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  #1  
Old 02-06-2005, 10:04 PM
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knocking noise and vibration (please help...it's getting worse)

my car makes a rapid knocking noise accompanied by a fairly rough vibration. the noise comes from the rear of the car. it does it about 60% of the time, and only while i'm moving. it sounds as if something is loose somewhere. anyone know what this could be?

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Old 02-06-2005, 11:04 PM
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Check your rear axles for torn boots. If there are any, it is almost for sure that the CV inside is bad. If boots are all ok, then it will be a bit harder to tell for sure, but very likely one or more has gone bad. Lots of posts about what to do about replacement, just search for 'CV joints' or 'half shafts'.
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Old 02-07-2005, 10:22 AM
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Check out your axles. Both sides and both boots and check them for tears. Also take a good hard look at your flex disks. One up by the transmission and one by the differential.
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Old 02-07-2005, 11:13 AM
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Eyeball the driveshaft support bearing also. A relative had theirs go bad, and the description sounds similar.
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Old 02-08-2005, 02:13 AM
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If it sounds like its coming from one side don't rule out the parking brake, if not adjusted right or not used often, a chunk of rusty cast iron can bind on a shoe and make a hell of a racket. Usually after its been driven a while and warm. If it does it all the time look at the axle shafts as others have said.

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Old 02-08-2005, 09:38 PM
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well, i just finished checking the cv boots...everything looks good there.

i wasn't going to mention this because at first i thought that it wasn't related to this problem, but now i'm not so sure...while the car is moving, i can feel a rythmic bouncing up and down. it doesn't seem to get faster as i pick up speed. is this related to my original problem?
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Old 02-08-2005, 11:50 PM
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bouncing up and down-clunking

Probably time to get this car up on a hoist and start checking things out. Its not going to fix itself and since symptoms are changing could be the damage is increasing since original clunking or whatever. Certainly cheaper to diagnose or have diagnosed before car leaves you stranded and perhaps in hands of total strangers to get it back on the road. You could jack up one rear wheel at a time and see if it moves by grasping top and bottom. Pushing the top and pulling the bottom of wheel and reversing the procedure. In fact just grab the top of each tire and push and pull hard with car sitting on ground should suffice. Just compare to other side as both should have equal play if any. (possible rear bearing failure) If car passes that next proceed to compare cv joints on one side with the other by turning tires back and forth. check for abnormal clunks, play, etc again it is by comparison of one side to another that counts. Also grab 1/2 shaft and push up and down aggressively again comparing one side with other. Above tests may reveal nothing but there is also a chance they will. Plus as an added bonus you might repair it for less than the towing charge if it goes down on the road. Make sure it is also not just a loose wheel check your wheel bolts. While you have car securly jacked and blocked up or on hoist it is quite easy to check your centre driveshaft bearing carrier and rubber universal disks and make sure everything in the back end is bolted down. Examine your rubber bushings that support rear suspension to see if they have wore out as well. In otherwords have a good look around. Since people on this site can not actually hear the problem firsthand and have no knowledge of your experience level i assume you have checked that all the rubber muffler hangers are in place. But the up and down gyrations are raising a little concern in my mind and especially as they do not appear to change with speed. (lets out tire problems like broken belts etc).

Last edited by barry123400; 02-09-2005 at 12:07 AM.
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Old 02-14-2005, 08:52 PM
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the belts were broken and flopping around inside the tires, and also the tires weren't round. i had new tires put on it, which definitely fixed the problem.

thanks
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Old 02-14-2005, 09:00 PM
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i had new tires put on it, which definitely fixed the problem.

this may have saved your life, too. count the roll-overs that have happened due to defective/failing tires.

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