I have a 93 Toyota Corolla DX, Auto transmission, 202,000 miles.
There appears to be a humming noise coming from the front end. It sounds like a low frequency helicopter blade spinning about - like a 'whomp whomp whomp" sound. If you listen closely, it occurs at all speeds. It seems to be directly related to the sound of normal braking, and you can feel it ever so slightly in the steering wheel.
The frequency of the sound increases with road speed, and becomes most pronounced at 40 - 45 mph...
What I've done to trouble shoot:
1) A slide pin on the driver's side brake caliper was frozen. Caused brake pad rubbing - replaced pin and relubed the pins. Thought for sure that was it - however it wasn't.2) Replaced driver side wheel bearing - as that wheel didn't spin very well. Didn't change the noise (but wheel turns well.) Passenger side bearing appears to be fine.
3) Rotated tires. No change.I'm running out of ideas. The CV joins all look ok - no breakage and no clicking during turns.
I've only recently obtained this car so I don't know its history - I don't know if the sound is normal road noise, is typical of the tire (Michelin) manufacturer, or perhaps a binding caliper...
Any suggestions are greatly appreciated!
TIA
Tom