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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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Old 10-21-2006
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Humming Noise

Okay I have a humming noise. That is the best way I can describe it. It almost sounds like a bus engine if you have heard them hum. The noise is always there it does change pitch with the rpms I don't think it is the tranny because it still happens in Neutral and Park. It is not the IAC valve I have heard this before and fixed it.

I noticed it on my way to work on tuesday. It could have been there monday but I don't know. Keep in mind that last saturday I was playing in mud (check avatar).
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Old 10-21-2006
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Torque converter?
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Old 10-22-2006
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Quote:
Originally Posted by milosch
Torque converter?

If this were the case would it still do it in Neutral and Park
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Old 10-22-2006
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i was gonna IAC but if youve already done that... i dont know..
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Old 10-23-2006
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humming bird?
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Old 10-23-2006
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What about the engine fan? The one on my truck gets pretty loud sometimes.
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Old 10-24-2006
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Quote:
Originally Posted by Gearhead61
What about the engine fan? The one on my truck gets pretty loud sometimes.
I was thinking this may be the culprit but why all of a sudden would it be loud I have had this truck 15 months and never heard a noise like this.


The noise did disapear monday on my way to work then when I was on my way home came back.
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Old 10-28-2006
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Okay so if the problem is torque converter how do I narrow this as the problem. I am going to say that it is not the fan although I guess I could be wrong since the sound could be the rushing of air.

Come on does anyone else know what could be causing this problem.
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Old 10-29-2006
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It's not a whine by your power steering/Air Condition pump/compressors? My 3.0 (yeah I know, competely different) whines and hums like it's turbo'd or supercharged . . . just some other things to think about.
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Old 10-29-2006
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its the idle speed motor.
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Old 10-29-2006
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Double check the IAC.
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Old 10-29-2006
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Quote:
Originally Posted by Ranger_Danger
It's not a whine by your power steering/Air Condition pump/compressors? My 3.0 (yeah I know, competely different) whines and hums like it's turbo'd or supercharged . . . just some other things to think about.
I guess this could be the problem is there anything I can do to fix this. Or should I just live with it. I don't enjoy hearing it and my last tank of gas was terrible I don't know if this is related or not but I am not happy with my truck right now.


It is not the IAC the noise is different than a hum from the IAC besides my IAC is practically brand new I replaced it less than 2 months ago.

What is the Idle Speed Motor???
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Old 10-29-2006
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its the silver motor with the black cap on the end.
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Old 10-29-2006
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My 98 hums pretty loud too when humidity and the temperature outiside are high. I've heard the same hum on explorers also. The hum only happens at idle. I've been told to replace the mass air flow sensor and that would fix it.
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