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Jeep Wrangler, 2.5L with high pitched

Tiny
JEEPTJ1999
  • MEMBER
  • 1999 JEEP WRANGLER TJ
  • 11,000 MILES
Hello,

I have a high pitched whistle noise coming from my 1999 2.5L Jeep wrangler. Noise is heard mostly at idle.

The noise GOES AWAY when I take off the fan belt, so m not a vacuum leak. I have now replaced ALL of the components attached to the belt (alternator, water pump, pulleys, power steering, fan clutch) and the noise still persist. Its really driving me nuts that I can't figure out what it is. I would like any help.

Also, due to the colder weather coming in, i have noticed that the pitch of the tone increase when I put on the heater in the Jeep. I'm not sure if its connected to the heater or just because turning the heater on increases the RPMs slightly.

Could it be electrical? Here is a video, all suggestions are appreated; http://www.youtube.com/watch?v=BiG9syxz6. . .

THANKS!!!
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Monday, October 15th, 2012 AT 4:38 PM

10 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It cold be the fan sucking air in through teh radiator. Also did you replace the belt tensioner and the belt? If you can shoot water on the belt and the noise goes away then the belt needs replacing as well as tensioner.
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Monday, October 15th, 2012 AT 4:43 PM
Tiny
JEEPTJ1999
  • MEMBER
  • 4 POSTS
Yeah, i've replaced both the tensioner pulley and belt. Sound remains. As for the fan sucking air in through the radiator, i've taken the fan off and ran the engine and it still remains. This noise is so hard to find, i'm really out of ideas.
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Monday, October 15th, 2012 AT 4:47 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It might be a vacuum coming through throttle body or a line off someplace, normally those make teh whilstling sounds. You might look and see if anything is rubbing as well, like a small piece of metal, like sheetmetal. I'd have to hear it live and can't hear. The youtube sited didn't work. But it wold be to hard to nail down in here anyhow.
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Monday, October 15th, 2012 AT 4:49 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Check the harmonic balancer as well. Note if the crank pulley is moving in a wavy manner.
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+1
Monday, October 15th, 2012 AT 4:53 PM
Tiny
JEEPTJ1999
  • MEMBER
  • 4 POSTS
Thanks for the replys! If it were a vacuum leak in my throttle body, or anywhere else. Wouldn't the sound persist even when I take the belt off? Please remember, when I take the belt off, the sound goes away and i've already replaced everything attached to the belt.

Thanks!
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Monday, October 15th, 2012 AT 5:02 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Ya it probably would but I really can't think of anything else to tell you either.
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Monday, October 15th, 2012 AT 5:04 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Have you checked the crank pulley?
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Monday, October 15th, 2012 AT 6:39 PM
Tiny
JEEPTJ1999
  • MEMBER
  • 4 POSTS
The crank pulley is original. It has no cracks on it as well as no play in it. Makes no noise when the belt is removed and engine is started. Do you think this could cause noise under the stress of the belt?
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Monday, October 15th, 2012 AT 7:18 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It mighit if it were loose or broken. You might put a chalk mark accross it, like staright accross, then give it ia quick rev and see if the lines match up. If not then the rubber is broken and needs replacing.
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Monday, October 15th, 2012 AT 7:21 PM
Tiny
DRDETAIL66
  • MEMBER
  • 2 POSTS
My 2.5 had a high pitched whistling noise and the exhaust header bolts had worked loose and I tightened them and solved that irritating noise. May help you.
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Saturday, May 4th, 2013 AT 8:20 AM

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