I know this post is old but it's all i can find about my problem too,
Did you ever sort the noise issue,i have an SLK 200 2012 same noise it annoys me too i can drive through it at about 3000 revs i also only hear it in sport mode in ECO mode don't hear it much,also did you take up the offer of driving another SLK when collecting yours?

 

Your car sounds OK to me. All cars make noises. My car for example, I can hear the timing chain rattling around as the engine warms up. If you are unhappy with your SLC, it's time for a Tesla - they don't make any noise.

 

Ha Ha!i have driven Eco electric buses and milk floats but they aslo did'nt have any sporty V8 noise piped into the cabin,i have also driven a remote control toy car years ago but that did'nt sound too good either!

 

Flapping noises quick checks:

Check underneath the bonnet itself. Loose fixings.

If it kicks in circa 20mph have a look at the bellypan splash guards underneath.
Can't remember how many studs, 3 or 5, but if just one is missing you get noise.

If it gets very loose it sounds like the engine is bout to go bang, it isn't.

Cheap fix, might even get it free at the Oaks. I do say 'might'.

Also check any cabling like hood release and washer bottle top
as well as the cover on top of the engine.

 

Vibration/Fluttering from engine bay

Flapping noises quick checks:

Check underneath the bonnet itself. Loose fixings.

If it kicks in circa 20mph have a look at the bellypan splash guards underneath.
Can't remember how many studs, 3 or 5, but if just one is missing you get noise.

If it gets very loose it sounds like the engine is bout to go bang, it isn't.

Cheap fix, might even get it free at the Oaks. I do say 'might'.

Also check any cabling like hood release and washer bottle top
as well as the cover on top of the engine.

I have the same problem but only when it is in sport mode eg, is slowing down and drops into first gear around 1,000rpm. When it first started to occur I got my wife to rev it slightly in the garage and found the noise coming from the rear of the engine under the plastic engine cover. I removed the plastic cover, revved it again and it appeared to be coming from the vicinity of the four little square things on the top/rear of the engine. I complained about it when it went in for a service last November and they diagnosed it as the high pressure fuel pump to the direct injectors had a valve fluttering. They said they fixed it but it started again about a week ago. I had it booked in today, I took the mechanic for a drive so he could hear the noise then on our return, everyone was scratching their heads trying to work out what it was, so it now has to go back in a couple of weeks time for three days and they will contact MB Australia or Germany to see what they can come up with. Not happy the so called experts at the dealership can't come up with an answer.
Regards
Paul...Ramprat

 

My noise sounds more like behind the Comand head unit,maybe a ventilation linkage vibrating but identical to the OP's video always seems in the centre dash speaker analogue clock area.

 

Wonder if this noise is being generated by debris in the heater air ducts? Dry leaves can make one heck of a racket inside ducts or fan housings.

 

I don't think so in my case as the noise is just a bit louder than portrayed in the OP's video an almost metalic or hard material vibrating as you drive at a certain engine speed and gear,apart from this noise in sport mode sometimes the car is refined for a convertible.i would'nt have the dash ripped out as it's far from permanent and i am pretty sure it is not Engine related.

 

There are two fans behind the COMAND. One inside the unit itself and one on the side attached to a black plastic pipe sucking hot air from the unit. Maybe one of them is touching something?

 

I have a similar issue and the dealership couldn't figure it out but the check engine light finally came on and they found out it's the High Pressure Fuel Pump. I'm still waiting on the part to come in from Germany, hopefully this resolves it.

 

Vibration/fluttering noise from engine bay





Hi everyone,
I contacted my dealer again and spoke to a different person, I informed him that it was previously diagnosed as the high pressure fuel pump and asked him to contact MB Australia. He phoned me back later the same day, he has ordered a new fuel pump which should arrive in the next day or so when it is fitted I will report if their diagnosis was correct.
Regards
Paul...Ramprat

 

Noise has returned

Hi,


I have had a SLK BlueEfficiency 2.0 2012 for about a year now and when I picked it up I had this fluttering noise and an engine warning light. The code said cam adjusters.


