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Registered 2012 SLK55 AMG w/P30
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3,471 Posts
Discussion Starter #1
This was after sitting overnight.


My exhaust pipes are black, like I’m running too rich.
 

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Super Moderator UK SLK 55 AMG 2007
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27,257 Posts
Can't be sure it is this.

I think someone with exhaust valves had this and the valve was sticking.
Does the 172 have those?
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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13,182 Posts
I can't tell diff from mine (although my valves stick then settle down, cold or warm start so I get a rattle which disappears after about 3-4 seconds).
 

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Registered 2012 SLK55 AMG w/P30
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3,471 Posts
Discussion Starter #4
By the way, Len, that was a slow-motion 240 frames per second. Myk, I do think there are exhaust valves on the M152 engines. :grin:
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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96,412 Posts
try a non slow mo so we can hear normal speed
 

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Registered 2012 SLK55 AMG w/P30
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3,471 Posts
Discussion Starter #6
I was actually more interested in any particulate matter seen in the exhaust. That’s why recorded it in slow motion. Does anybody see smoke, either unburnt fuel or oil?
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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96,412 Posts
overnight? but it is 7 pm now?
you need to try it in the morning no?
 

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Registered 2012 SLK55 AMG w/P30
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3,471 Posts
Discussion Starter #8
I recorded this a while ago. Just got around now to posting it. Busy life and all that you know, much as people might think I do not live for my car. (Yes, I know heresy)
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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13,182 Posts
I recorded this a while ago. Just got around now to posting it. Busy life and all that you know, much as people might think I do not live for my car. (Yes, I know heresy)
I thought I was imagining it BUT yes, I saw a faint (largish) cloud come out at start. I don't have that.

If that is normal for you, I would imagine you're adding every few thousand KM. Only time I add (and thats been 2x in about 14K KM) is after a whole lot of exhilarating driving :wink: (which does NOT happen only 2x/yr).
 
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