Treborsweet

Hi all i have just joined forum and need help already.
Back to a Mercedes now after coming from a 320d Touring and a W202 before that.

Problem is i have purchased a 61 plate C220 diesel @ 100k, the car is immaculate but seems really noisy to an extent it sounds like a 6.3 AMG.

At idle its normal, pull away seems really noisy then seems normal around 40mph, kick down and it sounds like noisy again, sought of like its running on 3 cylinders.

Can anyone point me in the right direction where to start looking??

Only had it a week

Thanks in advance.

dieseldoc

Can you record the noise and upload it so we can hear it.

Treborsweet

Thanks for quick reply, i will go out and record the noise and upload shortly.

Treborsweet

False alarm, got my son to drive the car past me & all is normal sounding outside, just sounds throaty inside the cabin for some reason.

Carsy

Did you not test drive it before buying?

Treborsweet

Evening all again, got paranoid again about the noise and got my son to drive it pass me again to hear the engine but once again you cannot hear the sound i am getting inside the cabin.
There is no loss of power, seems very fast, no error lights up.
Its really annoying, has anyone else had this problem? or can point in the right direction, cound it be vibrations from the gearbox.

I tried to get a recording but you cannot really hear it.

Alfadude

Is this something that just came up or was that sound always there and over time it just is starting to annoy you? Like someone else said, was it like that when you drove it before you bought it (if you even test drove it)? Can your son hear the noise?

Treborsweet

No only had the car 10 days, i did test drive it but roads were quite fast so couldnt really hear, so only getting to know the car.
My son could here the noise driving the car but i could not hear any noise outside, there a local Mercedes indy near me i will go there in the morning.

Adi-Benz

balding tires or motor/trans mounts

Carsy

To be throaty ,just wondered whether you have an air inlet leak or non OEM air filter creating induction noise or an exhaust leak.

To check exhaust for leaks just place a rag over exhaust for a few seconds to create back-pressure . A hiss noise will tell you you have a leak.

Treborsweet

Hi Carsy i tried the rag over the exhaust but could not really hear the front of the engine, might have to check air filter.

Do you think it could be a pulley, it really seems like its running on 3 cylinders if you no what i mean, but there is no loss of power.

Carsy

My diesel does have a little distinctive thrum at low speeds especially when she is working in the lower rev range. I like it, adds character!! In car parks can be quite pronounced. Cannot hear it at all at highway speed.

I suggest you check another similar car to compare.

Treborsweet

Yeah i think i will test drive one this weekend locally,
Will post back conclusions

Thanks.

Doa

Mercedes diesels make a lot of sound when accelerating.
on the other hand they make less noise then for example a BMW when they can hold their rpm