Where is the whine? - JeepForum.com
 
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post #1 of 11 Old 10-11-2010, 11:17 PM Thread Starter
dedYJ
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2000 TJ Wrangler 
 
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Location: Sparks
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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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post #2 of 11 Old 10-12-2010, 01:50 PM
Remops
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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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post #3 of 11 Old 10-12-2010, 04:41 PM Thread Starter
dedYJ
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New fan clutch already installed. It has been doing this for 6 months with no signs of changing.
Thanks
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post #4 of 11 Old 10-13-2010, 05:28 AM
Mugzz819
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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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post #5 of 11 Old 10-13-2010, 06:32 AM
MJMPC
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Have you checked your vacuum lines for a leak?

MIKE

http://www.dav.org/

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Elizabethtown Ky.

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post #6 of 11 Old 10-13-2010, 09:15 AM
raggededge1
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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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post #7 of 11 Old 10-13-2010, 10:08 AM Thread Starter
dedYJ
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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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post #8 of 11 Old 10-13-2010, 11:09 AM
shaggyjim
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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...

Jim...

"That's more fun than watching a hippie get mauled by a bear!"
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post #9 of 11 Old 10-13-2010, 01:48 PM
SpideYJeep
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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.

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!!

Quote:
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My YJ is so excited it's leaking oil!
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post #10 of 11 Old 10-13-2010, 09:45 PM
95greenrio
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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.

1995 YJ Rio Grand - work in progress
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post #11 of 11 Old 01-19-2012, 12:49 PM Thread Starter
dedYJ
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I wanted to update. It was a loose bolt in the intake manifold!
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