Hello!Anybody can give me the rigt answer to my problem?!I am realy concerned about the 'noise' of my w211(E 270 CDI made in 2004)....When i first start the engine in the morning and when it is not flattered, i can hear a noise like a WOODPEAKER....tok tok tok tok tok).This noise it is there until the whater temperature is getting to normal....When i push the gas peddal this noise dissapears..What is the 'malfunction 'of my engine.i can't wait to get the right answer .Thank u very much!

 

Wild guess would be timing chain and tensioner?
How many miles on the engine?
Is oil full and clean?

I'd guess if the noise just doesn't stop, maybe lifters?
Can you post a video with sound?

 

The oil is completly clean,just changed,i do not use any additivs for oil.There are also new filters just replaced..i have found a similar case; http://www.youtube.com/watch?v=uS7RjEcp1dA If u can notice ,when the boy is goind to the driver's door the 'woodpeaker' sounds louder...I have bought the second-hand car with nearly 70 000 miles...First time i didn't notice the 'tok tok' but now it became realy annoying.Thank u very much,and i am looking forward for ur's new replies..

 

His sounds very normal.
If you have no sound audio we are going to be guessing only.
Have you tried a good diesel injector cleaner?
Or perhaps have the injectors serviced.
Are you using a proper diesel grade?