The main dealer replaced the cam adjusters but the noise was still there, so they then replaced the valve lifters. The dealership guy said that he guaranteed that the noise was gone!


It has been fine for about 9 months now but guess what!


I've not taken it back yet as the noise seems to come and go. It is usually in Sports Mode but I have not heard it for about 2 weeks until today.


Did any of you finally get to the bottom of this, I'm thinking of selling.:|

 

Hi,


I have had a SLK BlueEfficiency 2.0 2012 for about a year now and when I picked it up I had this fluttering noise and an engine warning light. The code said cam adjusters.


The main dealer replaced the cam adjusters but the noise was still there, so they then replaced the valve lifters. The dealership guy said that he guaranteed that the noise was gone!


It has been fine for about 9 months now but guess what!


I've not taken it back yet as the noise seems to come and go. It is usually in Sports Mode but I have not heard it for about 2 weeks until today.


Did any of you finally get to the bottom of this, I'm thinking of selling.:|

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Never sorted the noise on my car,but i'm sure mine is not an Engine problem,i'm going to put mine down to a rear Muffler delete i had as i don't think the noise i have was there before the Exhaust mod,removing 2 rather heavy boxes would change the weight of my Exhaust system and i can make the noise i described happen anytime i want as i said in my posts.

 

Fluttering noise coming from engine bay



Sorry I haven't updated my previous entries. The dealer fitted a new high pressure fuel pump and I drove it the 70km home and there was no noise, I haven't used the car for a few weeks so unsure if it has been fixed or not.
Regards
Paul...Ramprat

 

Well well Well! my car returned from it's B7 service the other day but today i just noticed the vibration at 2.5K revs in sport mode or holding it in Manual mode at around 2.5K revs has disappeared
No matter what i do to try and replicate the flutter vibration behind the speedo rev counter cluster dash area,i can no longer make my car make the old annoying noise problem i had,Now i like my car a lot more when pushing it harder.
So my service fella has screwed something down better and i'm a happy fella too now
And the car is now Taxed MOT'ed and serviced with no issues on the report,so GTG for another year only issue's were 2 front tyres near legal limit advisory,and spent a few quid on a child recognition seat pad in the one year iv'e owned it.

 

I had exactly that same noise after an oil and filter change, the noise only came at a certain speed.
As I had only changed the oil and filter I didn't have far to look, obviously it wasn't the oil, I removed the filter and the plastic mesh tube that the filter fits over had snapped.

I replaced it and the noise disappeared.

Andy

 

Hi. I have the same problem as many owners of SLK 250. Did replacement of the high pressure fuel pump solve the noise issue. I have tried many things including the dealer replacing the camshaft adjusters, vacuum pump and the cowl under the windshield. The noise is still there. Any help would be greatly appreciated. Thank you.

 

Hi Paul. I have the same noise issue with my 2013 SLK 250. Did replacement of the high pressure fuel pump resolve your noise issue. I would appreciate if you let me know. Thanks

 

I have the same issue. In “s” strong fan vibration from under the hood. In “e” not so much. Has anyone resolved it? 2013 250.

 

There are two threads regarding this issue and most of the complaints are from the 2013 SLK250. Strange that it seems to be somewhat common but Mercedes hasn't acknowledged it. From my research, I would say replace the High Pressure Fuel Pump first, then the Vacuum Pump. Both should be located at the back of the engine near the firewall. My car is under CPO warranty and has an extended warranty, but no interest by any of the dealers to solve the mysterious rattle. The rattle does go away for a while after an oil change, but returns after a few weeks, so seems like a design issue related to the oiling system. Not sure what is unigue about these 2013 models that they are most likely to have the issue. Good luck everyone! If anyone comes up with a solution, please share!!

 

If you have some place to get it up on a lift, you could take a look and see if all the shields are in place.

