1999 TJ Horrible Metal Grinding/Rattle Noise - Video w/ Sound - Jeep Wrangler Forum
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Old 03-16-2012, 03:23 PM   #1
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1999 TJ Horrible Metal Grinding/Rattle Noise - Video w/ Sound

Hi All,

Can anyone tell me what they think this horrible noise is on my TJ? I have no idea where it's coming from or what to check. It does not make any noise when idling and standing still (probably not the cat since it doesn't make noise when not moving). Any ideas or suggestions GREATLY APPRECIATED!


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Old 03-16-2012, 03:27 PM   #2
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I would guess exhaust. Your cat might be rattling agaist the skid plate, or your muffler has a broken weld.

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Old 03-16-2012, 03:29 PM   #3
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I'm on the road right now so I couldn't hear the video really well. Have you checked all of your U joints? They can make some really crazy noises when they start to go bad.
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Old 03-16-2012, 03:31 PM   #4
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Originally Posted by Dextreme View Post
I would guess exhaust. Your cat might it rattling agaist the skid plate, or your muffler has a broken weld.
If that were true, wouldn't it make noise when reving while sitting still? When sitting still, I can redline it and it doesn't make that noise. The noise is (IMO) definitely caused by the Jeep moving.
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Old 03-16-2012, 03:35 PM   #5
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If that were true, wouldn't it make noise when reving while sitting still? When sitting still, I can redline it and it doesn't make that noise. The noise is (IMO) definitely caused by the Jeep moving.
Well, when my muffler weld broke it would only rattle when the engine was under load. When the jeep was moving, the muffler was sliding back and forth at the clamp banging on the broken weld near the 02 sensor. Tough to describe...just check your exhaust and hangers.
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Old 03-16-2012, 03:36 PM   #6
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Sounds like thin metal, if not the exhaust somewhere maybe see if your disc brake dust shield is intact and not rattling against the rotor.
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Old 03-16-2012, 04:53 PM   #7
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There is a piece of metal above the cat that acts as a heat shield. It's common for them to break a spot weld or two and flap....making a sound like you have check it out by grabbing the heat shield and see if it's loose. You probably should let it cool first :-).
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Old 03-16-2012, 06:16 PM   #8
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Thanks for all the replies. I'm going to pull the front passenger wheel tomorrow and check the dust shield. I'll also look at the heat shield. I did have to fix the muffler bracket in the back that secures the muffler to the frame. That was more of a clang/ping noise and real easy to figure out. I had a friend listen and he immediately thought dust shield on front passenger wheel hub assembly. I'll report back tomorrow and post any relevant pics. Thanks for the replays thus far.
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Old 03-17-2012, 01:17 AM   #9
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I don't want to scare you bc this sucks (I've been through it) but my jeep made a clunk noise one day shifting from reverse to first and it turned out my rear diff gears chewed themselves up. It drove after that and clunked horribly (only when moving). Ended up having basically to replace my rear end. If its a grinding noise def get checked out soon as possible
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Old 03-17-2012, 06:21 AM   #10
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Check out your Sway bar link bushings.
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Old 03-17-2012, 01:01 PM   #11
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Hi guys. After further inspection it appears to be a bad passenger side axle u-joint. Pulled the wheel and the u-joint is all rusted and has visible play. I'm guessing that the metal rattling is the sound of the u-joint moving inside of the yoke. Does that sound right to you guys? I didn't think it would make that much noise but I can't find anything else to attribute the noise to. Thanks for all the replys. I'm hoping I can tackle this repair myself tomorrow as I need the jeep for work Monday. Thanks everyone!
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Old 12-17-2012, 05:48 PM   #12
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I know this is a old post but did you ever find out what was causing the noise? I have a very similar noise coming from my jeep and have yet to figure out the cause

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