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Old 11-27-2012, 02:55 PM   #1
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Vacuum Whistle ?

Just bought a 2000 TJ 4.0 5 speed for my son.First road trip today I drove it to town for tires. Notice what sounds like a vacuum leak whistle. Does not do it while idling only after its been up to speed and will slowly die down when you come to a stop. Im assuming as it builds vacuum it starts to whistle and stops as vacuum drops off when coming to a stop. Any known problem places to start looking ?

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Old 11-27-2012, 02:58 PM   #2
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Is is likely the intake/exhaust manifold gasket. i have the same issue when it get cold outside. There are threads on it. Do a search here and jeepforum.com for whistle and tea kettle.

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Old 11-27-2012, 07:37 PM   #3
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Thanks for the tip I will check with a can of ether tomorrow.
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Old 11-28-2012, 03:46 PM   #4
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Does the Jeep have an aftermarket cold air intake or a throttle body spacer?
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Old 11-28-2012, 04:17 PM   #5
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No its all stock.Any place in particular to look on intake manifold ? He just came home and said it did it this morning when it was cold but not so much this evening.
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Old 11-29-2012, 12:53 PM   #7
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Before you go for intake manifold, make sure one of your vacuum lines isn't cracked or doesn't have a hole in it. They can easily make this noise as well

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