 

Hmm, only 5 years old but you have me thinking engine mounts.
Some 172s have fallen foul of that.

http://www.slkworld.com/gtsearch.php?q=R172 engine mounts
http://www.slkworld.com/gtsearch.php?q=R172 vibration

Time for a brew of your choice, a slice of cake and some reading.
See what you think.

 

Hmm, only 5 years old but you have me thinking engine mounts.
Some 172s have fallen foul of that.

https://www.slkworld.com/gtsearch.php?q=R172 engine mounts
https://www.slkworld.com/gtsearch.php?q=R172 vibration

Time for a brew of your choice, a slice of cake and some reading.
See what you think.

Hi Myk, in a post above you added this

If it kicks in circa 20mph have a look at the bellypan splash guards underneath.
Can't remember how many studs, 3 or 5, but if just one is missing you get noise.

Methinks this may be the cause of the noise I am hearing, afterall everything was perfect until the debris hit the bottom of the car while driving. Can't put it on a lift bcos my Indy guy has no time to do it, but thankfully the rear tires are being replaced tomorrow at a tire shop so will actually get to take a look when it goes up on the lift. Hope it doesn't need new cats.... cos that would be a bummer. Can cats be damaged just bcos some debris hit the underside of the car?

 

I had this problem on my SLK200.
Never did get to the bottom of it.

Gone now but not forgotten, maybe one day I will get another one.

 

While replacing the rear tires we had a look see and visually everything was bolted in solidly and no rattles from the underside. Then we noticed that the quad exhaust tips had somehow gotten closer to the diffuser and as it vibrates it bumps into the diffuser hence the noise.

So we moved it a tad to the right and voila no more vibration or noise.... going to watch and pay attention until time for the MB visit next week. Fingers crossed it is fixed and not about bad cats....

 

Adding pictures of the resolution....

Before (right side exhaust tips too close to diffuser generating the vibration as they bang on each other)

After (tips now perfectly balanced on left and right sides)... vibration? what vibration???:grin::grin::grin:

 

1 week later, still no vibration or noise anywhere in the cabin. Safe to say this was the cause of my issue and happy to see it resolved without needing the MB shop. Exhaust tip adjustment cost was $40. So far so good...

 

I had the dreaded fluttering / sputtering sound - now fixed...

As previously stated in this chain - I had the dreaded fluttering / sputtering sound that sounded like is was coming from the just under the dashboard (center of the dash) that would kick in at around 2500 RPM and was significantly worse in "Sport" mode with my 2013 250 r172. This went on for a year (from the day I purchased the car) until this last week. I finally got around to bringing it in. All I can say is thank the lord for extended warranties. - The cost of a "high pressure oil pump" $685, labor from our favorite Merc dealer $575; cost to Joe with the warranty - $100... Bottom line - the fix worked and I am a happy man. No more noise.

Also note that last week the "HVAC Blower" decided it was time to die - that was also fixed as well this weekend. (that would have been another $675... if I didn't have the warranty...).

So what is the lesson folks? If you are going to drive a beautiful red sports car that is the envy of everyone who looks at (save the jerk down the block with the Lambo in the garage...), be prepared to shell out the dollars or get a damn warranty...

 

Question

Hello Joe,

Thanks for sharing your repair experience in this forum as many of the 2013 SLK 250 owners if not all have the same noise problem. In the past, when the oil was freshly replaced, the noise went away and came back later. I am curious if your problem is permanently solved which will be great news for all of us. Also, where is the high pressure oil pump located in the engine compartment. I looked online but was not successful. Thank you

 

Did you mean "high pressure fuel pump" instead of "high pressure oil pump". The reason I am asking is that in many posts people mention the noise coming from the "high pressure fuel pump". Thanks

 

I had the high pressure fuel pump replaced 0n my 2013 SLK 200 about 18 months ago because of the rattle sound coming from the rear of the motor. The rattle still happens on occasion when the car is hot, on a hot day (over 30 deg) only when in sport mode.
Regards
Paul