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Whistle

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Old Apr 17, 2010 | 12:52 PM
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Loganfwx
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From: Greeley, CO
Year: 1999
Model: Cherokee
Engine: 4.0 Straight 6 HO
Default Whistle
So I've got a whistle kinda hum noise that starts at almost exactly 40 MPH. Only when I'm accelerating or applying throttle. Throttle body or something?
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Old Apr 17, 2010 | 12:56 PM
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Madman
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From: Oak Hills
Year: 1996
Model: Cherokee
Engine: 4.0 I6 K&N, Flowmaster, accel yellow, 703 injectors, SS fuel lines routed through CAI
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Vacuum leak?

Check your hoses and their wear
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Old Apr 17, 2010 | 01:25 PM
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93gc40
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From: Visalia, Kalifornia, ussa
Year: 1996
Model: Cherokee
Engine: 4.0
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Look for leaks along the intake. Is there a throtle spacer? They whistle sometimes
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Old Apr 17, 2010 | 03:17 PM
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Heinz57Fox
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From: Michigan
Year: 1996
Model: Cherokee
Engine: 4.0
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Check your vacuum tubes I had the same problem with mine and one of the vacuum tubes had come out.
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Old Apr 17, 2010 | 09:56 PM
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Loganfwx
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From: Greeley, CO
Year: 1999
Model: Cherokee
Engine: 4.0 Straight 6 HO
Default
I think my PCV/CCV/whatever goes from the valve cover to the intake isn't quite air tight.
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