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Unread 09-22-2006, 09:42 AM   #1
woodb
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Join Date: Jul 2006
Location: St. Louis
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Whirring Noise

Hey all,

I have this whirring noise that sounds like it is coming from the engine which increases as rpms increase. It is not noticable before 2000rpms, but as the rpms climb higher the noise gets louder. It almost sounds like a belt, but I am not sure. (actually, it almost sounds like an AC fan - but the ac is not on)

Is this normal? My jeep is somewhat brand new.

With the top down, I can't hear it - but now that it got cold out and the top is back on more, it is annoying as can be. My ride sounds like a jet taking off.

Thanks in advance for any help (I am worried it might be the transmission)

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Unread 09-22-2006, 10:18 AM   #2
Crashnburn80
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2004 TJ Wrangler 
 
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Location: Kirkland, WA
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My tranny makes a small but noticable wirring noise on the highway, the Goodyear MTRs drown most of it out. If your talking about the same thing Im pretty sure its normal, but if yours is really loud then Im not sure.

Edit: It would help to know what engine/tranny you are running. I have a 4.0L 5spd.
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Unread 09-22-2006, 10:47 AM   #3
ASUsax
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2002 TJ Wrangler 
 
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Location: AZ
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Agreed, we need tranny info. Could be clutch noise. Mine rattles when it's not in gear.
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Unread 09-22-2006, 02:47 PM   #4
woodb
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I have a 6speed 4.0.

It doesn't make the noise out of gear, only when the rpms are above 2000 in gear (in any gear). It is quite loud, the same sound I'd imagine I would hear if a belt was cracked or worn..
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Unread 09-22-2006, 03:09 PM   #5
Mowmer
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2004 TJ Wrangler 
 
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Location: Forest Grove, OR
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It maybe a bearing in one of the pulley's that your belt goes around. Had a very loud whinning on my girlfriends car. Then it stopped but so did the power steering, dashboard, waterpump and radiator fan(belt broke when bearing finally seized).
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Unread 09-22-2006, 03:19 PM   #6
Jay Lu
2006 TJ X bone stock
2014 WK 
 
Join Date: Oct 2003
Location: Rockville, MD
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Does it make the noise when you stop the Jeep, press in the clutch, and rev the engine to 2000 RPM? I may have the same problem so I am really interested. My Jeep is 2006 TJ X 4.0L 6 speed.
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Unread 09-22-2006, 08:14 PM   #7
woodb
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I have to go run some errands early tomorrow morning, so I will try it out then and let you know. I'd be willing to bet you a beer that the same sound will be show up
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Unread 09-22-2006, 08:27 PM   #8
McLovin
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I had the same problem. It ended up being bad bearings in two of the pulley's.
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Unread 09-22-2006, 11:32 PM   #9
Jay Lu
2006 TJ X bone stock
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Which two?
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Unread 09-23-2006, 12:52 PM   #10
woodb
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yep, happens when I rev with the clutch in... I'd also be curious as to which bearning needed to be replaced.

Jay, I have a X as well, perhaps we rolled of the assembly line near each other and got a bad batch of something
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Unread 09-23-2006, 12:57 PM   #11
McLovin
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It was both th eidle pullies for me.
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Unread 09-24-2006, 10:26 PM   #12
Jay Lu
2006 TJ X bone stock
2014 WK 
 
Join Date: Oct 2003
Location: Rockville, MD
Posts: 44
I took off and checked those two pullies but they looked fine. I also checked the starter and it's OK. If the pullies are making the noise, it should be most noticable from the engine bay, but in my case the noise is most noticeable from the cab when all windows are closed.

I guess my case is still in its early stage. If you can convince the dealer something is definitely wrong, they should take care of it under warranty.
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