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Roaring noise...what is it???

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Old Oct 29, 2012 | 01:19 PM
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Roaring noise...what is it???

I have a 2000 X 5.4... There is a loud roaring noise when releasing gas pedal or stopped (doesn't matter whether its in park or drive)...noise stops when giving gas...the noise is almost like a bull horn...there are no engine lights on so can't get a code...
 
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Old Oct 29, 2012 | 09:13 PM
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Obstruction in the air plenum?
 
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Old Oct 29, 2012 | 11:29 PM
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Could just be the engine fan engaging. It sounds like an F18 w/ afterburners when the fan clutch engages. <!-- / message -->
 
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Old Oct 30, 2012 | 12:41 AM
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That's what I was thinking, they spin pretty good when they are cold and idling and some probably grab better that others.
 
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Old Oct 30, 2012 | 02:30 AM
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Probably not the fan as it will get louder with the gas.

I'd, too, suspect an airway obstruction or more than likely, an air/vacuum leak.

Check your intake assembly first. Pop the hood and listen for the noise and try to pinpoint its location.
 
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Old Oct 30, 2012 | 08:29 AM
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My 250 work truck does this sometimes. Everytime our mechanics checked it out it ended up being the IAC.
 
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Old Oct 30, 2012 | 09:04 AM
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Got one of these in the back seat?

 
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Old Oct 30, 2012 | 09:40 AM
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Originally Posted by BigPigDaddy
Got one of these in the back seat?

 
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Old Oct 30, 2012 | 10:44 AM
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Stick a broom in the fan to eliminate that possibility. It is starting to sound more like an intake noise though.
 
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