My mercedes s430 is making a loud screeching noise when i turn the steering wheel. Would that be the power steering going out?
Is most likely make noisy from ball joint please check both front lower and upper boll joint and replace one which is faulty one. is this information helped you?
there are so many things that can cause rough idle, can you give more information? did the car recently overheat? is there any fluids leaking on the engine? are you getting any smoke or steam from the exhaust? when checking for steam, remember to wait until the engine has run for awhile as condensation can build up in your exhaust during the night. if you cannot tell if it is smoke or steam, hold a blank sheet of paper behind the tail pipe, if it is oil smoke, then oil dots will show up on the paper.

some things you can do and check;
check the spark plug wires, make sure they are tightly connected and not chaffed, broken or burnt.
check your pcv valve for excessive oil or clogging, (it will be in a rubber housing or hose leading from your valve cover to your throttle body/carburetor)
i don't know the engine setup in that model, but if you have a distributor cap, check it for cracks and wear, also check the rotary cap.
check all rubber vacuum hoses on the engine for cracking.
if you can afford it, change the spark plugs, plug wires, rotor and rotary cap, these parts all need to be changed over time and your car is getting older now. hard to describe this, but remove the knee bolster and remove the upper mounting screws and remove shifter indactor and the steering column 4 nuts and lower down to get the upper bezel out, sometimes it is hard to pull out, then remove the 4 screws and pull the speed head out and unhook the rear wiring harness **bleep**… it was the powerline… duh! maybe the smoke is coming from your *** the clutch might be smelly, but is it slipping or doing anything else untoward. clutches are a regularly reported problem on one-tonne utes, which suggests most are borderline in capacity. if there is a problem with the functioning of the clutch, approach mazda again about replacing it. if there isn't a problem think about replacing the clutch with a heavy-duty one that's more capable of handling your towing needs. I had same problem it is a ground wire broken in the harness rubber boot between dthe driver door. Peel back the rubber that protects wires and you will find broken ground wire(black) add a piece of wire solder and wrap with electrical tape put rubber boot back into door everything should work. time to have a mechanic do some hands-on testing! My Bose wave radio (w/cd ) was purchased in 1999, it was working fine untill it quit. Power is gone. What could be the cause and how could i fix it or can it still be fixed? i don't think you're going to be able to fix it. can you drive the car? have it towed to a shop and get some help--you have a serious problem or several problems. see owners manual.