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rumble001
New User
Nov 21, 2010, 11:18 AM
Post #1 of 2
(1609 views)
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loud humming/buzzing
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my 99 mercury cougar 2.5L is making a loud humming/buzzing sound from under the hood, its manual trans. and when stopped is idleing around 2000rpm but then sometimes drops down to almost 200rpm and feels like its strugling to stay alive, sound is also while driving too, any ideas on what this could be?
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Sidom
Veteran
/ Moderator
Nov 21, 2010, 3:25 PM
Post #2 of 2
(1601 views)
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Re: loud humming/buzzing
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You may want to check your IAC motor.... I know the older ones would split a diaphram inside causine a noise & erratic idle... I forgot the exact style this one uses but check it out anyway....
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