My '92 190e 2.6 has developed low pitched... whrt....whrt...whrt...
like a warped rotor sound, that speeds up and slows down with the car
speed. No pedal pulsation, or brake shuder. It is most noticeable
when slowing for a light, or stop sign, or on smooth asphalt at 60mph
with foot of the gas coasting. The noise seems to be coming from the
transmission, left rear end area. The noise seems to have started
after having center, and rear mufflers, and pipes replaced. Recently
had differential fluid, and trans fluid, and filter changed, just to be
sure. Could this be transmission problem? After fluid
change, kickdown has gone from slightly pressing pedal, to having to
stomp on it, to engage lower gear, with more than normal engine braking
when removing foot from accelerator...??? thanks in advance..Rick
just asking...because if noise altered while taking turns, I'd check rear
wheel bearings as well...
mine did the "wrt wrt wrt" just out of no where...from one day to the other
usually only one goes bad...Juergen has more info on that
just another though,
The noise does not change when turning, just slows down. The sound
seems to get louder, the longer I drive the car at highway speeds.
I thought, maybe a dragging emergency(hand brake) shoe, but no dash
lights are lit. The exhaust work was done by independent MB shop
Is it possible some part is laying on, or touching the drive shaft?
Sounds like a wobbling tire or dragging brake shoe (pad) I have no idea
what a bad wheel bearing would sound like. Shop said mechanic spun
the wheels and they sounded o.k why would it get louder as it gets
also check tires for obstacles in thread, unevenwear...lumbs etc.
with a pad draging, the dash light wouldn't necessarily be lit, as long as
the lever is not pushed/pulled
there might even be a loose or broken retaining spring, not pulling the pads
to its rest correctly
a draging pad would eventuelly wear in and the noise would disappear, but
since we don't want that...u have to keep looking
i doubt something laying actually ON the drivetrain...
take it back to this shop an have them check, I found a wrench once in my
engine compartment, which someone from a local shop had left, while they
were doing oil.
these things happen
well, depending on what is making the noise, it can surely be directly
associated with speed, rev, temperature...anything possible
i can think of:
tires (worn/bad/obsticle in thread)
exhaust touching something
loose exhaust temp shield
a worn/broken parking brake cable
a loose break or fuel line touching the body
fuel pump disattached (worn rubber mounts)
junk in the trunk....
i could go an ;O)
good luck finding it!
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.