Question about Ford Expedition
There are several points this could originate.
Bad tires will normally cause a distinct vibration of the steering that can change in intensity dependent on speed.
Bad shocks are less likely to cause a hum of any kind and if 'blown' will produce hard knocks when hitting larger bumps. You can crudely check shocks by 'bouncing' each corner and watching how it recovers; if you let go at the low point, the shock should rise slightly above level and return one time only, not dampen out with decreasing movement.
I would be checking the engine/transmission motor mounts for signs of torn or cracked rubber or cracked metal. There are normally three mounts; two on the engine and a third on the transmission housing. If one of these has failed, it can transmit engine noise to the body of the vehicle producing a hum.
Posted on Nov 15, 2010
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Posted on Jan 02, 2017
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