SOURCE: Noise when accelerating and decelerating
this might be caused by a bad u-joint on your driveshaft.
SOURCE: 2002 Alero wont go over 40 mph
I happen to own a 2002 alero, and my wife called me and said the same problem had happened. Change your fuel filter.
SOURCE: makes a humming sound between 30 and 40 mph
I suspect that one of your wheel bearing have worn out. SO to confirm please lift up one by one all the wheel and rotate. listen to any hum which corresponds to your noise. hold the wheel on either sides and check for any shake even a small one. if you detect a hum check the wheel bearings and the HUB, most cars have this assembly making the noise specially when the grease becomes dry or there had been water logging specially salty.If so change the bearings / hubs, when changing look out for any damage to the axle. I hope you get this right. Helpful? Good day.
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