what's this sound driving me crazy.
#4
Senior Member
To me... It sounds like a bad pulley or a bad catalytic converter. Either way, it's worth some investigating.
#7
MBWorld Fanatic!
Could be either of those things. Sounds like a pulley noise, but could be a chirp of metal ehasust components rubbing together. Get a mechanics stethoscope (they're cheap) and touch it on each accessory with a pulley while the engine is running (very carefully). That's how I figured out my alternator bearings were making noise.