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Unread 03-19-2014, 11:42 PM   #1
misfit77
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1996 ZJ 
 
Join Date: Sep 2012
Location: tucson, az
Posts: 642
New Mystery Sound

See if you guys can help.

I just started getting this noise in my 3.5" lifted 96 ZJ with 4.0.
I have removed the PS pump about 4 times and this last time I did not put the snorkel on the air box. No other work has been done in the last month or more.

The sound is like a metallic rattle or a whistling. It starts around 30 mph but gets loudest around 55mph. The frequency does not change with speed. This makes me to think its not a bearing or U-joint. Going to neutral and revving does not change the sound. This causes me to rule out a belt, PS pump or such.
Pressing the brakes does not make the noise change. So probably not the brake pads

The noise is the easiest to hear at the beginning of the video. Sorry about the wind noise.





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Unread 03-20-2014, 10:25 AM   #2
copengrizz01
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1997 ZJ 
 
Join Date: Aug 2013
Location: franklin, indiana
Posts: 89
i had a similar noise while driving and it was the washer thing that goes over the axle nut. id check for loose bolts or anything loose. its prolly something simple
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Unread 03-20-2014, 11:24 AM   #3
PolkaPower
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1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss, Italy
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Sounds like a bad bearing.
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Unread 03-20-2014, 09:10 PM   #4
misfit77
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1996 ZJ 
 
Join Date: Sep 2012
Location: tucson, az
Posts: 642
I was afraid it was the bearing.

I am used to bearings have a low rumble and the rumble goes away when you put a load on the wheel by turning the wheel.
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Unread 03-20-2014, 09:12 PM   #5
PolkaPower
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1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss, Italy
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That's just an internet opinion from a windy video. I don't know what it is. I hope you post it when you find out.
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Unread 03-20-2014, 09:28 PM   #6
misfit77
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1996 ZJ 
 
Join Date: Sep 2012
Location: tucson, az
Posts: 642
I won't be buying a bearing just yet. I have a dam power steering battle for now. Maybe if I'm lucky the squeal will go away.
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Unread 03-20-2014, 10:36 PM   #7
Uniblurb
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1996 ZJ 
 
Join Date: Jan 2012
Location: Central, Ohio
Posts: 3,838
Below is some info on bearing/gear noise. I have a pinion bearing going out and it makes a real high-pitched whine particularly noticeable on the freeways. But yours doesn't quite sound the same and sounds more like something's loose. Maybe try jacking it up and spin the wheels to make sure it's not brake related. Even a loose metal-to-metal ebrake shoe could be making a noise like that. Just a thought and good luck.
gear-bearing-noise-med-size-.-p.3-3.jpg  
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96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 93 4.0 XJ (spare), 96 4.0 XJ (son's)

-Stalling ZJ? 12 things to check before replacing a sensor; the Dirty Dozen
-Crankshaft position sensor multimeter test. & video of testing.
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Unread 03-31-2014, 10:35 PM   #8
misfit77
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1996 ZJ 
 
Join Date: Sep 2012
Location: tucson, az
Posts: 642
Thanks to Uniblurb, I gave it try to diagnose front pinion bearing. Well it wasn't the bearing.
After putting it in 4wd, I got a clunky sound. I had this before but it would easily go always as soon as I put it back in 2wd.
This time it would not stop going clunky clunky. Took a look and my front drive shaft was sloppy.

Took it apart and my centering yoke was worn out and dry.



https://picasaweb.google.com/lh/phot...eat=directlink

I never seen this nor did I know the name of it. After and hour of research I bought a new centering yoke and 3 U-joints.
An hour or two, problem solved.

Thanks guys.
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