Going home, I noticed a slight humming at most speeds (barely audible). Figured it was the tires that were in need of changing.
Previous owner stated car was gone over with a fine tooth comb and replaced everything that was hinting of being bad.
Removed a wheel for closer inspection after arriving home because I suspected bad wheel bearings, and saw no problems. No looseness in the axle - lateral or vertical. Everything is tight. 1/2 shaft boots look new with no damage. Axle retention nuts look new. As if the axles have been recently replaced.
Fluids are correct, and at proper levels.
Took a vacation road trip to FL, and as soon as we passed 40MPH, it sounded like permanent rumble strips were under the car! But it was only evident thru the construction zones - thats why im baffled. Between 40 and 60MPH we couldnt hold a conversation. After 60MPH its quiet as night!
This is an AWD vehicle - is there a torque converter or something else I can look into to resolve this?
The tires are brand new all season performance and balanced. We recently had snow, and the noise was still evident on ice/snow covered roads.
I did notice a slight lull when I went over railroad tracks @ 50 kind of BUMP JUMP. The noise lowered, but when the weight of the vehicle transferred back to the wheels, so did the sound.
The noise is constant during accelleration, coasting or braking - and stays constant even with the engine rpm fluctuation. (Put it in N going 50, and revved engine. No change in sound.
Any insight?
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Tuesday, February 3rd, 2009 AT 2:48 PM
