Strange Fan-like noise while driving - JeepForum.com

 
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post #1 of 4 Old 02-06-2014, 02:02 PM Thread Starter
jaspercomp
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2004 TJ Wrangler 
 
Join Date: Feb 2014
Location: pasadena
Posts: 1
Strange Fan-like noise while driving

Hello All,

I have a 2004 Jeep Rubicon, 4.0. I have this really strange noise that only happens when I'm driving down the road. It sounds almost like a fan hitting something or something is being hit - not a heavy knocking sound or anything like that. The noise only happens when I'm driving, not at idle, or when I race the engine, engage/disengage the clutch, it's not the heater/ac fan - what else is rotating only while moving?? oh and it's not the brakes, tried to find a correlation between that too, but no luck. Thanks in advance for any advice/suggestions! ps: it could also be described as a fast "clicking sound" but again, it stops when the jeep stops.

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post #2 of 4 Old 02-06-2014, 07:07 PM
mukluk
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2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Clyde
Posts: 2,040
What rotates only when the Jeep is moving? The driveshafts and axles. You can try driving the Jeep with only the front or rear driveshaft installed to narrow down where the ticking is coming from.

2000 TJ SE
2005 LJ Rubicon
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post #3 of 4 Old 02-06-2014, 09:18 PM
JPNinPA
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2005 LJ Wrangler 
 
Join Date: Feb 2011
Location: Dayton
Posts: 2,330
^^2x or crawl under and look for slop in the u joints by rocking the shafts or axels back and forth. There should be no slop at the u joint.

"Never look down on anyone unless your helping them up"- Jesse Jackson
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post #4 of 4 Old 02-07-2014, 05:38 AM
Jwolfer
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2006 TJ Wrangler 
 
Join Date: Apr 2012
Location: Del Rio
Posts: 613
One of your U joints is bad in the front drive shaft. I had the same issue. It could be something else but I'd start there.
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