Weird noise..Diagnose - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 05-26-2008
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Weird noise..Diagnose

well its been happenig for a couple weeks i guess...At slow speeds like <40MPH...i can hear a whining noise...Its not the vac hose fo sho...I have my radio down and the windows..thats how i hear it....lol

It almost sounds electrical like a motor whining or soemthing, its not a sucking noise just a whining noise.....Anyone know whats up?
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Old 05-26-2008
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Sounds like the foo foo valve on it's way out.















I'm joking tho and have no clue.
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Old 05-27-2008
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The way you described it thats exactly what mine did it wined I went to the local ford dealership and they were able to figure out what it was I don't know exactly what the piece is called but its located right behind the throttle body and its connected to the intake manifold on the right side. I have a 4.0L so it should be the same in your engine.
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Old 05-27-2008
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well how much did it cost? and is it ok to leave alone or is it harmful??

Shane said he thought it was the alternator? i dont know though
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Old 05-27-2008
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I drove it around with it like that for about 4 months i don't think its harmful it didn't do any thing to my truck the part I got replaced was the idle control valve and it cost me $86.10 for a brand new one and the labor was $80.00 Go and see if that is the part that needs to be replaced.
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Old 05-27-2008
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Quote:
Originally Posted by cchsbuzz19 View Post
I drove it around with it like that for about 4 months i don't think its harmful it didn't do any thing to my truck the part I got replaced was the idle control valve and it cost me $86.10 for a brand new one and the labor was $80.00 Go and see if that is the part that needs to be replaced.
80 bucks in labor for an idle air control valve!?!?! It's a 3 minute job to replace that piece. They ripped you off big.

ranger_1999: does it only happen when the truck is moving and is less than 40 or does it happen at idle as well. Try to narrow down where the sound is coming from, that would be pretty helpful.
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Old 05-27-2008
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well when i first crank her up i cant hear it...it usually happens when i stop at a light. As soon as i stop i can hear a humming that is stable then it goes down or more quiet...I cant really hear it when it goes back down, but after i take back off i can tell it goes away completely
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Old 05-27-2008
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Its definately your IAC (Idle Air Control) Valve. Go to auto zone, napa etc and get one, quick and very easy fix.
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Old 05-28-2008
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okie dokey, is there a way to positivly check that...I guess take it off, and see if its stuck open, i had one bad on my 89 yota...The idle was insane, at a stop light i had to keep the clutch halfway let out b/c if it was in Nesutral it sound like i was revving 3500...lol
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Old 05-28-2008
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If you disconnect its electrical connector and the idle remains the same, it's bad.

FWIW, it could be working fine, just noisy.

You can also clean it. Might help the humm.
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Old 05-28-2008
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no no, the idle is not bad...
It sounds electrical, thats all i can say......Its ok, just wanted to see what it is. I'll disconnect the connector and see if it affects anything.....I guess itll be ok, ill have someone check it out at the meet saturday
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