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Unread 10-11-2010, 11:17 PM   #1
dedYJ
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2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Sparks, Nevada
Posts: 121
Where is the whine?

My 95 YJ developed a whine. It sounds like it is coming from the front of the engine. Everything that is run by the serpentine belt has been replaced and the timing gears, chain and tensioner have been replaced. New water pump too. The whine starts after the engine has run for a while, the engine has to be warm. The whine is more pronounced at a steady engine speed, it decreases when accelerating and increases when decelerating. This seems to get louder with lower outside temperatures. It makes no difference if the clutch is engaged or disengaged, air conditioning on or off, turning the steering wheel makes no difference. The whine does go away after 5-10 minutes of driving after it starts.

Any ideas are appreciated.
Thank you!

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Unread 10-12-2010, 01:50 PM   #2
Remops
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1989 YJ Wrangler 
 
Join Date: Oct 2009
Location: Denver, Colorado
Posts: 58
Quote:
Originally Posted by dedYJ View Post
My 95 YJ developed a whine. It sounds like it is coming from the front of the engine. Everything that is run by the serpentine belt has been replaced and the timing gears, chain and tensioner have been replaced. New water pump too. The whine starts after the engine has run for a while, the engine has to be warm. The whine is more pronounced at a steady engine speed, it decreases when accelerating and increases when decelerating. This seems to get louder with lower outside temperatures. It makes no difference if the clutch is engaged or disengaged, air conditioning on or off, turning the steering wheel makes no difference. The whine does go away after 5-10 minutes of driving after it starts.

Any ideas are appreciated.
Thank you!
A shot in the dark but I had a weird whine that turned into a rattle after long enough of not being able to identify it. It ended up being the Fan clutch. Whined when it was cold like yours, until it heated up. Eventually the internal bearing were shot, and I replaced it. Easy fix. Good luck.
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Unread 10-12-2010, 04:41 PM   #3
dedYJ
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2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Sparks, Nevada
Posts: 121
New fan clutch already installed. It has been doing this for 6 months with no signs of changing.
Thanks
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Unread 10-13-2010, 05:28 AM   #4
Mugzz819
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1990 YJ Wrangler 
 
Join Date: Jun 2009
Location: Philadelphia
Posts: 197
Another shot in the dark but did you check all your ujoints? Mine made some pretty funky noises and sent me on a bit of a wild goose chase with noise til I realized the rear ujoint was bad...
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Unread 10-13-2010, 06:32 AM   #5
MJMPC
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1991 YJ Wrangler 
 
Join Date: Nov 2008
Location: Elizabethtown, Ky.
Posts: 3,070
Have you checked your vacuum lines for a leak?
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Unread 10-13-2010, 09:15 AM   #6
raggededge1
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1993 YJ Wrangler 
 
Join Date: Aug 2010
Location: Cherry Valley, Ca.
Posts: 10
I have the same problem but after crawling around on the underside I have come to the conclusion it is the fuel pump (in the tank) It only does it sporatically usually after it has run awhile.
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Unread 10-13-2010, 10:08 AM   #7
dedYJ
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2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Sparks, Nevada
Posts: 121
The Jeep will do this at idle or while driving. I have read that an oil pump can whine, but I have no loss of pressure and it is not a constant. I will look at the vacuum lines a little closer.
Thanks
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Unread 10-13-2010, 11:09 AM   #8
shaggyjim
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1992 YJ Wrangler 
 
Join Date: Nov 2008
Location: Grand Junction, Colorado
Posts: 974
If you want, pull your belt off and start it and drive it a bit but dont let it over heat. If it gose away then you got a pully going out in the front. It just sounds like the belt is still slipping...
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Unread 10-13-2010, 01:48 PM   #9
SpideYJeep
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1992 YJ Wrangler 
 
Join Date: Jan 2010
Location: El Lay, TRIP!
Posts: 428
Quote:
Originally Posted by shaggyjim View Post
If you want, pull your belt off and start it and drive it a bit but dont let it over heat. If it gose away then you got a pully going out in the front. It just sounds like the belt is still slipping...
If it isn't the belt slipping, +1 on the pulley.
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Wrenching isn't the problem, it's the brains attached to the hands...unfortunately, I'm lacking some of the former so that's why I'm asking you guys!!

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My YJ is so excited it's leaking oil!
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Unread 10-13-2010, 09:45 PM   #10
95greenrio
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1995 YJ Wrangler 
 
Join Date: Jul 2007
Location: Virginia
Posts: 345
Sounds like what mine was doing last winter, the intake manifold gasket was shot. It did exactly what you are describing. Try spraying some WD-40 or carb cleaner or something similar around the mounting surface while it's whining and listen for any change in the engine noise.
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Unread 01-19-2012, 12:49 PM   #11
dedYJ
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2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Sparks, Nevada
Posts: 121
I wanted to update. It was a loose bolt in the intake manifold!
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