The buzzing sound is a front wheel bearing. With this bolt-on design, it is impossible to be certain which side is respnsible for the noise. Your mechanic will run it in gear on a hoist, then listen to each one with a stethoscope.
Failure to idle by itself will occur if the battery was recently disconnected or run dead. The engine computer must relearn minimum throttle so it knows when it must be in charge of idle speed. You do this by driving at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals.
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Saturday, January 23rd, 2010 AT 12:31 PM