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strange interferrence sound comming from engine

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Old Dec 18, 2010 | 07:36 PM
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Exclamation strange interferrence sound comming from engine

i have a 2004 f150 4.6 v8 with 95000mi on it. lately almost everytime i get between the speed ranges from 50 to 60mph, i start hearing a weird sound, almost like radio interferrence and very annoying, yet even when i turn the radio off, it still goes. the only way to make it stop is by letting off the gas. if i keep my foot on the gas, and keep it steady or accerlerate it still goes. what in the world could it be, and how do i stop it
 
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Old Dec 18, 2010 | 10:33 PM
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I have a 5.4 and it's doin the same thing, but it only does this when it's cold, it seems to be comin from the induction system, anyone have any ideas. It is quite annoying!
 
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Old Dec 19, 2010 | 09:27 AM
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hopefully i have found the solution. i think its a dirty iac. heres a link of someone who had the same problem. IAC Cleaning Idle Air Control Maintenance


im going to try this and hopefully it'll work. if it doesn't i'll let you know
 
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Old Dec 19, 2010 | 09:30 AM
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Originally Posted by bullrider51
hopefully i have found the solution. i think its a dirty iac. heres a link of someone who had the same problem. IAC Cleaning Idle Air Control Maintenance


im going to try this and hopefully it'll work. if it doesn't i'll let you know
Best of luck to you but you should save your time. There is no IAC on these trucks its all drive by wire.
 
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Old Dec 19, 2010 | 12:10 PM
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Had the same noise was the alternator there was TBS on here a long time ago for 2004 had mine changed on extended warranty
 
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Old Dec 20, 2010 | 07:32 PM
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Is it coming from the left hand cowl grill? I remember from the past that this would make a noise at certain speeds.
 
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