My 1193 Mercedes 300 has almost 200, 000 km. Never driven in winter. Last year the engine started sounding like a diesel engine. The noise has slowly progressed and presently it is defnitely notceable. One mechanic informed me that it was the valves that need adjusting. Another said it is the timing chain. My own mechanic has has as of last year retired and is not contactable. Can anyone please advise what might be the problem. Other than the noise, she runs beautifully. Thank you

SOURCE: Mercedes C200 just idling accelerator does not work

Try this. Turn the ignition to position 2 and leave it about two minutes(you should hear components moving/making noise under the hood). This should relearn the throttle stop(sounds like your vehicle lost synchronization). After that period of time, start the car and see if it helps. If not, then it will probably have to go to the dealer so they can use the computer to try and relearn it.

SOURCE: 01 Mercedes S500 won't shift out of park and

Hi, Joe here, If there is no power in the vehicle, I would be changing the battery. 

SOURCE: 2004 mercedes c240 alarm sounds for no apparent reason

Hi, You need to replace the alarm siren. It is also a module. It is located in the right front fender well. The reason they go bad is because they are located in a place where they get wet.

SOURCE: POWER WINDOWS DOES NOT WORK (RANDOMLY WORKS)ALL WINDOWS

hello,first try to clean the window glass railing with cloth (a bit of oil) try to operate your window once a week if your car is not use,if possible do not force your window motor in downward or upward position,maybe the limit range in your motor is locked,resulting the window motor is stuck,ty

SOURCE: timing marks

this is an easy one to time. the timing mark for the crank is 0 degrees-do not attempt to tum crank if cam timing is out. there is no distributor on this engine-it is advanced with your intake camshaft. The intake camshaft is the only tricky part to time. Be very careful because at 2500 rpm this cam actually moves forward via cam advance solenoid. It will hit your crank if not timed properly! so with your crank at o degrees-camshafts out of head if you need to turn engine to line up crank-on the exhaust cam(your left)behind the gear(on flange) there will be a hole big enough to put a small punch in that will line up with the top of the deck surface on the outer side(to the left). Now on your intake cam(your right) it will be just the opposite. the hole on the back side of the gear flange will line up on the right with the to p the deck surface. once in line hold intake cam and turn the gear(advancer) all the way to the right)-very important. You will have to start with you intake(put chain on) then line up your exhaust and install timing chain tensioner. always turn engine 360 degrees and recheck before you proceed. At least your at top dead center and you can visually see the lobes on both cams mostly straight up. hope I have been helpful.