14 Old 02-16-2013
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Word is now they think it may be a timing chain tensioner of which the slk55 has 3, but they won't know for sure until they open it up which won't be until Mon.
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#15 Old 02-17-2013
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Damn

Well if that is the problem thank god they caught it ! Strange to think that could have come from the factory like that being a Amg one man one engine.
Good luck and Please keeps us posted this is most disturbing!
I started mine 4 or 5 times the other day and recorded it but it just sounds tinny
When I did hear it the salesman had started it up and I was standing behind it as he pulled it out of the showroom , it's hard to tell now being underground and the echo is crazy. I'll have to wait for spring to get it out side. Damn Canadian winters.
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#16 Old 02-21-2013
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All the timing chain tensioners were replaced. Car still makes the same noise. Back to the drawing board.
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#17 Old 02-22-2013
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Sounds even more wonderful from under the hood.

http://s1237.beta.photobucket.com/us...474df.mp4.html
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#18 Old 02-22-2013
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v belt.......


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#19 Old 02-22-2013
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Too metallic sounding for that I think. Belts usually squeal, not knock.
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#20 Old 02-22-2013
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my v belt ticked:

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