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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #1  
Old 08-04-2006
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whistle at low rpms

so ive been hearing a hich pitched whistle during accelerations at low rpms coming from the engine and i cant figure it out. its been doing it since january and its starting to get annoying. its not my intake, that make a different sound. thanks.
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  #2  
Old 08-04-2006
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You have an aftermarket intake right? Mike does it at certain throttle angle, Evans does it. Beards does it as well when he had it. If you are that worried about it then put stock airbox on and drive it.
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Old 08-04-2006
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yea its the intake probably, mine does the same thing, ive gotten used to it now...
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Old 08-04-2006
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It whistles at accel? If it does it at idle I would say it's the IAC. Whistling on acceleration would be IAC tho...
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Old 08-04-2006
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mine did it when i had an intake
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  #6  
Old 08-04-2006
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no the intake makes a different sound. this started happening way before i got my intake.
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  #7  
Old 08-04-2006
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Quote:
Originally Posted by Shalafi49
It whistles at accel? If it does it at idle I would say it's the IAC. Whistling on acceleration would be IAC tho...
bingo! There's your answer... does it sorta sound like a supercharger humming? if so, thats it... theres a way you can take it off and clean out the carbon deposits, but I just bought a new one...
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  #8  
Old 08-04-2006
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thats exactly what it sounds like. what is the IAC and where is it found, how much for a new one, and what does it do?
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Old 08-04-2006
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when my iac went.. it sounded almost like an electrical hum
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  #10  
Old 08-04-2006
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You have a SOHC and I have a OHV, so I'm not sure... my guess would be about the same place mine is... attached to the throttle body...
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  #11  
Old 08-04-2006
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what does it stand for and what does it do, look like? sorry for all the questions i just am not that familier with my engine yet.
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Old 08-04-2006
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man I need a new IAC too :(
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  #13  
Old 08-04-2006
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Idle Air Control

its a valve the controls the amout of allowed to enter for idle speed


You can try to clean it and relube it. The problem may go away.

New parts cost varies 50ish to 100, depending on vendor.
any parts house should have it or be able to get it
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  #14  
Old 08-04-2006
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thanks.
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  #15  
Old 08-05-2006
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Quote:
Originally Posted by Blhde
Idle Air Control

its a valve the controls the amout of allowed to enter for idle speed


You can try to clean it and relube it. The problem may go away.

New parts cost varies 50ish to 100, depending on vendor.
any parts house should have it or be able to get it

if you take off the SOHC cover you will see it. Its the grey thing on the intake just after the t-body.

i cleaned mine and it went away for a few weeks, but it came back.

may just wanna buy a new one
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  #16  
Old 08-05-2006
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sorry to jack this thread but, are intakes really worth it? i want to buy one soon and was wondering if you can tell the differance in HP?
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  #17  
Old 08-05-2006
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i got a better throttle response and maybe 2 or 3 more mpg if i kept the pedal off the floor.
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  #18  
Old 08-05-2006
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Quote:
Originally Posted by RangerBoy03FX4
i got a better throttle response and maybe 2 or 3 more mpg if i kept the pedal off the floor.
does that mean it was worth it?
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  #19  
Old 08-05-2006
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mine whistles too. it never did it until I put in the MAC intake. I think it sounds pretty neat lol
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  #20  
Old 08-05-2006
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Whistling under accel (unless its very light) isnt the IAC
If its doing it at idle too It might be the IAC.

When Mine went on my thunderbird it was extremely loud and sounded like a cross
between a cow and a whale.
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  #21  
Old 08-05-2006
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mine does it around 60ish and I can tell its in tube :)
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  #22  
Old 08-15-2006
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mine whistles also, I just think of it as my turbo. It doesn't bother me, but I do know it's there.
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  #23  
Old 08-15-2006
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Mine's done it since I removed my air silencer. but it's really not that loud at all.
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  #24  
Old 08-15-2006
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the iac sorta looks like this one, its on the right side of the throttle body (black cap off) when standing infront of the truck.

http://www.explorerforum.com/data/50..._black_cap.jpg
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