2006_C350

What is this exhaust sputtering noise coming from? Is there a vacuum leak? It only happens on cold start. After the car warms up it is gone.

aamirani

Sounds like a normal cold start to me, but I have an x-pipe.

shotgun_banjo

I have the exact same thing. If i try to hit the gas right after the car started in the morning it sounds like a different engine and makes a popping sound on the muffler. I kinda liked it though.

LILBENZ230

Mine does this, too. All stock. My 2005 C230K did this to. Think it is the secondary air injection.. but not sure. Seems normal.

aamirani

That's very very bad on a cold start....

aznmode

Mine does the same and sometimes I can feel it. Like it's misfiring. After warm up, it goes away so I assume this is normal. I dont recall this happening on my previous 2005 c230 kompressor. Had that for 6 years.

dolvio

Mine does this also. I have a 2010 C250. I love the warm up sound. Totally normal.

stratman1954

my 2012 c300 does it too