Question about 1984 Porsche 928

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Humming or roaring noise

The faster you drive the loader it gets,has new wheel bearings,tires are ok.I think it could be the drive shaft or differencial.

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On my car, it was a stuck brake caliper.

Posted on Sep 14, 2010

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What would cause a constent humming noise in front end I was told it sounds like the tire is gonna come off, someone else said its the tires i have on it


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THIS NOISE IS CAUSED BY A POSSIBLE WHEEL BEARING
WHEN YOU DRIVE THE VEHICLE YOU SHOULD HEAR A ROARING NOISE AND AS YOU GO FASTER THE NOISE WILL GET LOUDER AND WHEN YOU TURN THE WHEEL FROM SIDE TO SIDE THE NOISE WILL FADE IN AND OUT. THIS IS AN INDICATION THAT THE WHEEL BEARING IS BAD.
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Sounds like a bad wheel bearing to me. Try slightly turning to the left than to the right when the noise begins. If it changes pitch, than it is most probably a bad wheel bearing.

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My car makes a bad growling noise. Everyone said that it was a front wheel bearing because that tire was worn down really bad on the outside. I replaced the passenger front wheel bearing, and it is still...


WHEEL BEARING USUALLY STARTS MAKING A ROARING TYPE NOISE WHICH USUALLY GETS LOUDER THE FASTER YOU DRIVE, SOMETIMES THEY WILL BE LOOSE , TO CHECK JACK UP THAT WHEEL AND GRAB TOP AND BOTTOM OF TIRE AND SHAKE, IF THERE IS MOVEMENT, TRY TO GET SOMEONE TO ROCK TIRE FOR YPU AND WATCH WHERE AXLE GOES INTO CENTER OF BEARING AND SEE IF AXLE IS MOVING WITH TIRE MOVEMENT AND SPINDLE REMAINS STATIONARY, THEN IT IS BAD BEARING, OR SOMETIMES THERE WILL BE NO MOVEMENT, THEN BLOCK REAR WHEELS AND RUN CAR WITH THAT WHEEL IN AIR AND SEE IF YOU HEAR NOISE, GOOD LUCK.

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Unbearable humming vibration in rear of car


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Tires are making a roaring noise while driving


Either the tires have slippe belts in them, mainly old or worn tires. Or more common is one of your wheel bearings is going bad. Could also be an axle shaft. Jack up the front of the vehicle and grab the wheel and see if you can move it up/down or side to side. see if there is excess play to check wheel bearing issues

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1 Answer

Front End Problems


first i would check the tires , are they cupped or chopped on the tread? run your hand over the tread and see if it feels rough and uneven. take the truck to a auto repair shop and have them jack both front and rear axles off the ground, put the truck in 2 wheel drive and run the speedometer to the speed you usually hear the roaring noise, if you don't hear the noise , put the truck in 4 wheel drive, turn off the traction assist if it has one and run it to the speed you would hear the noise. if you hear the roaring noise with tires off the ground, the problem is in the drivetrain, (engine, transmission, transfer case, u-joints, differentials or the front left or right cv halfshafts or u-joints). the older models (97 98) had the front two driveshafts from the differential turning all the time, they engaged in 4 wheel drive from the transfer case and a solenoid on the front differential. depending on the miles you have on this truck, the most likely areas i would look at would be the tires, u-joints/cv joints, and front and rear wheel bearings. thanks and good luck.

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