I took a video of the gurgling sound that the Mechanic’s say is normal. Every time a new person gets in the car they ask what is that noise. I always said I was told it was normal. I decided to take a video once and for all to see if you guys and gals think it’s a normal sound. Not the turbo whine. Listen for the gurgling noise. Can’t hear it outside the car. Only inside under acceleration. If it’s normal then fine but I need to know

I posted this in the coupe section please delete that post if possible. I was told no one ever goes there anymore.

 

Very strange noise indeed almost sounds like a misfire, definitely not normal,

 

no lights and car runs great. Mercedes mechanic said it’s normal. I don’t get it.

 

Are your windows open in the video? I would assume so, possibly an exhaust leak?

 

yes. Can’t hear it at all outside of car regardless. Only when driving. Seems to be coming from the passenger footwell area. Only under acceleration. Engine runs nice and strong with no hesitation.

that was in park revving it up in the driveway.

 

Oh wait, its a 4cyl c250.. I'm not sure then, those engines are crap, unfortunately, the mechanic is probably right.

No offense but the v6 is a much better engine for these cars, even the sound is 10x better/smoother with a v6. I've heard some of these 1.8L engines in the c250s and they sound horrible. Don't worry yourself about the noise, its most likely normal, I would plan instead on trading it for a v6 however in the near future.

What you hear is the turbocharger which is located on the passenger side.

 

if it’s normal then great. I personally don’t mind it. Just want to make sure before I drive myself crazy.

 

I thought a turbo was that whine sound?

 

Any chance part of the exhaust system having interference problems/touching the frame or other components on that side?

 

From what I looked at it all looked pretty normal to me.
ill put it up on ramps later and poke around with a prybar to see if the sound changes. Can’t hear it at all outside the car. It’s strange.

 

I pulled each coil one at a time and they all change the way the engine runs so I don’t believe it’s a misfire. Put the car on jacks and nothing seems to be hitting underneath. If it’s the way it supposed to be then I’ll live with it.

 

I’m leaning towards exhaust leak somewhere around the cat

if I use a leaf blower or a fog machine (I have one from Halloween). Will any of this hurt the motor as long as it’s cold.

 

Hi, that sounds like an intake roar to me. If its not normal or to loud, I will check/remove the aircleaner system and have a look whats going on there. To me it does not sound like an exhaust leak, or a misfire.
One hear this exact type of a sound where aircleaners are replaced with aftermarket filters, I mostly heard it on VW's.

 

its not “loud” but it is enough that when people get in they ask what is that. What exactly am I looking for and is this a big deal to fix if it is something with the intake?

 

You will have to know how the intake should be, and then determine if it was altered in any way. I would go for a ride in a similar car for a start. I would not dare to ask if they forgot to put in the new airfilter, or it came loose in the housing-?

 

Let me pull off the air box and see if their is anything obvious. I mean again I don’t think it’s affecting anything but would like to figure it out. I did listen to some you tube videos and that may be exactly what it is.

does anyone know if we have any flaps or doors that open/close I should be looking for etc? If I leave it as is should I have to worry about anything?

 

That is very typical sound for your car. Watch this video at the end starting at 7:43 and you'll hear the engine revving and the turbo blow by valve noise, particularly at 7:58.


I wouldn't stress over it.

 

turbo noise sounds normal but I don’t hear the growl.

 

Balderdash. Please prove your statement.

 

thanks because I heard just the opposite.

 

Everything that you hear isn't true. Take for example, most of the people who speak out against the M271 have early model W204's with V6 engines. Nearly all of said people, you included, have never owned the engine that you speak of.


OP - the sound is definitely not normal

 

I meant I heard all good things about it. So just the opposite.

 

I am the OP lol. I appreciate you defending my engine lol.

 

Sorry, I confused you with another person who replied to the thread.

 

I just want to figure out what it is so I can enjoy my new car and not worry about it anymore. Just spent 1200 on a fuel pump.