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Old 12-05-2009, 12:23 PM   #1
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Odd noise at idle and after engine shut off...

ok guys this one stumps me...I have a very high pitched noise coming from the engine bay at idle and when the engine is cut off..when I cut it off you can hear it directly from the engine bay then after a minute or so it fades away...I can not for the life of me think what it is..can anyone help?
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Old 12-05-2009, 12:27 PM   #2
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Does it sound like its coming from an idler or tensioner pulley? Does it go away when you rev the engine?
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Old 12-05-2009, 12:30 PM   #3
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It could be a high pressure leak that is whistling. When you shut off the engine, the pressure has to leak down and whistle away until equalized.....which then would make it stop.

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Old 12-05-2009, 01:48 PM   #4
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where could the high pressure be coming from? im at a loss..I know its not a pulley or anything because it doesnt speed up or go away when uping the RPMs
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Old 12-05-2009, 03:34 PM   #5
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Most pulley or belt noises wont go away with rpm increase. Some will be louder while others might make a different pitch. Im not sure what kind of high pressure would encounter. Might be a vacuum leak.
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Old 12-05-2009, 03:42 PM   #6
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hmm ima have to take a closer looks see if any vacuum lines are loose only reason i dont think its a belt or pulley is because it keeps going after the engine is cut-off. thats why pressure release sounds more like it..
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Old 12-05-2009, 04:58 PM   #7
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is your a/c on. try turning off that system to isolate your problem.
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Old 12-05-2009, 11:27 PM   #8
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a/c hasnt been on for awhile mainly heat
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Old 12-06-2009, 01:46 PM   #9
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Cooling fan?
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